# Functionality covered: this file contains a collection of tests for the # auto loading and namespaces. # # Sourcing this file into Tcl runs the tests and generates output for # errors. No output means no errors were found. # # Copyright (c) 1997 Sun Microsystems, Inc. # Copyright (c) 1998-1999 by Scriptics Corporation. # # See the file "license.terms" for information on usage and redistribution # of this file, and for a DISCLAIMER OF ALL WARRANTIES. # # RCS: @(#) $Id: init.test,v 1.6 2000/04/10 17:19:00 ericm Exp $ if {[lsearch [namespace children] ::tcltest] == -1} { package require tcltest namespace import -force ::tcltest::* } # Clear out any namespaces called test_ns_* catch {eval namespace delete [namespace children :: test_ns_*]} # Six cases - white box testing test init-1.1 {auto_qualify - absolute cmd - namespace} { auto_qualify ::foo::bar ::blue } ::foo::bar test init-1.2 {auto_qualify - absolute cmd - global} { auto_qualify ::global ::sub } global test init-1.3 {auto_qualify - no colons cmd - global} { auto_qualify nocolons :: } nocolons test init-1.4 {auto_qualify - no colons cmd - namespace} { auto_qualify nocolons ::sub } {::sub::nocolons nocolons} test init-1.5 {auto_qualify - colons in cmd - global} { auto_qualify foo::bar :: } ::foo::bar test init-1.6 {auto_qualify - colons in cmd - namespace} { auto_qualify foo::bar ::sub } {::sub::foo::bar ::foo::bar} # Some additional tests test init-1.7 {auto_qualify - multiples colons 1} { auto_qualify :::foo::::bar ::blue } ::foo::bar test init-1.8 {auto_qualify - multiple colons 2} { auto_qualify :::foo ::bar } foo # we use a sub interp and auto_reset and double the tests because there is 2 # places where auto_loading occur (before loading the indexes files and after) set testInterp [interp create] interp eval $testInterp [list set argv $argv] interp eval $testInterp [list package require tcltest] interp eval $testInterp [list namespace import -force ::tcltest::*] interp eval $testInterp { if {[lsearch [namespace children] ::tcltest] == -1} { package require tcltest } auto_reset catch {rename parray {}} test init-2.0 {load parray - stage 1} { set ret [catch {namespace eval ::tcltest {parray}} error] rename parray {} ; # remove it, for the next test - that should not fail. list $ret $error } {1 {no value given for parameter "a" to "parray"}} test init-2.1 {load parray - stage 2} { set ret [catch {namespace eval ::tcltest {parray}} error] list $ret $error } {1 {no value given for parameter "a" to "parray"}} auto_reset catch {rename ::safe::setLogCmd {}} #unset auto_index(::safe::setLogCmd) #unset auto_oldpath test init-2.2 {load ::safe::setLogCmd - stage 1} { ::safe::setLogCmd rename ::safe::setLogCmd {} ; # should not fail } {} test init-2.3 {load ::safe::setLogCmd - stage 2} { ::safe::setLogCmd rename ::safe::setLogCmd {} ; # should not fail } {} auto_reset catch {rename ::safe::setLogCmd {}} test init-2.4 {load safe:::setLogCmd - stage 1} { safe:::setLogCmd ; # intentionally 3 : rename ::safe::setLogCmd {} ; # should not fail } {} test init-2.5 {load safe:::setLogCmd - stage 2} { safe:::setLogCmd ; # intentionally 3 : rename ::safe::setLogCmd {} ; # should not fail } {} auto_reset catch {rename ::safe::setLogCmd {}} test init-2.6 {load setLogCmd from safe:: - stage 1} { namespace eval safe setLogCmd rename ::safe::setLogCmd {} ; # should not fail } {} test init-2.7 {oad setLogCmd from safe:: - stage 2} { namespace eval safe setLogCmd rename ::safe::setLogCmd {} ; # should not fail } {} auto_reset package require http 2.0 catch {rename ::http::geturl {}} test init-2.8 {load http::geturl (package)} { # 3 ':' on purpose set ret [catch {namespace eval ::tcltest {http:::geturl}} error] # removing it, for the next test. should not fail. rename ::http::geturl {} ; list $ret $error } {1 {no value given for parameter "url" to "http:::geturl"}} test init-3.0 {random stuff in the auto_index, should still work} { set auto_index(foo:::bar::blah) { namespace eval foo {namespace eval bar {proc blah {} {return 1}}} } foo:::bar::blah } 1 } # cleanup interp delete $testInterp ::tcltest::cleanupTests return id='n37' href='#n37'>37 38 39 40 41 42 43 44 45 46 47 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dnl ***************************************************
dnl * Please run autoreconf -if to test your changes! *
dnl ***************************************************
dnl
dnl Python's configure script requires autoconf 2.69 and autoconf-archive.
dnl

# Set VERSION so we only need to edit in one place (i.e., here)
m4_define(PYTHON_VERSION, 3.11)

AC_PREREQ([2.69])

AC_INIT([python],[PYTHON_VERSION],[https://bugs.python.org/])

m4_ifdef(
    [AX_C_FLOAT_WORDS_BIGENDIAN],
    [],
    [AC_MSG_ERROR([Please install autoconf-archive package and re-run autoreconf])]
)dnl
m4_ifdef(
    [PKG_PROG_PKG_CONFIG],
    [],
    [AC_MSG_ERROR([Please install pkgconf's m4 macro package and re-run autoreconf])]
)dnl

dnl Helpers for saving and restoring environment variables:
dnl - _SAVE_VAR([VAR])         Helper for SAVE_ENV; stores VAR as save_VAR
dnl - _RESTORE_VAR([VAR])      Helper for RESTORE_ENV; restores VAR from save_VAR
dnl - SAVE_ENV                 Saves CFLAGS, LDFLAGS, LIBS, and CPPFLAGS
dnl - RESTORE_ENV              Restores CFLAGS, LDFLAGS, LIBS, and CPPFLAGS
dnl - WITH_SAVE_ENV([SCRIPT])  Runs SCRIPT wrapped with SAVE_ENV/RESTORE_ENV
AC_DEFUN([_SAVE_VAR], [AS_VAR_COPY([save_][$1], [$1])])dnl
AC_DEFUN([_RESTORE_VAR], [AS_VAR_COPY([$1], [save_][$1])])dnl
AC_DEFUN([SAVE_ENV],
[_SAVE_VAR([CFLAGS])]
[_SAVE_VAR([CPPFLAGS])]
[_SAVE_VAR([LDFLAGS])]
[_SAVE_VAR([LIBS])]
)dnl
AC_DEFUN([RESTORE_ENV],
[_RESTORE_VAR([CFLAGS])]
[_RESTORE_VAR([CPPFLAGS])]
[_RESTORE_VAR([LDFLAGS])]
[_RESTORE_VAR([LIBS])]
)dnl
AC_DEFUN([WITH_SAVE_ENV],
[SAVE_ENV]
[$1]
[RESTORE_ENV]
)dnl

AC_SUBST(BASECPPFLAGS)
if test "$srcdir" != . -a "$srcdir" != "$(pwd)"; then
    # If we're building out-of-tree, we need to make sure the following
    # resources get picked up before their $srcdir counterparts.
    #   Objects/ -> typeslots.inc
    #   Include/ -> Python.h
    #   Python/  -> importlib.h
    # (A side effect of this is that these resources will automatically be
    #  regenerated when building out-of-tree, regardless of whether or not
    #  the $srcdir counterpart is up-to-date.  This is an acceptable trade
    #  off.)
    BASECPPFLAGS="-IObjects -IInclude -IPython"
else
    BASECPPFLAGS=""
fi

AC_SUBST(GITVERSION)
AC_SUBST(GITTAG)
AC_SUBST(GITBRANCH)

if test -e $srcdir/.git
then
AC_CHECK_PROG(HAS_GIT, git, found, not-found)
else
HAS_GIT=no-repository
fi
if test $HAS_GIT = found
then
    GITVERSION="git --git-dir \$(srcdir)/.git rev-parse --short HEAD"
    GITTAG="git --git-dir \$(srcdir)/.git describe --all --always --dirty"
    GITBRANCH="git --git-dir \$(srcdir)/.git name-rev --name-only HEAD"
else
    GITVERSION=""
    GITTAG=""
    GITBRANCH=""
fi

AC_CONFIG_SRCDIR([Include/object.h])
AC_CONFIG_HEADERS([pyconfig.h])

AC_CANONICAL_HOST
AC_SUBST(build)
AC_SUBST(host)

AS_VAR_IF([cross_compiling], [maybe],
 [AC_MSG_ERROR([Cross compiling required --host=HOST-TUPLE and --build=ARCH])]
)

# pybuilddir.txt will be created by --generate-posix-vars in the Makefile
rm -f pybuilddir.txt

AC_ARG_WITH(
  [build-python],
  [AS_HELP_STRING([--with-build-python=python]PYTHON_VERSION,
                  [path to build python binary for cross compiling (default: _bootstrap_python or python]PYTHON_VERSION[)])],
  [
    AC_MSG_CHECKING([for --with-build-python])

    AS_VAR_IF([with_build_python], [yes], [with_build_python=python$PACKAGE_VERSION])
    AS_VAR_IF([with_build_python], [no], [AC_MSG_ERROR([invalid --with-build-python option: expected path or "yes", not "no"])])

    if ! $(command -v "$with_build_python" >/dev/null 2>&1); then
      AC_MSG_ERROR([invalid or missing build python binary "$with_build_python"])
    fi
    build_python_ver=$($with_build_python -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')")
    if test "$build_python_ver" != "$PACKAGE_VERSION"; then
      AC_MSG_ERROR(["$with_build_python" has incompatible version $build_python_ver (expected: $PACKAGE_VERSION)])
    fi
    dnl Build Python interpreter is used for regeneration and freezing.
    ac_cv_prog_PYTHON_FOR_REGEN=$with_build_python
    PYTHON_FOR_FREEZE="$with_build_python"
    PYTHON_FOR_BUILD='_PYTHON_PROJECT_BASE=$(abs_builddir) _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(shell test -f pybuilddir.txt && echo $(abs_builddir)/`cat pybuilddir.txt`:)$(srcdir)/Lib _PYTHON_SYSCONFIGDATA_NAME=_sysconfigdata_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH) '$with_build_python
    AC_MSG_RESULT([$with_build_python])
  ], [
    AS_VAR_IF([cross_compiling], [yes],
      [AC_MSG_ERROR([Cross compiling requires --with-build-python])]
    )
    PYTHON_FOR_BUILD='./$(BUILDPYTHON) -E'
    PYTHON_FOR_FREEZE="./_bootstrap_python"
  ]
)
AC_SUBST([PYTHON_FOR_BUILD])

AC_MSG_CHECKING([for Python interpreter freezing])
AC_MSG_RESULT([$PYTHON_FOR_FREEZE])
AC_SUBST([PYTHON_FOR_FREEZE])

AS_VAR_IF([cross_compiling], [yes],
  [
    dnl external build Python, freezing depends on Programs/_freeze_module.py
    FREEZE_MODULE_BOOTSTRAP='$(PYTHON_FOR_FREEZE) $(srcdir)/Programs/_freeze_module.py'
    FREEZE_MODULE_BOOTSTRAP_DEPS='$(srcdir)/Programs/_freeze_module.py'
    FREEZE_MODULE='$(FREEZE_MODULE_BOOTSTRAP)'
    FREEZE_MODULE_DEPS='$(FREEZE_MODULE_BOOTSTRAP_DEPS)'
  ],
  [
    dnl internal build tools also depend on Programs/_freeze_module and _bootstrap_python.
    FREEZE_MODULE_BOOTSTRAP='./Programs/_freeze_module'
    FREEZE_MODULE_BOOTSTRAP_DEPS="Programs/_freeze_module"
    FREEZE_MODULE='$(PYTHON_FOR_FREEZE) $(srcdir)/Programs/_freeze_module.py'
    FREEZE_MODULE_DEPS="_bootstrap_python \$(srcdir)/Programs/_freeze_module.py"
  ]
)
AC_SUBST([FREEZE_MODULE_BOOTSTRAP])
AC_SUBST([FREEZE_MODULE_BOOTSTRAP_DEPS])
AC_SUBST([FREEZE_MODULE])
AC_SUBST([FREEZE_MODULE_DEPS])

AC_CHECK_PROGS([PYTHON_FOR_REGEN],
  [python$PACKAGE_VERSION python3.10 python3.9 python3.8 python3.7 python3.6 python3 python],
  [python3])
AC_SUBST(PYTHON_FOR_REGEN)

AC_MSG_CHECKING([Python for regen version])
if command -v "$PYTHON_FOR_REGEN" >/dev/null 2>&1; then
  AC_MSG_RESULT([$($PYTHON_FOR_REGEN -V 2>/dev/null)])
else
  AC_MSG_RESULT([missing])
fi

dnl Ensure that if prefix is specified, it does not end in a slash. If
dnl it does, we get path names containing '//' which is both ugly and
dnl can cause trouble.

dnl Last slash shouldn't be stripped if prefix=/
if test "$prefix" != "/"; then
    prefix=`echo "$prefix" | sed -e 's/\/$//g'`
fi

dnl This is for stuff that absolutely must end up in pyconfig.h.
dnl Please use pyport.h instead, if possible.
AH_TOP([
#ifndef Py_PYCONFIG_H
#define Py_PYCONFIG_H
])
AH_BOTTOM([
/* Define the macros needed if on a UnixWare 7.x system. */
#if defined(__USLC__) && defined(__SCO_VERSION__)
#define STRICT_SYSV_CURSES /* Don't use ncurses extensions */
#endif

#endif /*Py_PYCONFIG_H*/
])

# We don't use PACKAGE_ variables, and they cause conflicts
# with other autoconf-based packages that include Python.h
grep -v 'define PACKAGE_' <confdefs.h >confdefs.h.new
rm confdefs.h
mv confdefs.h.new confdefs.h

AC_SUBST(VERSION)
VERSION=PYTHON_VERSION

# Version number of Python's own shared library file.
AC_SUBST(SOVERSION)
SOVERSION=1.0

# The later definition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
# certain features on NetBSD, so we need _NETBSD_SOURCE to re-enable
# them.
AC_DEFINE(_NETBSD_SOURCE, 1, [Define on NetBSD to activate all library features])

# The later definition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
# certain features on FreeBSD, so we need __BSD_VISIBLE to re-enable
# them.
AC_DEFINE(__BSD_VISIBLE, 1, [Define on FreeBSD to activate all library features])

# The later definition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
# certain features on Mac OS X, so we need _DARWIN_C_SOURCE to re-enable
# them.
AC_DEFINE(_DARWIN_C_SOURCE, 1, [Define on Darwin to activate all library features])


define_xopen_source=yes

# Arguments passed to configure.
AC_SUBST(CONFIG_ARGS)
CONFIG_ARGS="$ac_configure_args"

dnl Allow users to disable pkg-config or require pkg-config
AC_ARG_WITH(
  [pkg-config],
  [AS_HELP_STRING([[--with-pkg-config=[yes|no|check]]],
                  [use pkg-config to detect build options (default is check)])],
  [],
  [with_pkg_config=check]
)
AS_CASE([$with_pkg_config],
  [yes|check], [
    if test -z "$PKG_CONFIG"; then
      dnl invalidate stale config.cache values
      AS_UNSET([PKG_CONFIG])
      AS_UNSET([ac_cv_path_ac_pt_PKG_CONFIG])
      AS_UNSET([ac_cv_prog_ac_ct_PKG_CONFIG])
    fi
    PKG_PROG_PKG_CONFIG
  ],
  [no], [
    PKG_CONFIG=''
    dnl force AX_CHECK_OPENSSL to ignore pkg-config
    ac_cv_path_ac_pt_PKG_CONFIG=''
    ac_cv_prog_ac_ct_PKG_CONFIG=''
  ],
  [AC_MSG_ERROR([invalid argument --with-pkg-config=$with_pkg_config])]
)
if test "$with_pkg_config" = yes -a -z "$PKG_CONFIG"; then
  AC_MSG_ERROR([pkg-config is required])]
fi

AC_MSG_CHECKING([for --enable-universalsdk])
AC_ARG_ENABLE(universalsdk,
	AS_HELP_STRING([--enable-universalsdk@<:@=SDKDIR@:>@],
	               [create a universal binary build.
	                SDKDIR specifies which macOS SDK should be used to perform the build,
	                see Mac/README.rst. (default is no)]),
[
	case $enableval in
	yes)
		# Locate the best usable SDK, see Mac/README for more
		# information
		enableval="`/usr/bin/xcodebuild -version -sdk macosx Path 2>/dev/null`"
		if ! ( echo $enableval | grep -E '\.sdk' 1>/dev/null )
		then
			enableval=/Developer/SDKs/MacOSX10.4u.sdk
			if test ! -d "${enableval}"
			then
				enableval=/
			fi
		fi
		;;
	esac
	case $enableval in
	no)
		UNIVERSALSDK=
		enable_universalsdk=
		;;
	*)
		UNIVERSALSDK=$enableval
		if test ! -d "${UNIVERSALSDK}"
		then
			AC_MSG_ERROR([--enable-universalsdk specifies non-existing SDK: ${UNIVERSALSDK}])
		fi
		;;
	esac

],[
   	UNIVERSALSDK=
	enable_universalsdk=
])
if test -n "${UNIVERSALSDK}"
then
	AC_MSG_RESULT(${UNIVERSALSDK})
else
	AC_MSG_RESULT(no)
fi
AC_SUBST(UNIVERSALSDK)

AC_SUBST(ARCH_RUN_32BIT)
ARCH_RUN_32BIT=""

# For backward compatibility reasons we prefer to select '32-bit' if available,
# otherwise use 'intel'
UNIVERSAL_ARCHS="32-bit"
if test "`uname -s`" = "Darwin"
then
	if test -n "${UNIVERSALSDK}"
	then
		if test -z "`/usr/bin/file -L "${UNIVERSALSDK}/usr/lib/libSystem.dylib" | grep ppc`"
		then
			UNIVERSAL_ARCHS="intel"
		fi
	fi
fi

AC_SUBST(LIPO_32BIT_FLAGS)
AC_SUBST(LIPO_INTEL64_FLAGS)
AC_MSG_CHECKING(for --with-universal-archs)
AC_ARG_WITH(universal-archs,
    AS_HELP_STRING([--with-universal-archs=ARCH],
                   [specify the kind of macOS universal binary that should be created.
                    This option is only valid when --enable-universalsdk is set; options are:
                    ("universal2", "intel-64", "intel-32", "intel", "32-bit",
                    "64-bit", "3-way", or "all")
                    see Mac/README.rst]),
[
	UNIVERSAL_ARCHS="$withval"
],
[])
if test -n "${UNIVERSALSDK}"
then
	AC_MSG_RESULT(${UNIVERSAL_ARCHS})
else
	AC_MSG_RESULT(no)
fi

AC_ARG_WITH(framework-name,
              AS_HELP_STRING([--with-framework-name=FRAMEWORK],
                             [specify the name for the python framework on macOS
                              only valid when --enable-framework is set. see Mac/README.rst
                              (default is 'Python')]),
[
    PYTHONFRAMEWORK=${withval}
    PYTHONFRAMEWORKDIR=${withval}.framework
    PYTHONFRAMEWORKIDENTIFIER=org.python.`echo $withval | tr '[A-Z]' '[a-z]'`
    ],[
    PYTHONFRAMEWORK=Python
    PYTHONFRAMEWORKDIR=Python.framework
    PYTHONFRAMEWORKIDENTIFIER=org.python.python
])
dnl quadrigraphs "@<:@" and "@:>@" produce "[" and "]" in the output
AC_ARG_ENABLE(framework,
              AS_HELP_STRING([--enable-framework@<:@=INSTALLDIR@:>@],
                             [create a Python.framework rather than a traditional Unix install.
                              optional INSTALLDIR specifies the installation path. see Mac/README.rst
                              (default is no)]),
[
	case $enableval in
	yes)
		enableval=/Library/Frameworks
	esac
	case $enableval in
	no)
		PYTHONFRAMEWORK=
		PYTHONFRAMEWORKDIR=no-framework
		PYTHONFRAMEWORKPREFIX=
		PYTHONFRAMEWORKINSTALLDIR=
		FRAMEWORKINSTALLFIRST=
		FRAMEWORKINSTALLLAST=
		FRAMEWORKALTINSTALLFIRST=
		FRAMEWORKALTINSTALLLAST=
		FRAMEWORKPYTHONW=
		if test "x${prefix}" = "xNONE"; then
			FRAMEWORKUNIXTOOLSPREFIX="${ac_default_prefix}"
		else
			FRAMEWORKUNIXTOOLSPREFIX="${prefix}"
		fi
		enable_framework=
		;;
	*)
		PYTHONFRAMEWORKPREFIX="${enableval}"
		PYTHONFRAMEWORKINSTALLDIR=$PYTHONFRAMEWORKPREFIX/$PYTHONFRAMEWORKDIR
		FRAMEWORKINSTALLFIRST="frameworkinstallstructure"
		FRAMEWORKALTINSTALLFIRST="frameworkinstallstructure "
		FRAMEWORKINSTALLLAST="frameworkinstallmaclib frameworkinstallapps frameworkinstallunixtools"
		FRAMEWORKALTINSTALLLAST="frameworkinstallmaclib frameworkinstallapps frameworkaltinstallunixtools"
		FRAMEWORKPYTHONW="frameworkpythonw"
		FRAMEWORKINSTALLAPPSPREFIX="/Applications"

		if test "x${prefix}" = "xNONE" ; then
			FRAMEWORKUNIXTOOLSPREFIX="${ac_default_prefix}"

		else
			FRAMEWORKUNIXTOOLSPREFIX="${prefix}"
		fi

		case "${enableval}" in
		/System*)
			FRAMEWORKINSTALLAPPSPREFIX="/Applications"
			if test "${prefix}" = "NONE" ; then
				# See below
				FRAMEWORKUNIXTOOLSPREFIX="/usr"
			fi
			;;

		/Library*)
			FRAMEWORKINSTALLAPPSPREFIX="/Applications"
			;;

		*/Library/Frameworks)
			MDIR="`dirname "${enableval}"`"
			MDIR="`dirname "${MDIR}"`"
			FRAMEWORKINSTALLAPPSPREFIX="${MDIR}/Applications"

			if test "${prefix}" = "NONE"; then
				# User hasn't specified the
				# --prefix option, but wants to install
				# the framework in a non-default location,
				# ensure that the compatibility links get
				# installed relative to that prefix as well
				# instead of in /usr/local.
				FRAMEWORKUNIXTOOLSPREFIX="${MDIR}"
			fi
			;;

		*)
			FRAMEWORKINSTALLAPPSPREFIX="/Applications"
			;;
		esac

		prefix=$PYTHONFRAMEWORKINSTALLDIR/Versions/$VERSION

		# Add files for Mac specific code to the list of output
		# files:
		AC_CONFIG_FILES(Mac/Makefile)
		AC_CONFIG_FILES(Mac/PythonLauncher/Makefile)
		AC_CONFIG_FILES(Mac/Resources/framework/Info.plist)
		AC_CONFIG_FILES(Mac/Resources/app/Info.plist)
	esac
	],[
	PYTHONFRAMEWORK=
	PYTHONFRAMEWORKDIR=no-framework
	PYTHONFRAMEWORKPREFIX=
	PYTHONFRAMEWORKINSTALLDIR=
	FRAMEWORKINSTALLFIRST=
	FRAMEWORKINSTALLLAST=
	FRAMEWORKALTINSTALLFIRST=
	FRAMEWORKALTINSTALLLAST=
	FRAMEWORKPYTHONW=
	if test "x${prefix}" = "xNONE" ; then
		FRAMEWORKUNIXTOOLSPREFIX="${ac_default_prefix}"
	else
		FRAMEWORKUNIXTOOLSPREFIX="${prefix}"
	fi
	enable_framework=

])
AC_SUBST(PYTHONFRAMEWORK)
AC_SUBST(PYTHONFRAMEWORKIDENTIFIER)
AC_SUBST(PYTHONFRAMEWORKDIR)
AC_SUBST(PYTHONFRAMEWORKPREFIX)
AC_SUBST(PYTHONFRAMEWORKINSTALLDIR)
AC_SUBST(FRAMEWORKINSTALLFIRST)
AC_SUBST(FRAMEWORKINSTALLLAST)
AC_SUBST(FRAMEWORKALTINSTALLFIRST)
AC_SUBST(FRAMEWORKALTINSTALLLAST)
AC_SUBST(FRAMEWORKPYTHONW)
AC_SUBST(FRAMEWORKUNIXTOOLSPREFIX)
AC_SUBST(FRAMEWORKINSTALLAPPSPREFIX)

AC_DEFINE_UNQUOTED(_PYTHONFRAMEWORK, "${PYTHONFRAMEWORK}", [framework name])

# Set name for machine-dependent library files
AC_ARG_VAR([MACHDEP], [name for machine-dependent library files])
AC_MSG_CHECKING(MACHDEP)
if test -z "$MACHDEP"
then
    # avoid using uname for cross builds
    if test "$cross_compiling" = yes; then
       # ac_sys_system and ac_sys_release are used for setting
       # a lot of different things including 'define_xopen_source'
       # in the case statement below.
	case "$host" in
	*-*-linux-android*)
		ac_sys_system=Linux-android
		;;
	*-*-linux*)
		ac_sys_system=Linux
		;;
	*-*-cygwin*)
		ac_sys_system=Cygwin
		;;
	*-*-vxworks*)
	    ac_sys_system=VxWorks
	    ;;
	*-*-emscripten)
	    ac_sys_system=Emscripten
	    ;;
	*-*-wasi)
	    ac_sys_system=WASI
	    ;;
	*)
		# for now, limit cross builds to known configurations
		MACHDEP="unknown"
		AC_MSG_ERROR([cross build not supported for $host])
	esac
	ac_sys_release=
    else
	ac_sys_system=`uname -s`
	if test "$ac_sys_system" = "AIX" \
	-o "$ac_sys_system" = "UnixWare" -o "$ac_sys_system" = "OpenUNIX"; then
		ac_sys_release=`uname -v`
	else
		ac_sys_release=`uname -r`
	fi
    fi
    ac_md_system=`echo $ac_sys_system |
			tr -d '[/ ]' | tr '[[A-Z]]' '[[a-z]]'`
    ac_md_release=`echo $ac_sys_release |
			tr -d '[/ ]' | sed 's/^[[A-Z]]\.//' | sed 's/\..*//'`
    MACHDEP="$ac_md_system$ac_md_release"

    case $MACHDEP in
	aix*) MACHDEP="aix";;
	linux*) MACHDEP="linux";;
	cygwin*) MACHDEP="cygwin";;
	darwin*) MACHDEP="darwin";;
	'')	MACHDEP="unknown";;
    esac
fi
AC_MSG_RESULT("$MACHDEP")

AC_SUBST(_PYTHON_HOST_PLATFORM)
if test "$cross_compiling" = yes; then
	case "$host" in
	*-*-linux*)
		case "$host_cpu" in
		arm*)
			_host_cpu=arm
			;;
		*)
			_host_cpu=$host_cpu
		esac
		;;
	*-*-cygwin*)
		_host_cpu=
		;;
	*-*-vxworks*)
		_host_cpu=$host_cpu
		;;
	wasm32-*-* | wasm64-*-*)
		_host_cpu=$host_cpu
		;;
	*)
		# for now, limit cross builds to known configurations
		MACHDEP="unknown"
		AC_MSG_ERROR([cross build not supported for $host])
	esac
	_PYTHON_HOST_PLATFORM="$MACHDEP${_host_cpu:+-$_host_cpu}"
fi

# Some systems cannot stand _XOPEN_SOURCE being defined at all; they
# disable features if it is defined, without any means to access these
# features as extensions. For these systems, we skip the definition of
# _XOPEN_SOURCE. Before adding a system to the list to gain access to
# some feature, make sure there is no alternative way to access this
# feature. Also, when using wildcards, make sure you have verified the
# need for not defining _XOPEN_SOURCE on all systems matching the
# wildcard, and that the wildcard does not include future systems
# (which may remove their limitations).
dnl quadrigraphs "@<:@" and "@:>@" produce "[" and "]" in the output
case $ac_sys_system/$ac_sys_release in
  # On OpenBSD, select(2) is not available if _XOPEN_SOURCE is defined,
  # even though select is a POSIX function. Reported by J. Ribbens.
  # Reconfirmed for OpenBSD 3.3 by Zachary Hamm, for 3.4 by Jason Ish.
  # In addition, Stefan Krah confirms that issue #1244610 exists through
  # OpenBSD 4.6, but is fixed in 4.7.
  OpenBSD/2.* | OpenBSD/3.* | OpenBSD/4.@<:@0123456@:>@)
    define_xopen_source=no
    # OpenBSD undoes our definition of __BSD_VISIBLE if _XOPEN_SOURCE is
    # also defined. This can be overridden by defining _BSD_SOURCE
    # As this has a different meaning on Linux, only define it on OpenBSD
    AC_DEFINE(_BSD_SOURCE, 1, [Define on OpenBSD to activate all library features])
    ;;
  OpenBSD/*)
    # OpenBSD undoes our definition of __BSD_VISIBLE if _XOPEN_SOURCE is
    # also defined. This can be overridden by defining _BSD_SOURCE
    # As this has a different meaning on Linux, only define it on OpenBSD
    AC_DEFINE(_BSD_SOURCE, 1, [Define on OpenBSD to activate all library features])
    ;;
  # Defining _XOPEN_SOURCE on NetBSD version prior to the introduction of
  # _NETBSD_SOURCE disables certain features (eg. setgroups). Reported by
  # Marc Recht
  NetBSD/1.5 | NetBSD/1.5.* | NetBSD/1.6 | NetBSD/1.6.* | NetBSD/1.6@<:@A-S@:>@)
    define_xopen_source=no;;
  # From the perspective of Solaris, _XOPEN_SOURCE is not so much a
  # request to enable features supported by the standard as a request
  # to disable features not supported by the standard.  The best way
  # for Python to use Solaris is simply to leave _XOPEN_SOURCE out
  # entirely and define __EXTENSIONS__ instead.
  SunOS/*)
    define_xopen_source=no;;
  # On UnixWare 7, u_long is never defined with _XOPEN_SOURCE,
  # but used in /usr/include/netinet/tcp.h. Reported by Tim Rice.
  # Reconfirmed for 7.1.4 by Martin v. Loewis.
  OpenUNIX/8.0.0| UnixWare/7.1.@<:@0-4@:>@)
    define_xopen_source=no;;
  # On OpenServer 5, u_short is never defined with _XOPEN_SOURCE,
  # but used in struct sockaddr.sa_family. Reported by Tim Rice.
  SCO_SV/3.2)
    define_xopen_source=no;;
  # On MacOS X 10.2, a bug in ncurses.h means that it craps out if
  # _XOPEN_EXTENDED_SOURCE is defined. Apparently, this is fixed in 10.3, which
  # identifies itself as Darwin/7.*
  # On Mac OS X 10.4, defining _POSIX_C_SOURCE or _XOPEN_SOURCE
  # disables platform specific features beyond repair.
  # On Mac OS X 10.3, defining _POSIX_C_SOURCE or _XOPEN_SOURCE
  # has no effect, don't bother defining them
  Darwin/@<:@6789@:>@.*)
    define_xopen_source=no;;
  Darwin/@<:@[12]@:>@@<:@0-9@:>@.*)
    define_xopen_source=no;;
  # On QNX 6.3.2, defining _XOPEN_SOURCE prevents netdb.h from
  # defining NI_NUMERICHOST.
  QNX/6.3.2)
    define_xopen_source=no
    ;;
  # On VxWorks, defining _XOPEN_SOURCE causes compile failures
  # in network headers still using system V types.
  VxWorks/*)
    define_xopen_source=no
    ;;

  # On HP-UX, defining _XOPEN_SOURCE to 600 or greater hides
  # chroot() and other functions
  hp*|HP*)
    define_xopen_source=no
    ;;

esac

if test $define_xopen_source = yes
then
  # X/Open 7, incorporating POSIX.1-2008
  AC_DEFINE(_XOPEN_SOURCE, 700,
            Define to the level of X/Open that your system supports)

  # On Tru64 Unix 4.0F, defining _XOPEN_SOURCE also requires
  # definition of _XOPEN_SOURCE_EXTENDED and _POSIX_C_SOURCE, or else
  # several APIs are not declared. Since this is also needed in some
  # cases for HP-UX, we define it globally.
  AC_DEFINE(_XOPEN_SOURCE_EXTENDED, 1,
   	    Define to activate Unix95-and-earlier features)

  AC_DEFINE(_POSIX_C_SOURCE, 200809L, Define to activate features from IEEE Stds 1003.1-2008)
fi

# On HP-UX mbstate_t requires _INCLUDE__STDC_A1_SOURCE
case $ac_sys_system in
  hp*|HP*)
    define_stdc_a1=yes;;
  *)
    define_stdc_a1=no;;
esac

if test $define_stdc_a1 = yes
then
  AC_DEFINE(_INCLUDE__STDC_A1_SOURCE, 1, Define to include mbstate_t for mbrtowc)
fi

# Record the configure-time value of MACOSX_DEPLOYMENT_TARGET,
# it may influence the way we can build extensions, so distutils
# needs to check it
AC_SUBST(CONFIGURE_MACOSX_DEPLOYMENT_TARGET)
AC_SUBST(EXPORT_MACOSX_DEPLOYMENT_TARGET)
CONFIGURE_MACOSX_DEPLOYMENT_TARGET=
EXPORT_MACOSX_DEPLOYMENT_TARGET='#'

# checks for alternative programs

# compiler flags are generated in two sets, BASECFLAGS and OPT.  OPT is just
# for debug/optimization stuff.  BASECFLAGS is for flags that are required
# just to get things to compile and link.  Users are free to override OPT
# when running configure or make.  The build should not break if they do.
# BASECFLAGS should generally not be messed with, however.

# If the user switches compilers, we can't believe the cache
if test ! -z "$ac_cv_prog_CC" -a ! -z "$CC" -a "$CC" != "$ac_cv_prog_CC"
then
  AC_MSG_ERROR([cached CC is different -- throw away $cache_file
(it is also a good idea to do 'make clean' before compiling)])
fi

# Don't let AC_PROG_CC set the default CFLAGS. It normally sets -g -O2
# when the compiler supports them, but we don't always want -O2, and
# we set -g later.
if test -z "$CFLAGS"; then
        CFLAGS=
fi

if test "$ac_sys_system" = "Darwin"
then
	# Compiler selection on MacOSX is more complicated than
	# AC_PROG_CC can handle, see Mac/README for more
	# information
	if test -z "${CC}"
	then
		found_gcc=
		found_clang=
		as_save_IFS=$IFS; IFS=:
		for as_dir in $PATH
		do
			IFS=$as_save_IFS
			if test -x "${as_dir}/gcc"; then
				if test -z "${found_gcc}"; then
					found_gcc="${as_dir}/gcc"
				fi
			fi
			if test -x "${as_dir}/clang"; then
				if test -z "${found_clang}"; then
					found_clang="${as_dir}/clang"
				fi
			fi
		done
		IFS=$as_save_IFS

		if test -n "$found_gcc" -a -n "$found_clang"
		then
			if test -n "`"$found_gcc" --version | grep llvm-gcc`"
			then
				AC_MSG_NOTICE([Detected llvm-gcc, falling back to clang])
				CC="$found_clang"
				CXX="$found_clang++"
			fi


		elif test -z "$found_gcc" -a -n "$found_clang"
		then
			AC_MSG_NOTICE([No GCC found, use CLANG])
			CC="$found_clang"
			CXX="$found_clang++"

		elif test -z "$found_gcc" -a -z "$found_clang"
		then
			found_clang=`/usr/bin/xcrun -find clang 2>/dev/null`
			if test -n "${found_clang}"
			then
				AC_MSG_NOTICE([Using clang from Xcode.app])
				CC="${found_clang}"
				CXX="`/usr/bin/xcrun -find clang++`"

			# else: use default behaviour
			fi
		fi
	fi
fi
AC_PROG_CC
AC_PROG_CPP
AC_PROG_GREP
AC_PROG_SED
AC_PROG_EGREP

# checks for UNIX variants that set C preprocessor variables
# may set _GNU_SOURCE, __EXTENSIONS__, _POSIX_PTHREAD_SEMANTICS,
# _POSIX_SOURCE, _POSIX_1_SOURCE, and more
AC_USE_SYSTEM_EXTENSIONS

AC_SUBST(CXX)
AC_SUBST(MAINCC)
AC_MSG_CHECKING(for --with-cxx-main=<compiler>)
AC_ARG_WITH(cxx_main,
            AS_HELP_STRING([--with-cxx-main@<:@=COMPILER@:>@],
                           [compile main() and link Python executable with C++ compiler specified in COMPILER (default is $CXX)]),
[

	case $withval in
	no)	with_cxx_main=no
		MAINCC='$(CC)';;
	yes)	with_cxx_main=yes
		MAINCC='$(CXX)';;
	*)	with_cxx_main=yes
		MAINCC=$withval
		if test -z "$CXX"
		then
			CXX=$withval
		fi;;
	esac], [
	with_cxx_main=no
	MAINCC='$(CC)'
])
AC_MSG_RESULT($with_cxx_main)

preset_cxx="$CXX"
if test -z "$CXX"
then
        case "$CC" in
        gcc)    AC_PATH_TOOL(CXX, [g++], [g++], [notfound]) ;;
        cc)     AC_PATH_TOOL(CXX, [c++], [c++], [notfound]) ;;
        clang|*/clang)     AC_PATH_TOOL(CXX, [clang++], [clang++], [notfound]) ;;
        icc|*/icc)         AC_PATH_TOOL(CXX, [icpc], [icpc], [notfound]) ;;
        esac
	if test "$CXX" = "notfound"
	then
		CXX=""
	fi
fi
if test -z "$CXX"
then
	AC_CHECK_TOOLS(CXX, $CCC c++ g++ gcc CC cxx cc++ cl, notfound)
	if test "$CXX" = "notfound"
	then
		CXX=""
	fi
fi
if test "$preset_cxx" != "$CXX"
then
        AC_MSG_NOTICE([

  By default, distutils will build C++ extension modules with "$CXX".
  If this is not intended, then set CXX on the configure command line.
  ])
fi


AC_MSG_CHECKING([for the platform triplet based on compiler characteristics])
cat >> conftest.c <<EOF
#undef bfin
#undef cris
#undef fr30
#undef linux
#undef hppa
#undef hpux
#undef i386
#undef mips
#undef powerpc
#undef sparc
#undef unix
#if defined(__ANDROID__)
    # Android is not a multiarch system.
#elif defined(__linux__)
# if defined(__x86_64__) && defined(__LP64__)
        x86_64-linux-gnu
# elif defined(__x86_64__) && defined(__ILP32__)
        x86_64-linux-gnux32
# elif defined(__i386__)
        i386-linux-gnu
# elif defined(__aarch64__) && defined(__AARCH64EL__)
#  if defined(__ILP32__)
        aarch64_ilp32-linux-gnu
#  else
        aarch64-linux-gnu
#  endif
# elif defined(__aarch64__) && defined(__AARCH64EB__)
#  if defined(__ILP32__)
        aarch64_be_ilp32-linux-gnu
#  else
        aarch64_be-linux-gnu
#  endif
# elif defined(__alpha__)
        alpha-linux-gnu
# elif defined(__ARM_EABI__) && defined(__ARM_PCS_VFP)
#  if defined(__ARMEL__)
        arm-linux-gnueabihf
#  else
        armeb-linux-gnueabihf
#  endif
# elif defined(__ARM_EABI__) && !defined(__ARM_PCS_VFP)
#  if defined(__ARMEL__)
        arm-linux-gnueabi
#  else
        armeb-linux-gnueabi
#  endif
# elif defined(__hppa__)
        hppa-linux-gnu
# elif defined(__ia64__)
        ia64-linux-gnu
# elif defined(__m68k__) && !defined(__mcoldfire__)
        m68k-linux-gnu
# elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6) && defined(_MIPSEL)
#  if _MIPS_SIM == _ABIO32
        mipsisa32r6el-linux-gnu
#  elif _MIPS_SIM == _ABIN32
        mipsisa64r6el-linux-gnuabin32
#  elif _MIPS_SIM == _ABI64
        mipsisa64r6el-linux-gnuabi64
#  else
#   error unknown platform triplet
#  endif
# elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6)
#  if _MIPS_SIM == _ABIO32
        mipsisa32r6-linux-gnu
#  elif _MIPS_SIM == _ABIN32
        mipsisa64r6-linux-gnuabin32
#  elif _MIPS_SIM == _ABI64
        mipsisa64r6-linux-gnuabi64
#  else
#   error unknown platform triplet
#  endif
# elif defined(__mips_hard_float) && defined(_MIPSEL)
#  if _MIPS_SIM == _ABIO32
        mipsel-linux-gnu
#  elif _MIPS_SIM == _ABIN32
        mips64el-linux-gnuabin32
#  elif _MIPS_SIM == _ABI64
        mips64el-linux-gnuabi64
#  else
#   error unknown platform triplet
#  endif
# elif defined(__mips_hard_float)
#  if _MIPS_SIM == _ABIO32
        mips-linux-gnu
#  elif _MIPS_SIM == _ABIN32
        mips64-linux-gnuabin32
#  elif _MIPS_SIM == _ABI64
        mips64-linux-gnuabi64
#  else
#   error unknown platform triplet
#  endif
# elif defined(__or1k__)
        or1k-linux-gnu
# elif defined(__powerpc__) && defined(__SPE__)
        powerpc-linux-gnuspe
# elif defined(__powerpc64__)
#  if defined(__LITTLE_ENDIAN__)
        powerpc64le-linux-gnu
#  else
        powerpc64-linux-gnu
#  endif
# elif defined(__powerpc__)
        powerpc-linux-gnu
# elif defined(__s390x__)
        s390x-linux-gnu
# elif defined(__s390__)
        s390-linux-gnu
# elif defined(__sh__) && defined(__LITTLE_ENDIAN__)
        sh4-linux-gnu
# elif defined(__sparc__) && defined(__arch64__)
        sparc64-linux-gnu
# elif defined(__sparc__)
        sparc-linux-gnu
# elif defined(__riscv)
#  if __riscv_xlen == 32
        riscv32-linux-gnu
#  elif __riscv_xlen == 64
        riscv64-linux-gnu
#  else
#   error unknown platform triplet
#  endif
# else
#   error unknown platform triplet
# endif
#elif defined(__FreeBSD_kernel__)
# if defined(__LP64__)
        x86_64-kfreebsd-gnu
# elif defined(__i386__)
        i386-kfreebsd-gnu
# else
#   error unknown platform triplet
# endif
#elif defined(__gnu_hurd__)
        i386-gnu
#elif defined(__APPLE__)
        darwin
#elif defined(__VXWORKS__)
        vxworks
#else
# error unknown platform triplet
#endif

EOF

if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
  PLATFORM_TRIPLET=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' 	'`
  AC_MSG_RESULT([$PLATFORM_TRIPLET])
else
  AC_MSG_RESULT([none])
fi
rm -f conftest.c conftest.out

if test x$PLATFORM_TRIPLET != xdarwin; then
  MULTIARCH=$($CC --print-multiarch 2>/dev/null)
fi
AC_SUBST(MULTIARCH)

if test x$PLATFORM_TRIPLET != x && test x$MULTIARCH != x; then
  if test x$PLATFORM_TRIPLET != x$MULTIARCH; then
    AC_MSG_ERROR([internal configure error for the platform triplet, please file a bug report])
  fi
elif test x$PLATFORM_TRIPLET != x && test x$MULTIARCH = x; then
  MULTIARCH=$PLATFORM_TRIPLET
fi
AC_SUBST(PLATFORM_TRIPLET)
if test x$MULTIARCH != x; then
  MULTIARCH_CPPFLAGS="-DMULTIARCH=\\\"$MULTIARCH\\\""
fi
AC_SUBST(MULTIARCH_CPPFLAGS)

AC_CACHE_CHECK([for -Wl,--no-as-needed], [ac_cv_wl_no_as_needed], [
  save_LDFLAGS="$LDFLAGS"
  AS_VAR_APPEND([LDFLAGS], [-Wl,--no-as-needed])
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
    [NO_AS_NEEDED="-Wl,--no-as-needed"
     ac_cv_wl_no_as_needed=yes],
    [NO_AS_NEEDED=""
     ac_cv_wl_no_as_needed=no])
  LDFLAGS="$save_LDFLAGS"
])
AC_SUBST(NO_AS_NEEDED)

AC_MSG_CHECKING([for the Android API level])
cat >> conftest.c <<EOF
#ifdef __ANDROID__
android_api = __ANDROID_API__
arm_arch = __ARM_ARCH
#else
#error not Android
#endif
EOF

if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
  ANDROID_API_LEVEL=`sed -n -e '/__ANDROID_API__/d' -e 's/^android_api = //p' conftest.out`
  _arm_arch=`sed -n -e '/__ARM_ARCH/d' -e 's/^arm_arch = //p' conftest.out`
  AC_MSG_RESULT([$ANDROID_API_LEVEL])
  if test -z "$ANDROID_API_LEVEL"; then
    AC_MSG_ERROR([Fatal: you must define __ANDROID_API__])
  fi
  AC_DEFINE_UNQUOTED(ANDROID_API_LEVEL, $ANDROID_API_LEVEL, [The Android API level.])

  AC_MSG_CHECKING([for the Android arm ABI])
  AC_MSG_RESULT([$_arm_arch])
  if test "$_arm_arch" = 7; then
    BASECFLAGS="${BASECFLAGS} -mfloat-abi=softfp -mfpu=vfpv3-d16"
    LDFLAGS="${LDFLAGS} -march=armv7-a -Wl,--fix-cortex-a8"
  fi
else
  AC_MSG_RESULT([not Android])
fi
rm -f conftest.c conftest.out

# Check for unsupported systems
AS_CASE([$ac_sys_system/$ac_sys_release],
  [atheos*|Linux*/1*], [
    AC_MSG_ERROR([m4_normalize([
      This system \($ac_sys_system/$ac_sys_release\) is no longer supported.
      See README for details.
   ])])
 ]
)

AC_MSG_CHECKING([for --with-suffix])
AC_ARG_WITH([suffix],
            [AS_HELP_STRING([--with-suffix=SUFFIX], [set executable suffix to SUFFIX (default is empty, yes is mapped to '.exe')])],
[
	AS_CASE([$with_suffix],
    [no], [EXEEXT=],
    [yes], [EXEEXT=.exe],
    [EXEEXT=$with_suffix]
  )
], [
  AS_CASE([$ac_sys_system],
    [Emscripten], [EXEEXT=.wasm],
    [EXEEXT=]
  )
])
AC_MSG_RESULT([$EXEEXT])

# Test whether we're running on a non-case-sensitive system, in which
# case we give a warning if no ext is given
AC_SUBST(BUILDEXEEXT)
AC_MSG_CHECKING(for case-insensitive build directory)
if test ! -d CaseSensitiveTestDir; then
mkdir CaseSensitiveTestDir
fi

if test -d casesensitivetestdir
then
    AC_MSG_RESULT(yes)
    BUILDEXEEXT=.exe
else
	AC_MSG_RESULT(no)
	BUILDEXEEXT=$EXEEXT
fi
rmdir CaseSensitiveTestDir

case $ac_sys_system in
hp*|HP*)
    case $CC in
    cc|*/cc) CC="$CC -Ae";;
    esac;;
esac

AC_SUBST(LIBRARY)
AC_MSG_CHECKING(LIBRARY)
if test -z "$LIBRARY"
then
	LIBRARY='libpython$(VERSION)$(ABIFLAGS).a'
fi
AC_MSG_RESULT($LIBRARY)

# LDLIBRARY is the name of the library to link against (as opposed to the
# name of the library into which to insert object files). BLDLIBRARY is also
# the library to link against, usually. On Mac OS X frameworks, BLDLIBRARY
# is blank as the main program is not linked directly against LDLIBRARY.
# LDLIBRARYDIR is the path to LDLIBRARY, which is made in a subdirectory. On
# systems without shared libraries, LDLIBRARY is the same as LIBRARY
# (defined in the Makefiles). On Cygwin LDLIBRARY is the import library,
# DLLLIBRARY is the shared (i.e., DLL) library.
#
# RUNSHARED is used to run shared python without installed libraries
#
# INSTSONAME is the name of the shared library that will be use to install
# on the system - some systems like version suffix, others don't
#
# LDVERSION is the shared library version number, normally the Python version
# with the ABI build flags appended.
AC_SUBST(LDLIBRARY)
AC_SUBST(DLLLIBRARY)
AC_SUBST(BLDLIBRARY)
AC_SUBST(PY3LIBRARY)
AC_SUBST(LDLIBRARYDIR)
AC_SUBST(INSTSONAME)
AC_SUBST(RUNSHARED)
AC_SUBST(LDVERSION)
LDLIBRARY="$LIBRARY"
BLDLIBRARY='$(LDLIBRARY)'
INSTSONAME='$(LDLIBRARY)'
DLLLIBRARY=''
LDLIBRARYDIR=''
RUNSHARED=''
LDVERSION="$VERSION"

# LINKCC is the command that links the python executable -- default is $(CC).
# If CXX is set, and if it is needed to link a main function that was
# compiled with CXX, LINKCC is CXX instead. Always using CXX is undesirable:
# python might then depend on the C++ runtime
AC_SUBST(LINKCC)
AC_MSG_CHECKING(LINKCC)
if test -z "$LINKCC"
then
	LINKCC='$(PURIFY) $(MAINCC)'
	case $ac_sys_system in
	QNX*)
	   # qcc must be used because the other compilers do not
	   # support -N.
	   LINKCC=qcc;;
	esac
fi
AC_MSG_RESULT($LINKCC)

# EXPORTSYMS holds the list of exported symbols for AIX.
# EXPORTSFROM holds the module name exporting symbols on AIX.
EXPORTSYMS=
EXPORTSFROM=
AC_SUBST(EXPORTSYMS)
AC_SUBST(EXPORTSFROM)
AC_MSG_CHECKING(EXPORTSYMS)
case $ac_sys_system in
AIX*)
	EXPORTSYMS="Modules/python.exp"
	EXPORTSFROM=. # the main executable
	;;
esac
AC_MSG_RESULT($EXPORTSYMS)

# GNULD is set to "yes" if the GNU linker is used.  If this goes wrong
# make sure we default having it set to "no": this is used by
# distutils.unixccompiler to know if it should add --enable-new-dtags
# to linker command lines, and failing to detect GNU ld simply results
# in the same bahaviour as before.
AC_SUBST(GNULD)
AC_MSG_CHECKING(for GNU ld)
ac_prog=ld
if test "$GCC" = yes; then
       ac_prog=`$CC -print-prog-name=ld`
fi
case `"$ac_prog" -V 2>&1 < /dev/null` in
      *GNU*)
          GNULD=yes;;
      *)
          GNULD=no;;
esac
AC_MSG_RESULT($GNULD)

AC_MSG_CHECKING(for --enable-shared)
AC_ARG_ENABLE(shared,
              AS_HELP_STRING([--enable-shared], [enable building a shared Python library (default is no)]))

if test -z "$enable_shared"
then
  case $ac_sys_system in
  CYGWIN*)
    enable_shared="yes";;
  *)
    enable_shared="no";;
  esac
fi
AC_MSG_RESULT($enable_shared)

AC_MSG_CHECKING(for --enable-profiling)
AC_ARG_ENABLE(profiling,
              AS_HELP_STRING([--enable-profiling], [enable C-level code profiling with gprof (default is no)]))
if test "x$enable_profiling" = xyes; then
  ac_save_cc="$CC"
  CC="$CC -pg"
  AC_LINK_IFELSE([AC_LANG_SOURCE([[int main() { return 0; }]])],
    [],
    [enable_profiling=no])
  CC="$ac_save_cc"
else
  enable_profiling=no
fi
AC_MSG_RESULT($enable_profiling)

if test "x$enable_profiling" = xyes; then
  BASECFLAGS="-pg $BASECFLAGS"
  LDFLAGS="-pg $LDFLAGS"
fi

AC_MSG_CHECKING(LDLIBRARY)

# MacOSX framework builds need more magic. LDLIBRARY is the dynamic
# library that we build, but we do not want to link against it (we
# will find it with a -framework option). For this reason there is an
# extra variable BLDLIBRARY against which Python and the extension
# modules are linked, BLDLIBRARY. This is normally the same as
# LDLIBRARY, but empty for MacOSX framework builds.
if test "$enable_framework"
then
  LDLIBRARY='$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
  RUNSHARED=DYLD_FRAMEWORK_PATH=`pwd`${DYLD_FRAMEWORK_PATH:+:${DYLD_FRAMEWORK_PATH}}
  BLDLIBRARY=''
else
  BLDLIBRARY='$(LDLIBRARY)'
fi

# Other platforms follow
if test $enable_shared = "yes"; then
  PY_ENABLE_SHARED=1
  AC_DEFINE(Py_ENABLE_SHARED, 1, [Defined if Python is built as a shared library.])
  case $ac_sys_system in
    CYGWIN*)
          LDLIBRARY='libpython$(LDVERSION).dll.a'
          DLLLIBRARY='libpython$(LDVERSION).dll'
          ;;
    SunOS*)
	  LDLIBRARY='libpython$(LDVERSION).so'
	  BLDLIBRARY='-Wl,-R,$(LIBDIR) -L. -lpython$(LDVERSION)'
	  RUNSHARED=LD_LIBRARY_PATH=`pwd`${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}
	  INSTSONAME="$LDLIBRARY".$SOVERSION
	  if test "$with_pydebug" != yes
	  then
	      PY3LIBRARY=libpython3.so
	  fi
          ;;
    Linux*|GNU*|NetBSD*|FreeBSD*|DragonFly*|OpenBSD*|VxWorks*)
	  LDLIBRARY='libpython$(LDVERSION).so'
	  BLDLIBRARY='-L. -lpython$(LDVERSION)'
	  RUNSHARED=LD_LIBRARY_PATH=`pwd`${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}
	  INSTSONAME="$LDLIBRARY".$SOVERSION
	  if test "$with_pydebug" != yes
          then
	      PY3LIBRARY=libpython3.so
	  fi
	  ;;
    hp*|HP*)
	  case `uname -m` in
		ia64)
			LDLIBRARY='libpython$(LDVERSION).so'
			;;
		*)
			LDLIBRARY='libpython$(LDVERSION).sl'
			;;
	  esac
	  BLDLIBRARY='-Wl,+b,$(LIBDIR) -L. -lpython$(LDVERSION)'
	  RUNSHARED=SHLIB_PATH=`pwd`${SHLIB_PATH:+:${SHLIB_PATH}}
	  ;;
    Darwin*)
    	LDLIBRARY='libpython$(LDVERSION).dylib'
	BLDLIBRARY='-L. -lpython$(LDVERSION)'
	RUNSHARED=DYLD_LIBRARY_PATH=`pwd`${DYLD_LIBRARY_PATH:+:${DYLD_LIBRARY_PATH}}
	;;
    AIX*)
	LDLIBRARY='libpython$(LDVERSION).so'
	RUNSHARED=LIBPATH=`pwd`${LIBPATH:+:${LIBPATH}}
	;;

  esac
else # shared is disabled
  PY_ENABLE_SHARED=0
  case $ac_sys_system in
    CYGWIN*)
          BLDLIBRARY='$(LIBRARY)'
          LDLIBRARY='libpython$(LDVERSION).dll.a'
          ;;
  esac
fi

if test "$cross_compiling" = yes; then
	RUNSHARED=
fi

AC_MSG_RESULT($LDLIBRARY)

AC_SUBST(AR)
AC_CHECK_TOOLS(AR, ar aal, ar)

# tweak ARFLAGS only if the user didn't set it on the command line
AC_SUBST(ARFLAGS)
if test -z "$ARFLAGS"
then
        ARFLAGS="rcs"
fi

AC_CHECK_TOOLS([READELF], [readelf], [:])
if test "$cross_compiling" = yes; then
    case "$READELF" in
	readelf|:)
	AC_MSG_ERROR([readelf for the host is required for cross builds])
	;;
    esac
fi
AC_SUBST(READELF)


case $MACHDEP in
hp*|HP*)
	# install -d does not work on HP-UX
	if test -z "$INSTALL"
	then
		INSTALL="${srcdir}/install-sh -c"
	fi
esac
AC_PROG_INSTALL
AC_PROG_MKDIR_P

# Not every filesystem supports hard links
AC_SUBST(LN)
if test -z "$LN" ; then
	case $ac_sys_system in
		CYGWIN*) LN="ln -s";;
		*) LN=ln;;
	esac
fi

# For calculating the .so ABI tag.
AC_SUBST(ABIFLAGS)
ABIFLAGS=""

# Check for --with-pydebug
AC_MSG_CHECKING(for --with-pydebug)
AC_ARG_WITH(pydebug,
            AS_HELP_STRING([--with-pydebug], [build with Py_DEBUG defined (default is no)]),
[
if test "$withval" != no
then
  AC_DEFINE(Py_DEBUG, 1,
  [Define if you want to build an interpreter with many run-time checks.])
  AC_MSG_RESULT(yes);
  Py_DEBUG='true'
  ABIFLAGS="${ABIFLAGS}d"
else AC_MSG_RESULT(no); Py_DEBUG='false'
fi],
[AC_MSG_RESULT(no)])

# Check for --with-trace-refs
# --with-trace-refs
AC_MSG_CHECKING(for --with-trace-refs)
AC_ARG_WITH(trace-refs,
  AS_HELP_STRING(
    [--with-trace-refs],
    [enable tracing references for debugging purpose (default is no)]),,
  with_trace_refs=no)
AC_MSG_RESULT($with_trace_refs)

if test "$with_trace_refs" = "yes"
then
  AC_DEFINE(Py_TRACE_REFS, 1, [Define if you want to enable tracing references for debugging purpose])
fi


# Check for --enable-pystats
AC_MSG_CHECKING([for --enable-pystats])
AC_ARG_ENABLE([pystats],
  [AS_HELP_STRING(
    [--enable-pystats],
    [enable internal statistics gathering (default is no)])],,
  [enable_pystats=no]
)
AC_MSG_RESULT([$enable_pystats])

AS_VAR_IF([enable_pystats], [yes], [
  AC_DEFINE([Py_STATS], [1], [Define if you want to enable internal statistics gathering.])
])

# Check for --with-assertions.
# This allows enabling assertions without Py_DEBUG.
assertions='false'
AC_MSG_CHECKING(for --with-assertions)
AC_ARG_WITH(assertions,
            AS_HELP_STRING([--with-assertions],[build with C assertions enabled (default is no)]),
[
if test "$withval" != no
then
  assertions='true'
fi],
[])
if test "$assertions" = 'true'; then
  AC_MSG_RESULT(yes)
elif test "$Py_DEBUG" = 'true'; then
  assertions='true'
  AC_MSG_RESULT(implied by --with-pydebug)
else
  AC_MSG_RESULT(no)
fi

# Enable optimization flags
AC_SUBST(DEF_MAKE_ALL_RULE)
AC_SUBST(DEF_MAKE_RULE)
Py_OPT='false'
AC_MSG_CHECKING(for --enable-optimizations)
AC_ARG_ENABLE(optimizations, AS_HELP_STRING(
                [--enable-optimizations],
                [enable expensive, stable optimizations (PGO, etc.) (default is no)]),
[
if test "$enableval" != no
then
  Py_OPT='true'
  AC_MSG_RESULT(yes);
else
  Py_OPT='false'
  AC_MSG_RESULT(no);
fi],
[AC_MSG_RESULT(no)])
if test "$Py_OPT" = 'true' ; then
  # Intentionally not forcing Py_LTO='true' here.  Too many toolchains do not
  # compile working code using it and both test_distutils and test_gdb are
  # broken when you do manage to get a toolchain that works with it.  People
  # who want LTO need to use --with-lto themselves.
  DEF_MAKE_ALL_RULE="profile-opt"
  REQUIRE_PGO="yes"
  DEF_MAKE_RULE="build_all"
  case $CC in
    *gcc*)
      AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
      CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
      LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
      ])
      ;;
  esac


else
  DEF_MAKE_ALL_RULE="build_all"
  REQUIRE_PGO="no"
  DEF_MAKE_RULE="all"
fi

AC_ARG_VAR(PROFILE_TASK, Python args for PGO generation task)
AC_MSG_CHECKING(PROFILE_TASK)
if test -z "$PROFILE_TASK"
then
	PROFILE_TASK='-m test --pgo --timeout=$(TESTTIMEOUT)'
fi
AC_MSG_RESULT($PROFILE_TASK)

# Make llvm-relatec checks work on systems where llvm tools are not installed with their
# normal names in the default $PATH (ie: Ubuntu).  They exist under the
# non-suffixed name in their versioned llvm directory.

llvm_bin_dir=''
llvm_path="${PATH}"
if test "${CC}" = "clang"
then
  clang_bin=`which clang`
  # Some systems install clang elsewhere as a symlink to the real path
  # which is where the related llvm tools are located.
  if test -L "${clang_bin}"
  then
    clang_dir=`dirname "${clang_bin}"`
    clang_bin=`readlink "${clang_bin}"`
    llvm_bin_dir="${clang_dir}/"`dirname "${clang_bin}"`
    llvm_path="${llvm_path}${PATH_SEPARATOR}${llvm_bin_dir}"
  fi
fi

# Enable LTO flags
AC_MSG_CHECKING(for --with-lto)
AC_ARG_WITH(lto, AS_HELP_STRING([--with-lto=@<:@full|thin|no|yes@:>@], [enable Link-Time-Optimization in any build (default is no)]),
[
case "$withval" in
    full)
        Py_LTO='true'
        Py_LTO_POLICY='full'
        AC_MSG_RESULT(yes)
        ;;
    thin)
        Py_LTO='true'
        Py_LTO_POLICY='thin'
        AC_MSG_RESULT(yes)
        ;;
    yes)
        Py_LTO='true'
        Py_LTO_POLICY='default'
        AC_MSG_RESULT(yes)
        ;;
    no)
        Py_LTO='false'
        AC_MSG_RESULT(no)
        ;;
    *)
        Py_LTO='false'
        AC_MSG_ERROR([unknown lto option: '$withval'])
        ;;
esac
],
[AC_MSG_RESULT(no)])
if test "$Py_LTO" = 'true' ; then
  case $CC in
    *clang*)
      dnl flag to disable lto during linking
      LDFLAGS_NOLTO="-fno-lto"
      AC_SUBST(LLVM_AR)
      AC_PATH_TOOL(LLVM_AR, llvm-ar, '', ${llvm_path})
      AC_SUBST(LLVM_AR_FOUND)
      if test -n "${LLVM_AR}" -a -x "${LLVM_AR}"
      then
        LLVM_AR_FOUND="found"
      else
        LLVM_AR_FOUND="not-found"
      fi
      if test "$ac_sys_system" = "Darwin" -a "${LLVM_AR_FOUND}" = "not-found"
      then
        # The Apple-supplied ar in Xcode or the Command Line Tools is apparently sufficient
        found_llvm_ar=`/usr/bin/xcrun -find ar 2>/dev/null`
        if test -n "${found_llvm_ar}"
        then
          LLVM_AR='/usr/bin/xcrun ar'
          LLVM_AR_FOUND=found
          AC_MSG_NOTICE([llvm-ar found via xcrun: ${LLVM_AR}])
        fi
      fi
      if test $LLVM_AR_FOUND = not-found
      then
        LLVM_PROFR_ERR=yes
        AC_MSG_ERROR([llvm-ar is required for a --with-lto build with clang but could not be found.])
      else
        LLVM_AR_ERR=no
      fi
      AR="${LLVM_AR}"
      case $ac_sys_system in
        Darwin*)
          # Any changes made here should be reflected in the GCC+Darwin case below
          if test $Py_LTO_POLICY = default
          then
            LTOFLAGS="-flto -Wl,-export_dynamic"
            LTOCFLAGS="-flto"
          else
            LTOFLAGS="-flto=${Py_LTO_POLICY} -Wl,-export_dynamic"
            LTOCFLAGS="-flto=${Py_LTO_POLICY}"
          fi
          ;;
        *)
          if test $Py_LTO_POLICY = default
          then
            LTOFLAGS="-flto"
          else
            LTOFLAGS="-flto=${Py_LTO_POLICY}"
          fi
          ;;
      esac
      ;;
    *gcc*)
      if test $Py_LTO_POLICY = thin
      then
        AC_MSG_ERROR([thin lto is not supported under gcc compiler.])
      fi
      dnl flag to disable lto during linking
      LDFLAGS_NOLTO="-fno-lto"
      case $ac_sys_system in
        Darwin*)
          LTOFLAGS="-flto -Wl,-export_dynamic"
          LTOCFLAGS="-flto"
          ;;
        *)
          LTOFLAGS="-flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none"
          ;;
      esac
      ;;
  esac

  if test "$ac_cv_prog_cc_g" = "yes"
  then
      # bpo-30345: Add -g to LDFLAGS when compiling with LTO
      # to get debug symbols.
      LTOFLAGS="$LTOFLAGS -g"
  fi

  CFLAGS_NODIST="$CFLAGS_NODIST ${LTOCFLAGS-$LTOFLAGS}"
  LDFLAGS_NODIST="$LDFLAGS_NODIST $LTOFLAGS"
fi

# Enable PGO flags.
AC_SUBST(PGO_PROF_GEN_FLAG)
AC_SUBST(PGO_PROF_USE_FLAG)
AC_SUBST(LLVM_PROF_MERGER)
AC_SUBST(LLVM_PROF_FILE)
AC_SUBST(LLVM_PROF_ERR)
AC_SUBST(LLVM_PROFDATA)
AC_PATH_TOOL(LLVM_PROFDATA, llvm-profdata, '', ${llvm_path})
AC_SUBST(LLVM_PROF_FOUND)
if test -n "${LLVM_PROFDATA}" -a -x "${LLVM_PROFDATA}"
then
  LLVM_PROF_FOUND="found"
else
  LLVM_PROF_FOUND="not-found"
fi
if test "$ac_sys_system" = "Darwin" -a "${LLVM_PROF_FOUND}" = "not-found"
then
  found_llvm_profdata=`/usr/bin/xcrun -find llvm-profdata 2>/dev/null`
  if test -n "${found_llvm_profdata}"
  then
    # llvm-profdata isn't directly in $PATH in some cases.
    # https://apple.stackexchange.com/questions/197053/
    LLVM_PROFDATA='/usr/bin/xcrun llvm-profdata'
    LLVM_PROF_FOUND=found
    AC_MSG_NOTICE([llvm-profdata found via xcrun: ${LLVM_PROFDATA}])
  fi
fi
LLVM_PROF_ERR=no
case $CC in
  *clang*)
    # Any changes made here should be reflected in the GCC+Darwin case below
    PGO_PROF_GEN_FLAG="-fprofile-instr-generate"
    PGO_PROF_USE_FLAG="-fprofile-instr-use=code.profclangd"
    LLVM_PROF_MERGER="${LLVM_PROFDATA} merge -output=code.profclangd *.profclangr"
    LLVM_PROF_FILE="LLVM_PROFILE_FILE=\"code-%p.profclangr\""
    if test $LLVM_PROF_FOUND = not-found
    then
      LLVM_PROF_ERR=yes
      if test "${REQUIRE_PGO}" = "yes"
      then
        AC_MSG_ERROR([llvm-profdata is required for a --enable-optimizations build but could not be found.])
      fi
    fi
    ;;
  *gcc*)
    case $ac_sys_system in
      Darwin*)
        PGO_PROF_GEN_FLAG="-fprofile-instr-generate"
        PGO_PROF_USE_FLAG="-fprofile-instr-use=code.profclangd"
        LLVM_PROF_MERGER="${LLVM_PROFDATA} merge -output=code.profclangd *.profclangr"
        LLVM_PROF_FILE="LLVM_PROFILE_FILE=\"code-%p.profclangr\""
        if test "${LLVM_PROF_FOUND}" = "not-found"
        then
          LLVM_PROF_ERR=yes
          if test "${REQUIRE_PGO}" = "yes"
	  then
	    AC_MSG_ERROR([llvm-profdata is required for a --enable-optimizations build but could not be found.])
	  fi
        fi
        ;;
      *)
        PGO_PROF_GEN_FLAG="-fprofile-generate"
        PGO_PROF_USE_FLAG="-fprofile-use -fprofile-correction"
        LLVM_PROF_MERGER="true"
        LLVM_PROF_FILE=""
        ;;
    esac
    ;;
  *icc*)
    PGO_PROF_GEN_FLAG="-prof-gen"
    PGO_PROF_USE_FLAG="-prof-use"
    LLVM_PROF_MERGER="true"
    LLVM_PROF_FILE=""
    ;;
esac

# XXX Shouldn't the code above that fiddles with BASECFLAGS and OPT be
# merged with this chunk of code?

# Optimizer/debugger flags
# ------------------------
# (The following bit of code is complicated enough - please keep things
# indented properly.  Just pretend you're editing Python code. ;-)

# There are two parallel sets of case statements below, one that checks to
# see if OPT was set and one that does BASECFLAGS setting based upon
# compiler and platform.  BASECFLAGS tweaks need to be made even if the
# user set OPT.

case $CC in
    *clang*)
        cc_is_clang=1
        ;;
    *)
        if $CC --version 2>&1 | grep -q clang
        then
            cc_is_clang=1
        else
            cc_is_clang=
        fi
esac

# tweak OPT based on compiler and platform, only if the user didn't set
# it on the command line
AC_SUBST(OPT)
AC_SUBST(CFLAGS_ALIASING)
if test "${OPT-unset}" = "unset"
then
    case $GCC in
    yes)
        # For gcc 4.x we need to use -fwrapv so lets check if its supported
        if "$CC" -v --help 2>/dev/null |grep -- -fwrapv > /dev/null; then
           WRAP="-fwrapv"
        fi

        if test -n "${cc_is_clang}"
        then
            # Clang also needs -fwrapv
            WRAP="-fwrapv"
            # bpo-30104: disable strict aliasing to compile correctly dtoa.c,
            # see Makefile.pre.in for more information
            CFLAGS_ALIASING="-fno-strict-aliasing"
        fi

	case $ac_cv_prog_cc_g in
	yes)
	    if test "$Py_DEBUG" = 'true' ; then
		# Optimization messes up debuggers, so turn it off for
		# debug builds.
                if "$CC" -v --help 2>/dev/null |grep -- -Og > /dev/null; then
                    OPT="-g -Og -Wall"
                else
                    OPT="-g -O0 -Wall"
                fi
	    else
		OPT="-g $WRAP -O3 -Wall"
	    fi
	    ;;
	*)
	    OPT="-O3 -Wall"
	    ;;
	esac

	case $ac_sys_system in
	    SCO_SV*) OPT="$OPT -m486 -DSCO5"
	    ;;
        esac
	;;

    *)
	OPT="-O"
	;;
    esac
fi

AC_SUBST(BASECFLAGS)
AC_SUBST(CFLAGS_NODIST)
AC_SUBST(LDFLAGS_NODIST)
AC_SUBST(LDFLAGS_NOLTO)

# The -arch flags for universal builds on macOS
UNIVERSAL_ARCH_FLAGS=
AC_SUBST(UNIVERSAL_ARCH_FLAGS)

dnl PY_CHECK_CC_WARNING(ENABLE, WARNING, [MSG])
AC_DEFUN([PY_CHECK_CC_WARNING], [
  AS_VAR_PUSHDEF([py_var], [ac_cv_$1_]m4_normalize($2)[_warning])
  AC_CACHE_CHECK(m4_ifblank([$3], [if we can $1 $CC $2 warning], [$3]), [py_var], [
    AS_VAR_COPY([py_cflags], [CFLAGS])
    AS_VAR_APPEND([CFLAGS], ["-W$2 -Werror"])
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
                      [AS_VAR_SET([py_var], [yes])],
                      [AS_VAR_SET([py_var], [no])])
    AS_VAR_COPY([CFLAGS], [py_cflags])
  ])
  AS_VAR_POPDEF([py_var])
])

# tweak BASECFLAGS based on compiler and platform
case $GCC in
yes)
    CFLAGS_NODIST="$CFLAGS_NODIST -std=c99"

    PY_CHECK_CC_WARNING([enable], [extra], [if we can add -Wextra])
    AS_VAR_IF([ac_cv_enable_extra_warning], [yes],
              [CFLAGS_NODIST="$CFLAGS_NODIST -Wextra"])

    # Python doesn't violate C99 aliasing rules, but older versions of
    # GCC produce warnings for legal Python code.  Enable
    # -fno-strict-aliasing on versions of GCC that support but produce
    # warnings.  See Issue3326
     ac_save_cc="$CC"
     CC="$CC -fno-strict-aliasing"
     save_CFLAGS="$CFLAGS"
     AC_CACHE_CHECK([whether $CC accepts and needs -fno-strict-aliasing],
                    [ac_cv_no_strict_aliasing],
       AC_COMPILE_IFELSE(
         [
	   AC_LANG_PROGRAM([[]], [[]])
	 ],[
	   CC="$ac_save_cc -fstrict-aliasing"
           CFLAGS="$CFLAGS -Werror -Wstrict-aliasing"
           AC_COMPILE_IFELSE(
	     [
	       AC_LANG_PROGRAM([[void f(int **x) {}]],
	         [[double *x; f((int **) &x);]])
	     ],[
	       ac_cv_no_strict_aliasing=no
	     ],[
               ac_cv_no_strict_aliasing=yes
	     ])
	 ],[
	   ac_cv_no_strict_aliasing=no
	 ]))
     CFLAGS="$save_CFLAGS"
     CC="$ac_save_cc"
    AS_VAR_IF([ac_cv_no_strict_aliasing], [yes],
              [BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"])

    # ICC doesn't recognize the option, but only emits a warning
    ## XXX does it emit an unused result warning and can it be disabled?
    AS_CASE([$CC],
            [*icc*], [ac_cv_disable_unused_result_warning=no]
            [PY_CHECK_CC_WARNING([disable], [unused-result])])
    AS_VAR_IF([ac_cv_disable_unused_result_warning], [yes],
              [BASECFLAGS="$BASECFLAGS -Wno-unused-result"
               CFLAGS_NODIST="$CFLAGS_NODIST -Wno-unused-result"])

    PY_CHECK_CC_WARNING([disable], [unused-parameter])
    AS_VAR_IF([ac_cv_disable_unused_parameter_warning], [yes],
              [CFLAGS_NODIST="$CFLAGS_NODIST -Wno-unused-parameter"])

    PY_CHECK_CC_WARNING([disable], [missing-field-initializers])
    AS_VAR_IF([ac_cv_disable_missing_field_initializers_warning], [yes],
              [CFLAGS_NODIST="$CFLAGS_NODIST -Wno-missing-field-initializers"])

    PY_CHECK_CC_WARNING([enable], [sign-compare])
    AS_VAR_IF([ac_cv_enable_sign_compare_warning], [yes],
              [BASECFLAGS="$BASECFLAGS -Wsign-compare"])

    PY_CHECK_CC_WARNING([enable], [unreachable-code])
    # Don't enable unreachable code warning in debug mode, since it usually
    # results in non-standard code paths.
    # Issue #24324: Unfortunately, the unreachable code warning does not work
    # correctly on gcc and has been silently removed from the compiler.
    # It is supported on clang but on OS X systems gcc may be an alias
    # for clang.  Try to determine if the compiler is not really gcc and,
    # if so, only then enable the warning.
    if test $ac_cv_enable_unreachable_code_warning = yes && \
        test "$Py_DEBUG" != "true" && \
        test -z "`$CC --version 2>/dev/null | grep 'Free Software Foundation'`"
    then
      BASECFLAGS="$BASECFLAGS -Wunreachable-code"
    else
      ac_cv_enable_unreachable_code_warning=no
    fi

    PY_CHECK_CC_WARNING([enable], [strict-prototypes])
    AS_VAR_IF([ac_cv_enable_strict_prototypes_warning], [yes],
              [CFLAGS_NODIST="$CFLAGS_NODIST -Wstrict-prototypes"])

     ac_save_cc="$CC"
     CC="$CC -Werror=implicit-function-declaration"
     AC_CACHE_CHECK([if we can make implicit function declaration an error in $CC],
                    [ac_cv_enable_implicit_function_declaration_error],
       AC_COMPILE_IFELSE(
         [
	   AC_LANG_PROGRAM([[]], [[]])
	 ],[
           ac_cv_enable_implicit_function_declaration_error=yes
	 ],[
           ac_cv_enable_implicit_function_declaration_error=no
	 ]))
     CC="$ac_save_cc"

    AS_VAR_IF([ac_cv_enable_implicit_function_declaration_error], [yes],
              [CFLAGS_NODIST="$CFLAGS_NODIST -Werror=implicit-function-declaration"])

     ac_save_cc="$CC"
     CC="$CC -fvisibility=hidden"
     AC_CACHE_CHECK([if we can use visibility in $CC], [ac_cv_enable_visibility],
       AC_COMPILE_IFELSE(
         [
	   AC_LANG_PROGRAM([[]], [[]])
	 ],[
           ac_cv_enable_visibility=yes
	 ],[
           ac_cv_enable_visibility=no
	 ]))
     CC="$ac_save_cc"

    AS_VAR_IF([ac_cv_enable_visibility], [yes],
              [CFLAGS_NODIST="$CFLAGS_NODIST -fvisibility=hidden"])

    # if using gcc on alpha, use -mieee to get (near) full IEEE 754
    # support.  Without this, treatment of subnormals doesn't follow
    # the standard.
    case $host in
         alpha*)
                BASECFLAGS="$BASECFLAGS -mieee"
                ;;
    esac

    case $ac_sys_system in
	SCO_SV*)
	    BASECFLAGS="$BASECFLAGS -m486 -DSCO5"
	    ;;

    Darwin*)
        # -Wno-long-double, -no-cpp-precomp, and -mno-fused-madd
        # used to be here, but non-Apple gcc doesn't accept them.
        if test "${CC}" = gcc
        then
            AC_MSG_CHECKING(which compiler should be used)
            case "${UNIVERSALSDK}" in
            */MacOSX10.4u.sdk)
                # Build using 10.4 SDK, force usage of gcc when the
                # compiler is gcc, otherwise the user will get very
                # confusing error messages when building on OSX 10.6
                CC=gcc-4.0
                CPP=cpp-4.0
                ;;
            esac
            AC_MSG_RESULT($CC)
        fi

        LIPO_INTEL64_FLAGS=""
        if test "${enable_universalsdk}"
        then
            case "$UNIVERSAL_ARCHS" in
            32-bit)
               UNIVERSAL_ARCH_FLAGS="-arch ppc -arch i386"
               LIPO_32BIT_FLAGS=""
               ARCH_RUN_32BIT=""
               ;;
            64-bit)
               UNIVERSAL_ARCH_FLAGS="-arch ppc64 -arch x86_64"
               LIPO_32BIT_FLAGS=""
               ARCH_RUN_32BIT="true"
               ;;
            all)
               UNIVERSAL_ARCH_FLAGS="-arch i386 -arch ppc -arch ppc64 -arch x86_64"
               LIPO_32BIT_FLAGS="-extract ppc7400 -extract i386"
               ARCH_RUN_32BIT="/usr/bin/arch -i386 -ppc"
               ;;
            universal2)
               UNIVERSAL_ARCH_FLAGS="-arch arm64 -arch x86_64"
               LIPO_32BIT_FLAGS=""
               LIPO_INTEL64_FLAGS="-extract x86_64"
               ARCH_RUN_32BIT="true"
               ;;
            intel)
               UNIVERSAL_ARCH_FLAGS="-arch i386 -arch x86_64"
               LIPO_32BIT_FLAGS="-extract i386"
               ARCH_RUN_32BIT="/usr/bin/arch -i386"
               ;;
            intel-32)
               UNIVERSAL_ARCH_FLAGS="-arch i386"
               LIPO_32BIT_FLAGS=""
               ARCH_RUN_32BIT=""
               ;;
            intel-64)
               UNIVERSAL_ARCH_FLAGS="-arch x86_64"
               LIPO_32BIT_FLAGS=""
               ARCH_RUN_32BIT="true"
               ;;
            3-way)
               UNIVERSAL_ARCH_FLAGS="-arch i386 -arch ppc -arch x86_64"
               LIPO_32BIT_FLAGS="-extract ppc7400 -extract i386"
               ARCH_RUN_32BIT="/usr/bin/arch -i386 -ppc"
               ;;
            *)
               AC_MSG_ERROR([proper usage is --with-universal-arch=universal2|32-bit|64-bit|all|intel|3-way])
               ;;
            esac

            if test "${UNIVERSALSDK}" != "/"
            then
                CFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${CFLAGS}"
                LDFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${LDFLAGS}"
                CPPFLAGS="-isysroot ${UNIVERSALSDK} ${CPPFLAGS}"
            else
                CFLAGS="${UNIVERSAL_ARCH_FLAGS} ${CFLAGS}"
                LDFLAGS="${UNIVERSAL_ARCH_FLAGS} ${LDFLAGS}"
            fi
        fi

        # Calculate an appropriate deployment target for this build:
        # The deployment target value is used explicitly to enable certain
        # features are enabled (such as builtin libedit support for readline)
        # through the use of Apple's Availability Macros and is used as a
        # component of the string returned by distutils.get_platform().
        #
        # Use the value from:
        # 1. the MACOSX_DEPLOYMENT_TARGET environment variable if specified
        # 2. the operating system version of the build machine if >= 10.6
        # 3. If running on OS X 10.3 through 10.5, use the legacy tests
        #       below to pick either 10.3, 10.4, or 10.5 as the target.
        # 4. If we are running on OS X 10.2 or earlier, good luck!

        AC_MSG_CHECKING(which MACOSX_DEPLOYMENT_TARGET to use)
        cur_target_major=`sw_vers -productVersion | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
        cur_target_minor=`sw_vers -productVersion | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
        cur_target="${cur_target_major}.${cur_target_minor}"
        if test ${cur_target_major} -eq 10 && \
           test ${cur_target_minor} -ge 3 && \
           test ${cur_target_minor} -le 5
        then
            # OS X 10.3 through 10.5
            cur_target=10.3
            if test ${enable_universalsdk}
            then
                case "$UNIVERSAL_ARCHS" in
                all|3-way|intel|64-bit)
                    # These configurations were first supported in 10.5
                    cur_target='10.5'
                    ;;
                esac
            else
                if test `/usr/bin/arch` = "i386"
                then
                    # 10.4 was the first release to support Intel archs
                    cur_target="10.4"
                fi
            fi
        fi
        CONFIGURE_MACOSX_DEPLOYMENT_TARGET=${MACOSX_DEPLOYMENT_TARGET-${cur_target}}

        # Make sure that MACOSX_DEPLOYMENT_TARGET is set in the
        # environment with a value that is the same as what we'll use
        # in the Makefile to ensure that we'll get the same compiler
        # environment during configure and build time.
        MACOSX_DEPLOYMENT_TARGET="$CONFIGURE_MACOSX_DEPLOYMENT_TARGET"
        export MACOSX_DEPLOYMENT_TARGET
        EXPORT_MACOSX_DEPLOYMENT_TARGET=''
        AC_MSG_RESULT($MACOSX_DEPLOYMENT_TARGET)

        AC_MSG_CHECKING(if specified universal architectures work)
        AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]], [[printf("%d", 42);]])],
            [AC_MSG_RESULT(yes)],
            [AC_MSG_RESULT(no)
             AC_MSG_ERROR(check config.log and use the '--with-universal-archs' option)
        ])

        # end of Darwin* tests
        ;;
    esac
    ;;

*)
    case $ac_sys_system in
    OpenUNIX*|UnixWare*)
	BASECFLAGS="$BASECFLAGS -K pentium,host,inline,loop_unroll,alloca "
	;;
    SCO_SV*)
	BASECFLAGS="$BASECFLAGS -belf -Ki486 -DSCO5"
	;;
    esac
    ;;
esac

case "$CC" in
*icc*)
    # ICC needs -fp-model strict or floats behave badly
    CFLAGS_NODIST="$CFLAGS_NODIST -fp-model strict"
    ;;
*xlc*)
    CFLAGS_NODIST="$CFLAGS_NODIST -qalias=noansi -qmaxmem=-1"
    ;;
esac

if test "$assertions" = 'true'; then
  :
else
  OPT="-DNDEBUG $OPT"
fi

if test "$ac_arch_flags"
then
	BASECFLAGS="$BASECFLAGS $ac_arch_flags"
fi

# On some compilers, pthreads are available without further options
# (e.g. MacOS X). On some of these systems, the compiler will not
# complain if unaccepted options are passed (e.g. gcc on Mac OS X).
# So we have to see first whether pthreads are available without
# options before we can check whether -Kpthread improves anything.
AC_CACHE_CHECK([whether pthreads are available without options],
               [ac_cv_pthread_is_default],
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <pthread.h>

void* routine(void* p){return NULL;}

int main(){
  pthread_t p;
  if(pthread_create(&p,NULL,routine,NULL)!=0)
    return 1;
  (void)pthread_detach(p);
  return 0;
}
]])],[
  ac_cv_pthread_is_default=yes
  ac_cv_kthread=no
  ac_cv_pthread=no
],[ac_cv_pthread_is_default=no],[ac_cv_pthread_is_default=no])
])


if test $ac_cv_pthread_is_default = yes
then
  ac_cv_kpthread=no
else
# -Kpthread, if available, provides the right #defines
# and linker options to make pthread_create available
# Some compilers won't report that they do not support -Kpthread,
# so we need to run a program to see whether it really made the
# function available.
AC_CACHE_CHECK([whether $CC accepts -Kpthread], [ac_cv_kpthread],
[ac_save_cc="$CC"
CC="$CC -Kpthread"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <pthread.h>

void* routine(void* p){return NULL;}

int main(){
  pthread_t p;
  if(pthread_create(&p,NULL,routine,NULL)!=0)
    return 1;
  (void)pthread_detach(p);
  return 0;
}
]])],[ac_cv_kpthread=yes],[ac_cv_kpthread=no],[ac_cv_kpthread=no])
CC="$ac_save_cc"])
fi

if test $ac_cv_kpthread = no -a $ac_cv_pthread_is_default = no
then
# -Kthread, if available, provides the right #defines
# and linker options to make pthread_create available
# Some compilers won't report that they do not support -Kthread,
# so we need to run a program to see whether it really made the
# function available.
AC_CACHE_CHECK([whether $CC accepts -Kthread], [ac_cv_kthread],
[ac_save_cc="$CC"
CC="$CC -Kthread"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <pthread.h>

void* routine(void* p){return NULL;}

int main(){
  pthread_t p;
  if(pthread_create(&p,NULL,routine,NULL)!=0)
    return 1;
  (void)pthread_detach(p);
  return 0;
}
]])],[ac_cv_kthread=yes],[ac_cv_kthread=no],[ac_cv_kthread=no])
CC="$ac_save_cc"])
fi

if test $ac_cv_kthread = no -a $ac_cv_pthread_is_default = no
then
# -pthread, if available, provides the right #defines
# and linker options to make pthread_create available
# Some compilers won't report that they do not support -pthread,
# so we need to run a program to see whether it really made the
# function available.
AC_CACHE_CHECK([whether $CC accepts -pthread], [ac_cv_pthread],
[ac_save_cc="$CC"
CC="$CC -pthread"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <pthread.h>

void* routine(void* p){return NULL;}

int main(){
  pthread_t p;
  if(pthread_create(&p,NULL,routine,NULL)!=0)
    return 1;
  (void)pthread_detach(p);
  return 0;
}
]])],[ac_cv_pthread=yes],[ac_cv_pthread=no],[ac_cv_pthread=no])
CC="$ac_save_cc"])
fi

# If we have set a CC compiler flag for thread support then
# check if it works for CXX, too.
ac_cv_cxx_thread=no
if test ! -z "$CXX"
then
AC_MSG_CHECKING(whether $CXX also accepts flags for thread support)
ac_save_cxx="$CXX"

if test "$ac_cv_kpthread" = "yes"
then
  CXX="$CXX -Kpthread"
  ac_cv_cxx_thread=yes
elif test "$ac_cv_kthread" = "yes"
then
  CXX="$CXX -Kthread"
  ac_cv_cxx_thread=yes
elif test "$ac_cv_pthread" = "yes"
then
  CXX="$CXX -pthread"
  ac_cv_cxx_thread=yes
fi

if test $ac_cv_cxx_thread = yes
then
  echo 'void foo();int main(){foo();}void foo(){}' > conftest.$ac_ext
  $CXX -c conftest.$ac_ext 2>&5
  if $CXX -o conftest$ac_exeext conftest.$ac_objext 2>&5 \
     && test -s conftest$ac_exeext && ./conftest$ac_exeext
  then
    ac_cv_cxx_thread=yes
  else
    ac_cv_cxx_thread=no
  fi
  rm -fr conftest*
fi
AC_MSG_RESULT($ac_cv_cxx_thread)
fi
CXX="$ac_save_cxx"

dnl # check for ANSI or K&R ("traditional") preprocessor
dnl AC_MSG_CHECKING(for C preprocessor type)
dnl AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
dnl #define spam(name, doc) {#name, &name, #name "() -- " doc}
dnl int foo;
dnl struct {char *name; int *addr; char *doc;} desc = spam(foo, "something");
dnl ]], [[;]])],[cpp_type=ansi],[AC_DEFINE(HAVE_OLD_CPP) cpp_type=traditional])
dnl AC_MSG_RESULT($cpp_type)

dnl autoconf 2.71 deprecates STDC_HEADERS, keep for backwards compatibility
dnl assume C99 compilers provide ANSI C headers
AC_DEFINE(STDC_HEADERS, 1, [Define to 1 if you have the ANSI C header files.])

# checks for header files
AC_CHECK_HEADERS([ \
  alloca.h asm/types.h bluetooth.h conio.h crypt.h direct.h dlfcn.h endian.h errno.h fcntl.h grp.h \
  ieeefp.h io.h langinfo.h libintl.h libutil.h linux/memfd.h linux/random.h linux/soundcard.h \
  linux/tipc.h linux/wait.h netinet/in.h netpacket/packet.h poll.h process.h pthread.h pty.h \
  sched.h shadow.h signal.h spawn.h stropts.h sys/audioio.h sys/bsdtty.h sys/devpoll.h \
  sys/endian.h sys/epoll.h sys/event.h sys/eventfd.h sys/file.h sys/ioctl.h sys/kern_control.h \
  sys/loadavg.h sys/lock.h sys/memfd.h sys/mkdev.h sys/mman.h sys/modem.h sys/param.h sys/poll.h \
  sys/random.h sys/resource.h sys/select.h sys/sendfile.h sys/socket.h sys/soundcard.h sys/stat.h \
  sys/statvfs.h sys/sys_domain.h sys/syscall.h sys/sysmacros.h sys/termio.h sys/time.h sys/times.h \
  sys/types.h sys/uio.h sys/un.h sys/utsname.h sys/wait.h sys/xattr.h sysexits.h syslog.h \
  termios.h util.h utime.h \
])
AC_HEADER_DIRENT
AC_HEADER_MAJOR

# bluetooth/bluetooth.h has been known to not compile with -std=c99.
# http://permalink.gmane.org/gmane.linux.bluez.kernel/22294
SAVE_CFLAGS=$CFLAGS
CFLAGS="-std=c99 $CFLAGS"
AC_CHECK_HEADERS(bluetooth/bluetooth.h)
CFLAGS=$SAVE_CFLAGS

# On Darwin (OS X) net/if.h requires sys/socket.h to be imported first.
AC_CHECK_HEADERS([net/if.h], [], [],
[#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
])

# On Linux, netlink.h requires asm/types.h
AC_CHECK_HEADERS(linux/netlink.h,,,[
#ifdef HAVE_ASM_TYPES_H
#include <asm/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])

# On Linux, qrtr.h requires asm/types.h
AC_CHECK_HEADERS(linux/qrtr.h,,,[
#ifdef HAVE_ASM_TYPES_H
#include <asm/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])

AC_CHECK_HEADERS(linux/vm_sockets.h,,,[
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])

# On Linux, can.h, can/bcm.h, can/j1939.h, can/raw.h require sys/socket.h
AC_CHECK_HEADERS(linux/can.h linux/can/bcm.h linux/can/j1939.h linux/can/raw.h,,,[
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])

# checks for typedefs
AC_CACHE_CHECK([for clock_t in time.h], [ac_cv_clock_t_time_h], [
  AC_EGREP_HEADER([clock_t], [time.h], [ac_cv_clock_t_time_h=yes], [ac_cv_clock_t_time_h=no])
])
dnl checks for "no"
AS_VAR_IF([ac_cv_clock_t_time_h], [no], [
  AC_DEFINE(clock_t, long, [Define to 'long' if <time.h> doesn't define.])
])

AC_CACHE_CHECK([for makedev], [ac_cv_func_makedev], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#if defined(MAJOR_IN_MKDEV)
#include <sys/mkdev.h>
#elif defined(MAJOR_IN_SYSMACROS)
#include <sys/sysmacros.h>
#else
#include <sys/types.h>
#endif
]], [[
  makedev(0, 0) ]])
],[ac_cv_func_makedev=yes],[ac_cv_func_makedev=no])
])

AS_VAR_IF([ac_cv_func_makedev], [yes], [
    AC_DEFINE(HAVE_MAKEDEV, 1, [Define this if you have the makedev macro.])
])

# byte swapping
AC_CACHE_CHECK([for le64toh], [ac_cv_func_le64toh], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#ifdef HAVE_ENDIAN_H
#include <endian.h>
#elif defined(HAVE_SYS_ENDIAN_H)
#include <sys/endian.h>
#endif
]], [[
   le64toh(1) ]])
],[ac_cv_func_le64toh=yes],[ac_cv_func_le64toh=no])
])

AS_VAR_IF([ac_cv_func_le64toh], [yes], [
    AC_DEFINE(HAVE_HTOLE64, 1, [Define this if you have le64toh()])
])

use_lfs=yes
# Don't use largefile support for GNU/Hurd
case $ac_sys_system in GNU*)
  use_lfs=no
esac

if test "$use_lfs" = "yes"; then
# Two defines needed to enable largefile support on various platforms
# These may affect some typedefs
case $ac_sys_system/$ac_sys_release in
AIX*)
    AC_DEFINE(_LARGE_FILES, 1,
    [This must be defined on AIX systems to enable large file support.])
    ;;
esac
AC_DEFINE(_LARGEFILE_SOURCE, 1,
[This must be defined on some systems to enable large file support.])
AC_DEFINE(_FILE_OFFSET_BITS, 64,
[This must be set to 64 on some systems to enable large file support.])
fi

# Add some code to confdefs.h so that the test for off_t works on SCO
cat >> confdefs.h <<\EOF
#if defined(SCO_DS)
#undef _OFF_T
#endif
EOF

# Type availability checks
AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_DEFINE_UNQUOTED([RETSIGTYPE],[void],[assume C89 semantics that RETSIGTYPE is always void])
AC_TYPE_SIZE_T
AC_TYPE_UID_T

AC_CHECK_TYPE(ssize_t,
  AC_DEFINE(HAVE_SSIZE_T, 1, [Define if your compiler provides ssize_t]),,)
AC_CHECK_TYPE(__uint128_t,
  AC_DEFINE(HAVE_GCC_UINT128_T, 1, [Define if your compiler provides __uint128_t]),,)

# Sizes and alignments of various common basic types
# ANSI C requires sizeof(char) == 1, so no need to check it
AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_ALIGNOF(long)
AC_CHECK_SIZEOF(long long, 8)
AC_CHECK_SIZEOF(void *, 4)
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(float, 4)
AC_CHECK_SIZEOF(double, 8)
AC_CHECK_SIZEOF(fpos_t, 4)
AC_CHECK_SIZEOF(size_t, 4)
AC_CHECK_ALIGNOF(size_t)
AC_CHECK_SIZEOF(pid_t, 4)
AC_CHECK_SIZEOF(uintptr_t)

AC_TYPE_LONG_DOUBLE
AC_CHECK_SIZEOF(long double, 16)

AC_CHECK_SIZEOF(_Bool, 1)

AC_CHECK_SIZEOF(off_t, [], [
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
])

AC_MSG_CHECKING(whether to enable large file support)
if test "$ac_cv_sizeof_off_t" -gt "$ac_cv_sizeof_long" -a \
	"$ac_cv_sizeof_long_long" -ge "$ac_cv_sizeof_off_t"; then
  AC_DEFINE(HAVE_LARGEFILE_SUPPORT, 1,
  [Defined to enable large file support when an off_t is bigger than a long
   and long long is at least as big as an off_t. You may need
   to add some flags for configuration and compilation to enable this mode.
   (For Solaris and Linux, the necessary defines are already defined.)])
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_CHECK_SIZEOF(time_t, [], [
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
])

# if have pthread_t then define SIZEOF_PTHREAD_T
ac_save_cc="$CC"
if test "$ac_cv_kpthread" = "yes"
then CC="$CC -Kpthread"
elif test "$ac_cv_kthread" = "yes"
then CC="$CC -Kthread"
elif test "$ac_cv_pthread" = "yes"
then CC="$CC -pthread"
fi

AC_CACHE_CHECK([for pthread_t], [ac_cv_have_pthread_t], [
AC_COMPILE_IFELSE([
  AC_LANG_PROGRAM([[#include <pthread.h>]], [[pthread_t x; x = *(pthread_t*)0;]])
], [ac_cv_have_pthread_t=yes], [ac_cv_have_pthread_t=no])
])
AS_VAR_IF([ac_cv_have_pthread_t], [yes], [
  AC_CHECK_SIZEOF(pthread_t, [], [
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
  ])
])

# Issue #25658: POSIX hasn't defined that pthread_key_t is compatible with int.
# This checking will be unnecessary after removing deprecated TLS API.
AC_CHECK_SIZEOF(pthread_key_t, [], [[#include <pthread.h>]])
AC_CACHE_CHECK([whether pthread_key_t is compatible with int], [ac_cv_pthread_key_t_is_arithmetic_type], [
if test "$ac_cv_sizeof_pthread_key_t" -eq "$ac_cv_sizeof_int" ; then
  AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[#include <pthread.h>]], [[pthread_key_t k; k * 1;]])],
    [ac_cv_pthread_key_t_is_arithmetic_type=yes],
    [ac_cv_pthread_key_t_is_arithmetic_type=no]
  )
else
  ac_cv_pthread_key_t_is_arithmetic_type=no
fi
])
AS_VAR_IF([ac_cv_pthread_key_t_is_arithmetic_type], [yes], [
    AC_DEFINE(PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT, 1,
              [Define if pthread_key_t is compatible with int.])
])

CC="$ac_save_cc"

AC_SUBST(OTHER_LIBTOOL_OPT)
case $ac_sys_system/$ac_sys_release in
  Darwin/@<:@01567@:>@\..*)
    OTHER_LIBTOOL_OPT="-prebind -seg1addr 0x10000000"
    ;;
  Darwin/*)
    OTHER_LIBTOOL_OPT=""
    ;;
esac


AC_SUBST(LIBTOOL_CRUFT)
case $ac_sys_system/$ac_sys_release in
  Darwin/@<:@01567@:>@\..*)
    LIBTOOL_CRUFT="-framework System -lcc_dynamic"
    if test "${enable_universalsdk}"; then
	    :
    else
        LIBTOOL_CRUFT="${LIBTOOL_CRUFT} -arch_only `/usr/bin/arch`"
    fi
    LIBTOOL_CRUFT=$LIBTOOL_CRUFT' -install_name $(PYTHONFRAMEWORKINSTALLDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
    LIBTOOL_CRUFT=$LIBTOOL_CRUFT' -compatibility_version $(VERSION) -current_version $(VERSION)';;
  Darwin/*)
    gcc_version=`gcc -dumpversion`
    if test ${gcc_version} '<' 4.0
        then
            LIBTOOL_CRUFT="-lcc_dynamic"
        else
            LIBTOOL_CRUFT=""
    fi
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
    #include <unistd.h>
    int main(int argc, char*argv[])
    {
      if (sizeof(long) == 4) {
    	  return 0;
      } else {
      	  return 1;
      }
    }
    ]])],[ac_osx_32bit=yes],[ac_osx_32bit=no],[ac_osx_32bit=yes])

    if test "${ac_osx_32bit}" = "yes"; then
    	case `/usr/bin/arch` in
    	i386)
    		MACOSX_DEFAULT_ARCH="i386"
    		;;
    	ppc)
    		MACOSX_DEFAULT_ARCH="ppc"
    		;;
    	*)
    		AC_MSG_ERROR([Unexpected output of 'arch' on macOS])
    		;;
    	esac
    else
    	case `/usr/bin/arch` in
    	i386)
    		MACOSX_DEFAULT_ARCH="x86_64"
    		;;
    	ppc)
    		MACOSX_DEFAULT_ARCH="ppc64"
		;;
    	arm64)
    		MACOSX_DEFAULT_ARCH="arm64"
    		;;
    	*)
    		AC_MSG_ERROR([Unexpected output of 'arch' on macOS])
    		;;
    	esac

    fi

    LIBTOOL_CRUFT=$LIBTOOL_CRUFT" -lSystem -lSystemStubs -arch_only ${MACOSX_DEFAULT_ARCH}"
    LIBTOOL_CRUFT=$LIBTOOL_CRUFT' -install_name $(PYTHONFRAMEWORKINSTALLDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
    LIBTOOL_CRUFT=$LIBTOOL_CRUFT' -compatibility_version $(VERSION) -current_version $(VERSION)';;
esac
AC_MSG_CHECKING(for --enable-framework)
if test "$enable_framework"
then
	BASECFLAGS="$BASECFLAGS -fno-common -dynamic"
	# -F. is needed to allow linking to the framework while
	# in the build location.
	AC_DEFINE(WITH_NEXT_FRAMEWORK, 1,
         [Define if you want to produce an OpenStep/Rhapsody framework
         (shared library plus accessory files).])
	AC_MSG_RESULT(yes)
	if test $enable_shared = "yes"
	then
		AC_MSG_ERROR([Specifying both --enable-shared and --enable-framework is not supported, use only --enable-framework instead])
	fi
else
	AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(for dyld)
case $ac_sys_system/$ac_sys_release in
  Darwin/*)
  	AC_DEFINE(WITH_DYLD, 1,
        [Define if you want to use the new-style (Openstep, Rhapsody, MacOS)
         dynamic linker (dyld) instead of the old-style (NextStep) dynamic
         linker (rld). Dyld is necessary to support frameworks.])
  	AC_MSG_RESULT(always on for Darwin)
  	;;
  *)
	AC_MSG_RESULT(no)
	;;
esac

AC_MSG_CHECKING(for --with-address-sanitizer)
AC_ARG_WITH(address_sanitizer,
            AS_HELP_STRING([--with-address-sanitizer],
                           [enable AddressSanitizer memory error detector, 'asan' (default is no)]),
[
AC_MSG_RESULT($withval)
BASECFLAGS="-fsanitize=address -fno-omit-frame-pointer $BASECFLAGS"
LDFLAGS="-fsanitize=address $LDFLAGS"
# ASan works by controlling memory allocation, our own malloc interferes.
with_pymalloc="no"
],
[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for --with-memory-sanitizer)
AC_ARG_WITH(memory_sanitizer,
            AS_HELP_STRING([--with-memory-sanitizer],
                           [enable MemorySanitizer allocation error detector, 'msan' (default is no)]),
[
AC_MSG_RESULT($withval)
AX_CHECK_COMPILE_FLAG([-fsanitize=memory],[
BASECFLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 -fno-omit-frame-pointer $BASECFLAGS"
LDFLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 $LDFLAGS"
],[AC_MSG_ERROR([The selected compiler doesn't support memory sanitizer])])
# MSan works by controlling memory allocation, our own malloc interferes.
with_pymalloc="no"
],
[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for --with-undefined-behavior-sanitizer)
AC_ARG_WITH(undefined_behavior_sanitizer,
            AS_HELP_STRING([--with-undefined-behavior-sanitizer],
                           [enable UndefinedBehaviorSanitizer undefined behaviour detector, 'ubsan' (default is no)]),
[
AC_MSG_RESULT($withval)
BASECFLAGS="-fsanitize=undefined $BASECFLAGS"
LDFLAGS="-fsanitize=undefined $LDFLAGS"
with_ubsan="yes"
],
[
AC_MSG_RESULT(no)
with_ubsan="no"
])

# Set info about shared libraries.
AC_SUBST(SHLIB_SUFFIX)
AC_SUBST(LDSHARED)
AC_SUBST(LDCXXSHARED)
AC_SUBST(BLDSHARED)
AC_SUBST(CCSHARED)
AC_SUBST(LINKFORSHARED)

# SHLIB_SUFFIX is the extension of shared libraries `(including the dot!)
# -- usually .so, .sl on HP-UX, .dll on Cygwin
AC_MSG_CHECKING(the extension of shared libraries)
if test -z "$SHLIB_SUFFIX"; then
	case $ac_sys_system in
	hp*|HP*)
		case `uname -m` in
			ia64) SHLIB_SUFFIX=.so;;
	  		*)    SHLIB_SUFFIX=.sl;;
		esac
		;;
	CYGWIN*)   SHLIB_SUFFIX=.dll;;
	*)	   SHLIB_SUFFIX=.so;;
	esac
fi
AC_MSG_RESULT($SHLIB_SUFFIX)

# LDSHARED is the ld *command* used to create shared library
# -- "cc -G" on SunOS 5.x.
# (Shared libraries in this instance are shared modules to be loaded into
# Python, as opposed to building Python itself as a shared library.)
AC_MSG_CHECKING(LDSHARED)
if test -z "$LDSHARED"
then
	case $ac_sys_system/$ac_sys_release in
	AIX*)
		BLDSHARED="Modules/ld_so_aix \$(CC) -bI:Modules/python.exp"
		LDSHARED="\$(LIBPL)/ld_so_aix \$(CC) -bI:\$(LIBPL)/python.exp"
		;;
	SunOS/5*)
		if test "$GCC" = "yes" ; then
			LDSHARED='$(CC) -shared'
			LDCXXSHARED='$(CXX) -shared'
		else
			LDSHARED='$(CC) -G'
			LDCXXSHARED='$(CXX) -G'
		fi ;;
	hp*|HP*)
		if test "$GCC" = "yes" ; then
			LDSHARED='$(CC) -shared'
			LDCXXSHARED='$(CXX) -shared'
		else
			LDSHARED='$(CC) -b'
			LDCXXSHARED='$(CXX) -b'
		fi ;;
	Darwin/1.3*)
		LDSHARED='$(CC) -bundle'
		LDCXXSHARED='$(CXX) -bundle'
		if test "$enable_framework" ; then
			# Link against the framework. All externals should be defined.
			BLDSHARED="$LDSHARED "'$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
			LDSHARED="$LDSHARED "'$(PYTHONFRAMEWORKPREFIX)/$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
			LDCXXSHARED="$LDCXXSHARED "'$(PYTHONFRAMEWORKPREFIX)/$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
		else
			# No framework. Ignore undefined symbols, assuming they come from Python
			LDSHARED="$LDSHARED -undefined suppress"
			LDCXXSHARED="$LDCXXSHARED -undefined suppress"
		fi ;;
	Darwin/1.4*|Darwin/5.*|Darwin/6.*)
		LDSHARED='$(CC) -bundle'
		LDCXXSHARED='$(CXX) -bundle'
		if test "$enable_framework" ; then
			# Link against the framework. All externals should be defined.
			BLDSHARED="$LDSHARED "'$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
			LDSHARED="$LDSHARED "'$(PYTHONFRAMEWORKPREFIX)/$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
			LDCXXSHARED="$LDCXXSHARED "'$(PYTHONFRAMEWORKPREFIX)/$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
		else
			# No framework, use the Python app as bundle-loader
			BLDSHARED="$LDSHARED "'-bundle_loader $(BUILDPYTHON)'
			LDSHARED="$LDSHARED "'-bundle_loader $(BINDIR)/python$(VERSION)$(EXE)'
			LDCXXSHARED="$LDCXXSHARED "'-bundle_loader $(BINDIR)/python$(VERSION)$(EXE)'
		fi ;;
	Darwin/*)
		# Use -undefined dynamic_lookup whenever possible (10.3 and later).
		# This allows an extension to be used in any Python

		dep_target_major=`echo ${MACOSX_DEPLOYMENT_TARGET} | \
				sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
		dep_target_minor=`echo ${MACOSX_DEPLOYMENT_TARGET} | \
				sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
		if test ${dep_target_major} -eq 10 && \
		   test ${dep_target_minor} -le 2
		then
			# building for OS X 10.0 through 10.2
			AC_MSG_ERROR([MACOSX_DEPLOYMENT_TARGET too old ($MACOSX_DEPLOYMENT_TARGET), only 10.3 or later is supported])
		else
			# building for OS X 10.3 and later
			LDSHARED='$(CC) -bundle -undefined dynamic_lookup'
			LDCXXSHARED='$(CXX) -bundle -undefined dynamic_lookup'
			BLDSHARED="$LDSHARED"
		fi
		;;
	Linux*|GNU*|QNX*|VxWorks*|Haiku*)
		LDSHARED='$(CC) -shared'
		LDCXXSHARED='$(CXX) -shared';;
	FreeBSD*)
		if [[ "`$CC -dM -E - </dev/null | grep __ELF__`" != "" ]]
		then
			LDSHARED='$(CC) -shared'
			LDCXXSHARED='$(CXX) -shared'
		else
			LDSHARED="ld -Bshareable"
		fi;;
	OpenBSD*)
		if [[ "`$CC -dM -E - </dev/null | grep __ELF__`" != "" ]]
		then
				LDSHARED='$(CC) -shared $(CCSHARED)'
				LDCXXSHARED='$(CXX) -shared $(CCSHARED)'
		else
				case `uname -r` in
				[[01]].* | 2.[[0-7]] | 2.[[0-7]].*)
				   LDSHARED="ld -Bshareable ${LDFLAGS}"
				   ;;
				*)
				   LDSHARED='$(CC) -shared $(CCSHARED)'
				   LDCXXSHARED='$(CXX) -shared $(CCSHARED)'
				   ;;
				esac
		fi;;
	NetBSD*|DragonFly*)
		LDSHARED='$(CC) -shared'
		LDCXXSHARED='$(CXX) -shared';;
	OpenUNIX*|UnixWare*)
		if test "$GCC" = "yes" ; then
			LDSHARED='$(CC) -shared'
			LDCXXSHARED='$(CXX) -shared'
		else
			LDSHARED='$(CC) -G'
			LDCXXSHARED='$(CXX) -G'
		fi;;
	SCO_SV*)
		LDSHARED='$(CC) -Wl,-G,-Bexport'
		LDCXXSHARED='$(CXX) -Wl,-G,-Bexport';;
	CYGWIN*)
		LDSHARED="gcc -shared -Wl,--enable-auto-image-base"
		LDCXXSHARED="g++ -shared -Wl,--enable-auto-image-base";;
	*)	LDSHARED="ld";;
	esac
fi
AC_MSG_RESULT($LDSHARED)
LDCXXSHARED=${LDCXXSHARED-$LDSHARED}
BLDSHARED=${BLDSHARED-$LDSHARED}
# CCSHARED are the C *flags* used to create objects to go into a shared
# library (module) -- this is only needed for a few systems
AC_MSG_CHECKING(CCSHARED)
if test -z "$CCSHARED"
then
	case $ac_sys_system/$ac_sys_release in
	SunOS*) if test "$GCC" = yes;
		then CCSHARED="-fPIC";
		elif test `uname -p` = sparc;
		then CCSHARED="-xcode=pic32";
		else CCSHARED="-Kpic";
		fi;;
	hp*|HP*) if test "$GCC" = yes;
		 then CCSHARED="-fPIC";
		 else CCSHARED="+z";
		 fi;;
	Linux-android*) ;;
	Linux*|GNU*) CCSHARED="-fPIC";;
	FreeBSD*|NetBSD*|OpenBSD*|DragonFly*) CCSHARED="-fPIC";;
	Haiku*) CCSHARED="-fPIC";;
	OpenUNIX*|UnixWare*)
		if test "$GCC" = "yes"
		then CCSHARED="-fPIC"
		else CCSHARED="-KPIC"
		fi;;
	SCO_SV*)
		if test "$GCC" = "yes"
		then CCSHARED="-fPIC"
		else CCSHARED="-Kpic -belf"
		fi;;
	VxWorks*)
		CCSHARED="-fpic -D__SO_PICABILINUX__  -ftls-model=global-dynamic"
	esac
fi
AC_MSG_RESULT($CCSHARED)
# LINKFORSHARED are the flags passed to the $(CC) command that links
# the python executable -- this is only needed for a few systems
AC_MSG_CHECKING(LINKFORSHARED)
if test -z "$LINKFORSHARED"
then
	case $ac_sys_system/$ac_sys_release in
	AIX*)	LINKFORSHARED='-Wl,-bE:Modules/python.exp -lld';;
	hp*|HP*)
	    LINKFORSHARED="-Wl,-E -Wl,+s";;
#	    LINKFORSHARED="-Wl,-E -Wl,+s -Wl,+b\$(BINLIBDEST)/lib-dynload";;
	Linux-android*) LINKFORSHARED="-pie -Xlinker -export-dynamic";;
	Linux*|GNU*) LINKFORSHARED="-Xlinker -export-dynamic";;
	# -u libsys_s pulls in all symbols in libsys
	Darwin/*)
		LINKFORSHARED="$extra_undefs -framework CoreFoundation"

		# Issue #18075: the default maximum stack size (8MBytes) is too
		# small for the default recursion limit. Increase the stack size
		# to ensure that tests don't crash
    stack_size="1000000"  # 16 MB
    if test "$with_ubsan" == "yes"
    then
        # Undefined behavior sanitizer requires an even deeper stack
        stack_size="4000000"  # 64 MB
    fi

    LINKFORSHARED="-Wl,-stack_size,$stack_size $LINKFORSHARED"

    AC_DEFINE_UNQUOTED(THREAD_STACK_SIZE,
        0x$stack_size,
        [Custom thread stack size depending on chosen sanitizer runtimes.])

		if test "$enable_framework"
		then
			LINKFORSHARED="$LINKFORSHARED "'$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
		fi
		LINKFORSHARED="$LINKFORSHARED";;
	OpenUNIX*|UnixWare*) LINKFORSHARED="-Wl,-Bexport";;
	SCO_SV*) LINKFORSHARED="-Wl,-Bexport";;
	ReliantUNIX*) LINKFORSHARED="-W1 -Blargedynsym";;
	FreeBSD*|NetBSD*|OpenBSD*|DragonFly*)
		if [[ "`$CC -dM -E - </dev/null | grep __ELF__`" != "" ]]
		then
			LINKFORSHARED="-Wl,--export-dynamic"
		fi;;
	SunOS/5*) case $CC in
		  *gcc*)
		    if $CC -Xlinker --help 2>&1 | grep export-dynamic >/dev/null
		    then
			LINKFORSHARED="-Xlinker --export-dynamic"
		    fi;;
		  esac;;
	CYGWIN*)
		if test $enable_shared = "no"
		then
			LINKFORSHARED='-Wl,--out-implib=$(LDLIBRARY)'
		fi;;
	QNX*)
		# -Wl,-E causes the symbols to be added to the dynamic
		# symbol table so that they can be found when a module
		# is loaded.  -N 2048K causes the stack size to be set
		# to 2048 kilobytes so that the stack doesn't overflow
		# when running test_compile.py.
		LINKFORSHARED='-Wl,-E -N 2048K';;
	VxWorks*)
		LINKFORSHARED='-Wl,-export-dynamic';;
	esac
fi
AC_MSG_RESULT($LINKFORSHARED)


AC_SUBST(CFLAGSFORSHARED)
AC_MSG_CHECKING(CFLAGSFORSHARED)
if test ! "$LIBRARY" = "$LDLIBRARY"
then
	case $ac_sys_system in
	CYGWIN*)
		# Cygwin needs CCSHARED when building extension DLLs
		# but not when building the interpreter DLL.
		CFLAGSFORSHARED='';;
	*)
		CFLAGSFORSHARED='$(CCSHARED)'
	esac
fi
AC_MSG_RESULT($CFLAGSFORSHARED)

# SHLIBS are libraries (except -lc and -lm) to link to the python shared
# library (with --enable-shared).
# For platforms on which shared libraries are not allowed to have unresolved
# symbols, this must be set to $(LIBS) (expanded by make). We do this even
# if it is not required, since it creates a dependency of the shared library
# to LIBS. This, in turn, means that applications linking the shared libpython
# don't need to link LIBS explicitly. The default should be only changed
# on systems where this approach causes problems.
AC_SUBST(SHLIBS)
AC_MSG_CHECKING(SHLIBS)
case "$ac_sys_system" in
	*)
		SHLIBS='$(LIBS)';;
esac
AC_MSG_RESULT($SHLIBS)


# checks for libraries
AC_CHECK_LIB(sendfile, sendfile)
AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX


dnl check for uuid dependencies
AH_TEMPLATE([HAVE_UUID_H], [Define to 1 if you have the <uuid.h> header file.])
AH_TEMPLATE([HAVE_UUID_UUID_H], [Define to 1 if you have the <uuid/uuid.h> header file.])
AH_TEMPLATE([HAVE_UUID_GENERATE_TIME_SAFE], [Define if uuid_generate_time_safe() exists.])
have_uuid=missing

dnl AIX provides support for RFC4122 (uuid) in libc.a starting with AIX 6.1
dnl (anno 2007). FreeBSD and OpenBSD provides support in libc as well.
dnl Little-endian FreeBSD, OpenBSD and NetBSD needs encoding into an octet
dnl stream in big-endian byte-order
AC_CHECK_HEADERS([uuid.h], [
  AC_CHECK_FUNCS([uuid_create uuid_enc_be], [
    have_uuid=yes
    LIBUUID_CFLAGS=${LIBUUID_CFLAGS-""}
    LIBUUID_LIBS=${LIBUUID_LIBS-""}
  ])
])

AS_VAR_IF([have_uuid], [missing], [
  PKG_CHECK_MODULES(
    [LIBUUID], [uuid >= 2.20], [
      dnl linux-util's libuuid has uuid_generate_time_safe() since v2.20 (2011)
      dnl and provides <uuid.h>.
      have_uuid=yes
      AC_DEFINE([HAVE_UUID_H], [1])
      AC_DEFINE([HAVE_UUID_GENERATE_TIME_SAFE], [1])
    ], [
      AC_CHECK_HEADERS([uuid/uuid.h], [
        WITH_SAVE_ENV(
          [AC_CHECK_LIB([uuid], [uuid_generate_time], [have_uuid=yes])
        ])
        WITH_SAVE_ENV([
          AC_CHECK_LIB([uuid], [uuid_generate_time_safe], [
            have_uuid=yes
            AC_DEFINE([HAVE_UUID_GENERATE_TIME_SAFE], [1])
          ])
        ])
        AS_VAR_IF([have_uuid], [yes], [
          LIBUUID_CFLAGS=${LIBUUID_CFLAGS-""}
          LIBUUID_LIBS=${LIBUUID_LIBS-"-luuid"}
        ])
      ])
    ]
  )
])

dnl macOS has uuid/uuid.h but uuid_generate_time is in libc
AS_VAR_IF([have_uuid], [missing], [
  AC_CHECK_HEADERS([uuid/uuid.h], [
    AC_CHECK_FUNC([uuid_generate_time], [
      have_uuid=yes
      LIBUUID_CFLAGS=${LIBUUID_CFLAGS-""}
      LIBUUID_LIBS=${LIBUUID_LIBS-""}
    ])
  ])
])

AS_VAR_IF([have_uuid], [missing], [have_uuid=no])

# 'Real Time' functions on Solaris
# posix4 on Solaris 2.6
# pthread (first!) on Linux
AC_SEARCH_LIBS(sem_init, pthread rt posix4)

# check if we need libintl for locale functions
AC_CHECK_LIB(intl, textdomain,
	[AC_DEFINE(WITH_LIBINTL, 1,
	[Define to 1 if libintl is needed for locale functions.])
        LIBS="-lintl $LIBS"])

# checks for system dependent C++ extensions support
case "$ac_sys_system" in
	AIX*)	AC_MSG_CHECKING(for genuine AIX C++ extensions support)
		AC_LINK_IFELSE([
		  AC_LANG_PROGRAM([[#include <load.h>]],
				  [[loadAndInit("", 0, "")]])
		],[
		  AC_DEFINE(AIX_GENUINE_CPLUSPLUS, 1,
                      [Define for AIX if your compiler is a genuine IBM xlC/xlC_r
                       and you want support for AIX C++ shared extension modules.])
		  AC_MSG_RESULT(yes)
		],[
		  AC_MSG_RESULT(no)
		])
dnl The AIX_BUILDDATE is obtained from the kernel fileset - bos.mp64
# BUILD_GNU_TYPE + AIX_BUILDDATE are used to construct the platform_tag
# of the AIX system used to build/package Python executable. This tag serves
# as a baseline for bdist module packages
               AC_MSG_CHECKING(for the system builddate)
               AIX_BUILDDATE=$(lslpp -Lcq bos.mp64 | awk -F:  '{ print $NF }')
               AC_DEFINE_UNQUOTED([AIX_BUILDDATE], [$AIX_BUILDDATE],
                   [BUILD_GNU_TYPE + AIX_BUILDDATE are used to construct the PEP425 tag of the build system.])
               AC_MSG_RESULT($AIX_BUILDDATE)
               ;;
	*) ;;
esac

# check for systems that require aligned memory access
AC_CACHE_CHECK([aligned memory access is required], [ac_cv_aligned_required],
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
int main()
{
    char s[16];
    int i, *p1, *p2;
    for (i=0; i < 16; i++)
        s[i] = i;
    p1 = (int*)(s+1);
    p2 = (int*)(s+2);
    if (*p1 == *p2)
        return 1;
    return 0;
}]])],
[ac_cv_aligned_required=no],
[ac_cv_aligned_required=yes],
[ac_cv_aligned_required=yes])
])
if test "$ac_cv_aligned_required" = yes ; then
  AC_DEFINE([HAVE_ALIGNED_REQUIRED], [1],
    [Define if aligned memory access is required])
fi

# str, bytes and memoryview hash algorithm
AH_TEMPLATE(Py_HASH_ALGORITHM,
  [Define hash algorithm for str, bytes and memoryview.
   SipHash24: 1, FNV: 2, SipHash13: 3, externally defined: 0])

AC_MSG_CHECKING(for --with-hash-algorithm)
dnl quadrigraphs "@<:@" and "@:>@" produce "[" and "]" in the output
AC_ARG_WITH(hash_algorithm,
            AS_HELP_STRING([--with-hash-algorithm=@<:@fnv|siphash13|siphash24@:>@],
                           [select hash algorithm for use in Python/pyhash.c (default is SipHash13)]),
[
AC_MSG_RESULT($withval)
case "$withval" in
    siphash13)
        AC_DEFINE(Py_HASH_ALGORITHM, 3)
        ;;
    siphash24)
        AC_DEFINE(Py_HASH_ALGORITHM, 1)
        ;;
    fnv)
        AC_DEFINE(Py_HASH_ALGORITHM, 2)
        ;;
    *)
        AC_MSG_ERROR([unknown hash algorithm '$withval'])
        ;;
esac
],
[AC_MSG_RESULT(default)])

validate_tzpath() {
    # Checks that each element of the path is an absolute path
    if test -z "$1"; then
        # Empty string is allowed: it indicates no system TZPATH
        return 0
    fi

    # Bad paths are those that don't start with /
    dnl quadrigraphs "@<:@" and "@:>@" produce "[" and "]" in the output
    if ( echo $1 | grep '\(^\|:\)\(@<:@^/@:>@\|$\)' > /dev/null); then
        AC_MSG_ERROR([--with-tzpath must contain only absolute paths, not $1])
        return 1;
    fi
}

TZPATH="/usr/share/zoneinfo:/usr/lib/zoneinfo:/usr/share/lib/zoneinfo:/etc/zoneinfo"
AC_MSG_CHECKING(for --with-tzpath)
AC_ARG_WITH(tzpath,
            AS_HELP_STRING([--with-tzpath=<list of absolute paths separated by pathsep>]
                           [Select the default time zone search path for zoneinfo.TZPATH]),
[
case "$withval" in
    yes)
        AC_MSG_ERROR([--with-tzpath requires a value])
        ;;
    *)
        validate_tzpath "$withval"
        TZPATH="$withval"
        AC_MSG_RESULT("$withval")
        ;;
esac
],
[validate_tzpath "$TZPATH"
 AC_MSG_RESULT("$TZPATH")])
AC_SUBST(TZPATH)

# Most SVR4 platforms (e.g. Solaris) need -lsocket and -lnsl.
AC_CHECK_LIB(nsl, t_open, [LIBS="-lnsl $LIBS"]) # SVR4
AC_CHECK_LIB(socket, socket, [LIBS="-lsocket $LIBS"], [], $LIBS) # SVR4 sockets

case $ac_sys_system/$ac_sys_release in
    Haiku*)
        AC_CHECK_LIB(network, socket, [LIBS="-lnetwork $LIBS"], [], $LIBS)
    ;;
esac

AC_MSG_CHECKING(for --with-libs)
AC_ARG_WITH(libs,
            AS_HELP_STRING([--with-libs='lib1 ...'], [link against additional libs (default is no)]),
[
AC_MSG_RESULT($withval)
LIBS="$withval $LIBS"
],
[AC_MSG_RESULT(no)])

# Check for use of the system expat library
AC_MSG_CHECKING(for --with-system-expat)
AC_ARG_WITH(system_expat,
            AS_HELP_STRING([--with-system-expat], [build pyexpat module using an installed expat library, see Doc/library/pyexpat.rst (default is no)]),
            [],
            [with_system_expat="no"])

AC_MSG_RESULT($with_system_expat)

AS_VAR_IF([with_system_expat], [yes], [
  LIBEXPAT_CFLAGS=${LIBEXPAT_CFLAGS-""}
  LIBEXPAT_LDFLAGS=${LIBEXPAT_LDFLAGS-"-lexpat"}
  LIBEXPAT_INTERNAL=
], [
  LIBEXPAT_CFLAGS="-I\$(srcdir)/Modules/expat"
  LIBEXPAT_LDFLAGS="-lm \$(LIBEXPAT_A)"
  LIBEXPAT_INTERNAL="\$(LIBEXPAT_A)"
])

AC_SUBST([LIBEXPAT_CFLAGS])
AC_SUBST([LIBEXPAT_LDFLAGS])
AC_SUBST([LIBEXPAT_INTERNAL])

# Check for use of the system libffi library
AC_MSG_CHECKING(for --with-system-ffi)
AC_ARG_WITH(system_ffi,
            AS_HELP_STRING([--with-system-ffi], [build _ctypes module using an installed ffi library, see Doc/library/ctypes.rst (default is system-dependent)]),,,)

if test "$ac_sys_system" = "Darwin"
then
    case "$with_system_ffi" in
        "")
            with_system_ffi="no"
            ;;
        yes|no)
            ;;
        *)
            AC_MSG_ERROR([--with-system-ffi accepts no arguments])
            ;;
    esac
    AC_MSG_RESULT($with_system_ffi)
else
    AC_MSG_RESULT(yes)
    if test "$with_system_ffi" != ""
    then
        AC_MSG_WARN([--with(out)-system-ffi is ignored on this platform])
    fi
    with_system_ffi="yes"
fi

if test "$with_system_ffi" = "yes" && test -n "$PKG_CONFIG"; then
    LIBFFI_INCLUDEDIR="`"$PKG_CONFIG" libffi --cflags-only-I 2>/dev/null | sed -e 's/^-I//;s/ *$//'`"
else
    LIBFFI_INCLUDEDIR=""
fi
AC_SUBST(LIBFFI_INCLUDEDIR)

# Check for use of the system libmpdec library
AC_MSG_CHECKING(for --with-system-libmpdec)
AC_ARG_WITH(system_libmpdec,
            AS_HELP_STRING([--with-system-libmpdec], [build _decimal module using an installed libmpdec library, see Doc/library/decimal.rst (default is no)]),
            [],
            [with_system_libmpdec="no"])
AC_MSG_RESULT($with_system_libmpdec)

AS_VAR_IF([with_system_libmpdec], [yes], [
  LIBMPDEC_CFLAGS=${LIBMPDEC_CFLAGS-""}
  LIBMPDEC_LDFLAGS=${LIBMPDEC_LDFLAGS-"-lmpdec"}
  LIBMPDEC_INTERNAL=
], [
  LIBMPDEC_CFLAGS="-I\$(srcdir)/Modules/_decimal/libmpdec"
  LIBMPDEC_LDFLAGS="-lm \$(LIBMPDEC_A)"
  LIBMPDEC_INTERNAL="\$(LIBMPDEC_A)"
])

AC_SUBST([LIBMPDEC_CFLAGS])
AC_SUBST([LIBMPDEC_LDFLAGS])
AC_SUBST([LIBMPDEC_INTERNAL])

# Check whether _decimal should use a coroutine-local or thread-local context
AC_MSG_CHECKING(for --with-decimal-contextvar)
AC_ARG_WITH(decimal_contextvar,
            AS_HELP_STRING([--with-decimal-contextvar], [build _decimal module using a coroutine-local rather than a thread-local context (default is yes)]),
            [],
            [with_decimal_contextvar="yes"])

if test "$with_decimal_contextvar" != "no"
then
    AC_DEFINE(WITH_DECIMAL_CONTEXTVAR, 1,
      [Define if you want build the _decimal module using a coroutine-local rather than a thread-local context])
fi

AC_MSG_RESULT($with_decimal_contextvar)

# Check for libmpdec machine flavor
AC_MSG_CHECKING(for decimal libmpdec machine)
AS_CASE([$ac_sys_system],
  [Darwin*], [libmpdec_system=Darwin],
  [SunOS*], [libmpdec_system=sunos],
  [libmpdec_system=other]
)

libmpdec_machine=unknown
if test "$libmpdec_system" = Darwin; then
    # universal here means: build libmpdec with the same arch options
    # the python interpreter was built with
    libmpdec_machine=universal
elif test $ac_cv_sizeof_size_t -eq 8; then
    if test "$ac_cv_gcc_asm_for_x64" = yes; then
        libmpdec_machine=x64
    elif test "$ac_cv_type___uint128_t" = yes; then
        libmpdec_machine=uint128
    else
        libmpdec_machine=ansi64
    fi
elif test $ac_cv_sizeof_size_t -eq 4; then
    if test "$ac_cv_gcc_asm_for_x87" = yes -a "$libmpdec_system" != sunos; then
        AS_CASE([$CC],
            [*gcc*],   [libmpdec_machine=ppro],
            [*clang*], [libmpdec_machine=ppro],
            [libmpdec_machine=ansi32]
        )
    else
        libmpdec_machine=ansi32
    fi
fi
AC_MSG_RESULT([$libmpdec_machine])

AS_CASE([$libmpdec_machine],
  [x64],         [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DCONFIG_64=1 -DASM=1"])],
  [uint128],     [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DCONFIG_64=1 -DANSI=1 -DHAVE_UINT128_T=1"])],
  [ansi64],      [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DCONFIG_64=1 -DANSI=1"])],
  [ppro],        [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DCONFIG_32=1 -DANSI=1 -DASM=1 -Wno-unknown-pragmas"])],
  [ansi32],      [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DCONFIG_32=1 -DANSI=1"])],
  [ansi-legacy], [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DCONFIG_32=1 -DANSI=1 -DLEGACY_COMPILER=1"])],
  [universal],   [AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -DUNIVERSAL=1"])],
  [AC_MSG_ERROR([_decimal: unsupported architecture])]
)

if test "$have_ipa_pure_const_bug" = yes; then
    # Some versions of gcc miscompile inline asm:
    # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491
    # https://gcc.gnu.org/ml/gcc/2010-11/msg00366.html
    AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -fno-ipa-pure-const"])
fi

if test "$have_glibc_memmove_bug" = yes; then
    # _FORTIFY_SOURCE wrappers for memmove and bcopy are incorrect:
    # https://sourceware.org/ml/libc-alpha/2010-12/msg00009.html
    AS_VAR_APPEND([LIBMPDEC_CFLAGS], [" -U_FORTIFY_SOURCE"])
fi


dnl check for NIS / libnsl dependencies
dnl libnsl dependencies include tirpc includes and lib
PKG_CHECK_MODULES([LIBNSL], [libnsl], [have_nis=yes], [
  LIBNSL_CFLAGS=${LIBNSL_CFLAGS-""}
  WITH_SAVE_ENV([
    AC_SEARCH_LIBS([yp_match], [nsl], [have_nis=yes], [have_nis=no])
  ])
  AS_CASE([$ac_cv_search_yp_match],
    [no], [libnsl=""],
    ["none required"], [libnsl=""],
    [libnsl="$ac_cv_search_yp_match"]
  )
  LIBNSL_LIBS=${LIBNSL_LIBS-$libnsl}
])

AS_VAR_IF([have_nis], [yes], [
  WITH_SAVE_ENV([
    CPPFLAGS="$LIBNSL_CFLAGS $CFLAGS"
    AC_CHECK_HEADERS([rpc/rpc.h])
  ])
])

dnl Check for SQLite library. Use pkg-config if available.
PKG_CHECK_MODULES(
  [LIBSQLITE3], [sqlite3 >= 3.7.15], [], [
    LIBSQLITE3_CFLAGS=${LIBSQLITE3_CFLAGS-""}
    LIBSQLITE3_LIBS=${LIBSQLITE3_LIBS-"-lsqlite3"}
  ]
)
AS_VAR_APPEND([LIBSQLITE3_CFLAGS], [' -I$(srcdir)/Modules/_sqlite'])

WITH_SAVE_ENV(
dnl bpo-45774/GH-29507: The CPP check in AC_CHECK_HEADER can fail on FreeBSD,
dnl hence CPPFLAGS instead of CFLAGS.
  CPPFLAGS="$LIBSQLITE3_CFLAGS $CFLAGS"
  LDFLAGS="$LIBSQLITE3_LIBS $LDFLAGS"

  AC_CHECK_HEADER([sqlite3.h], [
    AC_CHECK_LIB([sqlite3], [sqlite3_open_v2], [
      have_sqlite3=yes
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([
          #include <sqlite3.h>
          #if SQLITE_VERSION_NUMBER < 3007015
          #  error "SQLite 3.7.15 or higher required"
          #endif
        ], [])
      ], [have_supported_sqlite3=yes], [have_supported_sqlite3=no])
    ], [have_sqlite3=no])
    AC_CHECK_LIB([sqlite3], [sqlite3_load_extension],
                 [have_sqlite3_load_extension=yes],
                 [have_sqlite3_load_extension=no])
  ])
)

# Check for support for loadable sqlite extensions
AC_MSG_CHECKING(for --enable-loadable-sqlite-extensions)
AC_ARG_ENABLE(loadable-sqlite-extensions,
              AS_HELP_STRING([--enable-loadable-sqlite-extensions],
                             [support loadable extensions in _sqlite module, see Doc/library/sqlite3.rst (default is no)]),
              [AS_VAR_IF([have_sqlite3_load_extension], [no],
                         [AC_MSG_WARN([Your version of SQLite does not support loadable extensions])])],
              [enable_loadable_sqlite_extensions=no])
AC_MSG_RESULT($enable_loadable_sqlite_extensions)

AS_VAR_IF([enable_loadable_sqlite_extensions], [yes], [
  AC_DEFINE(PY_SQLITE_ENABLE_LOAD_EXTENSION, 1,
  [Define to 1 to build the sqlite module with loadable extensions support.])
])

# Check for --with-tcltk-includes=path and --with-tcltk-libs=path
AC_SUBST(TCLTK_INCLUDES)
AC_SUBST(TCLTK_LIBS)
AC_MSG_CHECKING(for --with-tcltk-includes)
AC_ARG_WITH(tcltk-includes,
            AS_HELP_STRING([--with-tcltk-includes='-I...'], [override search for Tcl and Tk include files]),
            [],
            [with_tcltk_includes="default"])
AC_MSG_RESULT($with_tcltk_includes)
AC_MSG_CHECKING(for --with-tcltk-libs)
AC_ARG_WITH(tcltk-libs,
            AS_HELP_STRING([--with-tcltk-libs='-L...'], [override search for Tcl and Tk libs]),
            [],
            [with_tcltk_libs="default"])
AC_MSG_RESULT($with_tcltk_libs)
if test "x$with_tcltk_includes" = xdefault || test "x$with_tcltk_libs" = xdefault
then
  if test "x$with_tcltk_includes" != "x$with_tcltk_libs"
  then
    AC_MSG_ERROR([use both --with-tcltk-includes='...' and --with-tcltk-libs='...' or neither])
  fi
  if test -n "$PKG_CONFIG" && "$PKG_CONFIG" --exists tcl tk; then
    TCLTK_INCLUDES="`"$PKG_CONFIG" tcl tk --cflags-only-I 2>/dev/null`"
    TCLTK_LIBS="`"$PKG_CONFIG" tcl tk --libs 2>/dev/null`"
  else
    TCLTK_INCLUDES=""
    TCLTK_LIBS=""
  fi
else
  TCLTK_INCLUDES="$with_tcltk_includes"
  TCLTK_LIBS="$with_tcltk_libs"
fi

dnl check for _gdbmmodule dependencies
dnl NOTE: gdbm does not provide a pkgconf file.
AC_ARG_VAR([GDBM_CFLAGS], [C compiler flags for gdbm])
AC_ARG_VAR([GDBM_LIBS], [additional linker flags for gdbm])
WITH_SAVE_ENV([
  CPPFLAGS="$GDBM_CFLAGS $CFLAGS"
  LDFLAGS="$GDBM_LIBS $LDFLAGS"
  AC_CHECK_HEADERS([gdbm.h], [
    AC_CHECK_LIB([gdbm], [gdbm_open], [
      have_gdbm=yes
      GDBM_LIBS=${GDBM_LIBS-"-lgdbm"}
    ], [have_gdbm=no])
  ], [have_gdbm=no])
])

# check for _dbmmodule.c dependencies
AC_CHECK_HEADERS([ndbm.h], [
  LIBS_SAVE="$LIBS"
  AC_CHECK_LIB([ndbm], [dbm_open])
  LIBS="$LIBS_SAVE"
  AC_CHECK_LIB([gdbm_compat], [dbm_open])
  LIBS="$LIBS_SAVE"
])

# "gdbm-ndbm.h" and "gdbm/ndbm.h" are both normalized to "gdbm_ndbm_h"
# unset ac_cv_header_gdbm_ndbm_h to prevent false positive cache hits.
AS_UNSET([ac_cv_header_gdbm_ndbm_h])
AC_CACHE_VAL([ac_cv_header_gdbm_slash_ndbm_h], [
  AC_CHECK_HEADER(
    [gdbm/ndbm.h],
    [ac_cv_header_gdbm_slash_ndbm_h=yes], [ac_cv_header_gdbm_slash_ndbm_h=no]
  )
])
AS_VAR_IF([ac_cv_header_gdbm_slash_ndbm_h], [yes], [
  AC_DEFINE([HAVE_GDBM_NDBM_H], [1], [Define to 1 if you have the <gdbm/ndbm.h> header file.])
])

AS_UNSET([ac_cv_header_gdbm_ndbm_h])
AC_CACHE_VAL([ac_cv_header_gdbm_dash_ndbm_h], [
  AC_CHECK_HEADER(
    [gdbm-ndbm.h],
    [ac_cv_header_gdbm_dash_ndbm_h=yes], [ac_cv_header_gdbm_dash_ndbm_h=no]
  )
])
AS_VAR_IF([ac_cv_header_gdbm_dash_ndbm_h], [yes], [
  AC_DEFINE([HAVE_GDBM_DASH_NDBM_H], [1], [Define to 1 if you have the <gdbm-ndbm.h> header file.])
])
AS_UNSET([ac_cv_header_gdbm_ndbm_h])

if test "$ac_cv_header_gdbm_slash_ndbm_h" = yes -o "$ac_cv_header_gdbm_dash_ndbm_h" = yes; then
  LIBS_SAVE="$LIBS"
  AC_CHECK_LIB([gdbm_compat], [dbm_open])
  LIBS="$LIBS_SAVE"
fi

# Check for libdb >= 5 with dbm_open()
# db.h re-defines the name of the function
AC_CHECK_HEADERS([db.h], [
  AC_CACHE_CHECK([for libdb], [ac_cv_have_libdb], [
    LIBS_SAVE="$LIBS"
    LIBS="$LIBS -ldb"
    AC_LINK_IFELSE([AC_LANG_PROGRAM([
      #define DB_DBM_HSEARCH 1
      #include <db.h>
      #if DB_VERSION_MAJOR < 5
        #error "dh.h: DB_VERSION_MAJOR < 5 is not supported."
      #endif
      ], [DBM *dbm = dbm_open(NULL, 0, 0)])
    ], [ac_cv_have_libdb=yes], [ac_cv_have_libdb=no])
    LIBS="$LIBS_SAVE"
  ])
  AS_VAR_IF([ac_cv_have_libdb], [yes], [
    AC_DEFINE([HAVE_LIBDB], [1], [Define to 1 if you have the `db' library (-ldb).])
  ])
])

# Check for --with-dbmliborder
AC_MSG_CHECKING(for --with-dbmliborder)
AC_ARG_WITH(dbmliborder,
            AS_HELP_STRING([--with-dbmliborder=db1:db2:...], [override order to check db backends for dbm; a valid value is a colon separated string with the backend names `ndbm', `gdbm' and `bdb'.]),
[], [with_dbmliborder=ndbm:gdbm:bdb])

have_gdbm_dbmliborder=no
as_save_IFS=$IFS
IFS=:
for db in $with_dbmliborder; do
    AS_CASE([$db],
      [ndbm], [],
      [gdbm], [have_gdbm_dbmliborder=yes],
      [bdb], [],
      [with_dbmliborder=error]
    )
done
IFS=$as_save_IFS
AS_VAR_IF([with_dbmliborder], [error], [
  AC_MSG_ERROR([proper usage is --with-dbmliborder=db1:db2:... (ndbm:gdbm:bdb)])
])
AC_MSG_RESULT($with_dbmliborder)

# Templates for things AC_DEFINEd more than once.
# For a single AC_DEFINE, no template is needed.
AH_TEMPLATE(_REENTRANT,
  [Define to force use of thread-safe errno, h_errno, and other functions])

if test "$ac_cv_pthread_is_default" = yes
then
    # Defining _REENTRANT on system with POSIX threads should not hurt.
    AC_DEFINE(_REENTRANT)
    posix_threads=yes
    if test "$ac_sys_system" = "SunOS"; then
        CFLAGS="$CFLAGS -D_REENTRANT"
    fi
elif test "$ac_cv_kpthread" = "yes"
then
    CC="$CC -Kpthread"
    if test "$ac_cv_cxx_thread" = "yes"; then
        CXX="$CXX -Kpthread"
    fi
    posix_threads=yes
elif test "$ac_cv_kthread" = "yes"
then
    CC="$CC -Kthread"
    if test "$ac_cv_cxx_thread" = "yes"; then
        CXX="$CXX -Kthread"
    fi
    posix_threads=yes
elif test "$ac_cv_pthread" = "yes"
then
    CC="$CC -pthread"
    if test "$ac_cv_cxx_thread" = "yes"; then
        CXX="$CXX -pthread"
    fi
    posix_threads=yes
else
    if test ! -z "$withval" -a -d "$withval"
    then LDFLAGS="$LDFLAGS -L$withval"
    fi

    # According to the POSIX spec, a pthreads implementation must
    # define _POSIX_THREADS in unistd.h. Some apparently don't
    # (e.g. gnu pth with pthread emulation)
    AC_MSG_CHECKING(for _POSIX_THREADS in unistd.h)
    AC_EGREP_CPP(yes,
    [
#include <unistd.h>
#ifdef _POSIX_THREADS
yes
#endif
    ], unistd_defines_pthreads=yes, unistd_defines_pthreads=no)
    AC_MSG_RESULT($unistd_defines_pthreads)

    AC_DEFINE(_REENTRANT)
    # Just looking for pthread_create in libpthread is not enough:
    # on HP/UX, pthread.h renames pthread_create to a different symbol name.
    # So we really have to include pthread.h, and then link.
    _libs=$LIBS
    LIBS="$LIBS -lpthread"
    AC_MSG_CHECKING([for pthread_create in -lpthread])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#include <pthread.h>

void * start_routine (void *arg) { exit (0); }]], [[
pthread_create (NULL, NULL, start_routine, NULL)]])],[
    AC_MSG_RESULT(yes)
    posix_threads=yes
    ],[
    LIBS=$_libs
    AC_CHECK_FUNC(pthread_detach, [
    posix_threads=yes
    ],[
    AC_CHECK_LIB(pthreads, pthread_create, [
    posix_threads=yes
    LIBS="$LIBS -lpthreads"
    ], [
    AC_CHECK_LIB(c_r, pthread_create, [
    posix_threads=yes
    LIBS="$LIBS -lc_r"
    ], [
    AC_CHECK_LIB(pthread, __pthread_create_system, [
    posix_threads=yes
    LIBS="$LIBS -lpthread"
    ], [
    AC_CHECK_LIB(cma, pthread_create, [
    posix_threads=yes
    LIBS="$LIBS -lcma"
    ],[
    AC_MSG_ERROR([could not find pthreads on your system])
    ])
    ])])])])])

    AC_CHECK_LIB(mpc, usconfig, [
    LIBS="$LIBS -lmpc"
    ])

fi

if test "$posix_threads" = "yes"; then
      if test "$unistd_defines_pthreads" = "no"; then
         AC_DEFINE(_POSIX_THREADS, 1,
         [Define if you have POSIX threads,
          and your system does not define that.])
      fi

      # Bug 662787: Using semaphores causes unexplicable hangs on Solaris 8.
      case  $ac_sys_system/$ac_sys_release in
      SunOS/5.6) AC_DEFINE(HAVE_PTHREAD_DESTRUCTOR, 1,
                       [Defined for Solaris 2.6 bug in pthread header.])
		       ;;
      SunOS/5.8) AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
		       [Define if the Posix semaphores do not work on your system])
		       ;;
      AIX/*) AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
		       [Define if the Posix semaphores do not work on your system])
		       ;;
      esac

      AC_CACHE_CHECK([if PTHREAD_SCOPE_SYSTEM is supported], [ac_cv_pthread_system_supported],
      [AC_RUN_IFELSE([AC_LANG_SOURCE([[
      #include <stdio.h>
      #include <pthread.h>
      void *foo(void *parm) {
        return NULL;
      }
      main() {
        pthread_attr_t attr;
        pthread_t id;
        if (pthread_attr_init(&attr)) return (-1);
        if (pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM)) return (-1);
        if (pthread_create(&id, &attr, foo, NULL)) return (-1);
        return (0);
      }]])],
      [ac_cv_pthread_system_supported=yes],
      [ac_cv_pthread_system_supported=no],
      [ac_cv_pthread_system_supported=no])
      ])
      if test "$ac_cv_pthread_system_supported" = "yes"; then
        AC_DEFINE(PTHREAD_SYSTEM_SCHED_SUPPORTED, 1, [Defined if PTHREAD_SCOPE_SYSTEM supported.])
      fi
      AC_CHECK_FUNCS(pthread_sigmask,
        [case $ac_sys_system in
        CYGWIN*)
          AC_DEFINE(HAVE_BROKEN_PTHREAD_SIGMASK, 1,
            [Define if pthread_sigmask() does not work on your system.])
            ;;
        esac])
      AC_CHECK_FUNCS(pthread_getcpuclockid)
fi


# Check for enable-ipv6
AH_TEMPLATE(ENABLE_IPV6, [Define if --enable-ipv6 is specified])
AC_MSG_CHECKING([if --enable-ipv6 is specified])
AC_ARG_ENABLE(ipv6,
    AS_HELP_STRING([--enable-ipv6],
               [enable ipv6 (with ipv4) support, see Doc/library/socket.rst (default is yes if supported)]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       ipv6=no
       ;;
  *)   AC_MSG_RESULT(yes)
       AC_DEFINE(ENABLE_IPV6)
       ipv6=yes
       ;;
  esac ],

[
dnl the check does not work on cross compilation case...
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ /* AF_INET6 available check */
#include <sys/types.h>
#include <sys/socket.h>]],
[[int domain = AF_INET6;]])],[
  AC_MSG_RESULT(yes)
  ipv6=yes
],[
  AC_MSG_RESULT(no)
  ipv6=no
])

if test "$ipv6" = "yes"; then
	AC_MSG_CHECKING(if RFC2553 API is available)
	AC_COMPILE_IFELSE([
	  AC_LANG_PROGRAM([[#include <sys/types.h>
#include <netinet/in.h>]],
			  [[struct sockaddr_in6 x;
			    x.sin6_scope_id;]])
	],[
	  AC_MSG_RESULT(yes)
	  ipv6=yes
	],[
	  AC_MSG_RESULT(no, IPv6 disabled)
	  ipv6=no
	])
fi

if test "$ipv6" = "yes"; then
	AC_DEFINE(ENABLE_IPV6)
fi
])

ipv6type=unknown
ipv6lib=none
ipv6trylibc=no

if test "$ipv6" = "yes"; then
	AC_MSG_CHECKING([ipv6 stack type])
	for i in inria kame linux-glibc linux-inet6 solaris toshiba v6d zeta;
	do
		case $i in
		inria)
			dnl http://www.kame.net/
			AC_EGREP_CPP(yes, [
#include <netinet/in.h>
#ifdef IPV6_INRIA_VERSION
yes
#endif],
				[ipv6type=$i])
			;;
		kame)
			dnl http://www.kame.net/
			AC_EGREP_CPP(yes, [
#include <netinet/in.h>
#ifdef __KAME__
yes
#endif],
				[ipv6type=$i;
				ipv6lib=inet6
				ipv6libdir=/usr/local/v6/lib
				ipv6trylibc=yes])
			;;
		linux-glibc)
			dnl http://www.v6.linux.or.jp/
			AC_EGREP_CPP(yes, [
#include <features.h>
#if defined(__GLIBC__) && ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2))
yes
#endif],
				[ipv6type=$i;
				ipv6trylibc=yes])
			;;
		linux-inet6)
			dnl http://www.v6.linux.or.jp/
			if test -d /usr/inet6; then
				ipv6type=$i
				ipv6lib=inet6
				ipv6libdir=/usr/inet6/lib
				BASECFLAGS="-I/usr/inet6/include $BASECFLAGS"
			fi
			;;
		solaris)
			if test -f /etc/netconfig; then
                          if $GREP -q tcp6 /etc/netconfig; then
				ipv6type=$i
				ipv6trylibc=yes
                          fi
                        fi
			;;
		toshiba)
			AC_EGREP_CPP(yes, [
#include <sys/param.h>
#ifdef _TOSHIBA_INET6
yes
#endif],
				[ipv6type=$i;
				ipv6lib=inet6;
				ipv6libdir=/usr/local/v6/lib])
			;;
		v6d)
			AC_EGREP_CPP(yes, [
#include </usr/local/v6/include/sys/v6config.h>
#ifdef __V6D__
yes
#endif],
				[ipv6type=$i;
				ipv6lib=v6;
				ipv6libdir=/usr/local/v6/lib;
				BASECFLAGS="-I/usr/local/v6/include $BASECFLAGS"])
			;;
		zeta)
			AC_EGREP_CPP(yes, [
#include <sys/param.h>
#ifdef _ZETA_MINAMI_INET6
yes
#endif],
				[ipv6type=$i;
				ipv6lib=inet6;
				ipv6libdir=/usr/local/v6/lib])
			;;
		esac
		if test "$ipv6type" != "unknown"; then
			break
		fi
	done
	AC_MSG_RESULT($ipv6type)
fi

if test "$ipv6" = "yes" -a "$ipv6lib" != "none"; then
	if test -d $ipv6libdir -a -f $ipv6libdir/lib$ipv6lib.a; then
		LIBS="-L$ipv6libdir -l$ipv6lib $LIBS"
		AC_MSG_NOTICE([using lib$ipv6lib])
	else
    AS_VAR_IF([ipv6trylibc], [yes], [
      AC_MSG_NOTICE([using libc])
    ], [
      AC_MSG_ERROR([m4_normalize([
        No $ipv6lib library found; cannot continue.
        You need to fetch lib$ipv6lib.a from appropriate
        ipv6 kit and compile beforehand.
      ])])
    ])
	fi
fi


AC_CACHE_CHECK([CAN_RAW_FD_FRAMES], [ac_cv_can_raw_fd_frames], [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ /* CAN_RAW_FD_FRAMES available check */
#include <linux/can/raw.h>]],
[[int can_raw_fd_frames = CAN_RAW_FD_FRAMES;]])],
[ac_cv_can_raw_fd_frames=yes],
[ac_cv_can_raw_fd_frames=no])
])
AS_VAR_IF([ac_cv_can_raw_fd_frames], [yes], [
    AC_DEFINE(HAVE_LINUX_CAN_RAW_FD_FRAMES, 1, [Define if compiling using Linux 3.6 or later.])
])

AC_CACHE_CHECK([for CAN_RAW_JOIN_FILTERS], [ac_cv_can_raw_join_filters], [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <linux/can/raw.h>]],
[[int can_raw_join_filters = CAN_RAW_JOIN_FILTERS;]])],
[ac_cv_can_raw_join_filters=yes],
[ac_cv_can_raw_join_filters=no])
])
AS_VAR_IF([ac_cv_can_raw_join_filters], [yes], [
    AC_DEFINE(HAVE_LINUX_CAN_RAW_JOIN_FILTERS, 1, [Define if compiling using Linux 4.1 or later.])
])

# Check for --with-doc-strings
AC_MSG_CHECKING(for --with-doc-strings)
AC_ARG_WITH(doc-strings,
            AS_HELP_STRING([--with-doc-strings], [enable documentation strings (default is yes)]))

if test -z "$with_doc_strings"
then with_doc_strings="yes"
fi
if test "$with_doc_strings" != "no"
then
    AC_DEFINE(WITH_DOC_STRINGS, 1,
      [Define if you want documentation strings in extension modules])
fi
AC_MSG_RESULT($with_doc_strings)

# Check for Python-specific malloc support
AC_MSG_CHECKING(for --with-pymalloc)
AC_ARG_WITH(pymalloc,
            AS_HELP_STRING([--with-pymalloc], [enable specialized mallocs (default is yes)]))

if test -z "$with_pymalloc"
then
  dnl default to yes except for wasm32-emscripten
  AS_CASE([$ac_sys_system],
    [Emscripten], [with_pymalloc="no"],
    [with_pymalloc="yes"]
  )
fi
if test "$with_pymalloc" != "no"
then
    AC_DEFINE(WITH_PYMALLOC, 1,
     [Define if you want to compile in Python-specific mallocs])
fi
AC_MSG_RESULT($with_pymalloc)

# Check whether objects such as float, tuple and dict are using
# freelists to optimization memory allocation.
AC_MSG_CHECKING(for --with-freelists)
AC_ARG_WITH(freelists,
            AS_HELP_STRING([--with-freelists], [enable object freelists (default is yes)]))

if test -z "$with_freelists"
then
    with_freelists="yes"
fi
if test "$with_freelists" != "no"
then
    AC_DEFINE(WITH_FREELISTS, 1,
     [Define if you want to compile in object freelists optimization])
fi
AC_MSG_RESULT($with_freelists)

# Check for --with-c-locale-coercion
AC_MSG_CHECKING(for --with-c-locale-coercion)
AC_ARG_WITH(c-locale-coercion,
            AS_HELP_STRING([--with-c-locale-coercion],
              [enable C locale coercion to a UTF-8 based locale (default is yes)]))

if test -z "$with_c_locale_coercion"
then
    with_c_locale_coercion="yes"
fi
if test "$with_c_locale_coercion" != "no"
then
    AC_DEFINE(PY_COERCE_C_LOCALE, 1,
      [Define if you want to coerce the C locale to a UTF-8 based locale])
fi
AC_MSG_RESULT($with_c_locale_coercion)

# Check for Valgrind support
AC_MSG_CHECKING([for --with-valgrind])
AC_ARG_WITH([valgrind],
  AS_HELP_STRING([--with-valgrind], [enable Valgrind support (default is no)]),,
  with_valgrind=no)
AC_MSG_RESULT([$with_valgrind])
if test "$with_valgrind" != no; then
    AC_CHECK_HEADER([valgrind/valgrind.h],
      [AC_DEFINE([WITH_VALGRIND], 1, [Define if you want pymalloc to be disabled when running under valgrind])],
      [AC_MSG_ERROR([Valgrind support requested but headers not available])]
    )
    OPT="-DDYNAMIC_ANNOTATIONS_ENABLED=1 $OPT"
fi

# Check for DTrace support
AC_MSG_CHECKING(for --with-dtrace)
AC_ARG_WITH(dtrace,
  AS_HELP_STRING([--with-dtrace],[enable DTrace support (default is no)]),,
  with_dtrace=no)
AC_MSG_RESULT($with_dtrace)

AC_SUBST(DTRACE)
AC_SUBST(DFLAGS)
AC_SUBST(DTRACE_HEADERS)
AC_SUBST(DTRACE_OBJS)
DTRACE=
DTRACE_HEADERS=
DTRACE_OBJS=

if test "$with_dtrace" = "yes"
then
    AC_PATH_PROG(DTRACE, [dtrace], [not found])
    if test "$DTRACE" = "not found"; then
        AC_MSG_ERROR([dtrace command not found on \$PATH])
    fi
    AC_DEFINE(WITH_DTRACE, 1, [Define if you want to compile in DTrace support])
    DTRACE_HEADERS="Include/pydtrace_probes.h"

    # On OS X, DTrace providers do not need to be explicitly compiled and
    # linked into the binary. Correspondingly, dtrace(1) is missing the ELF
    # generation flag '-G'. We check for presence of this flag, rather than
    # hardcoding support by OS, in the interest of robustness.
    AC_CACHE_CHECK([whether DTrace probes require linking],
        [ac_cv_dtrace_link], [dnl
            ac_cv_dtrace_link=no
            echo 'BEGIN{}' > conftest.d
            "$DTRACE" $DFLAGS -G -s conftest.d -o conftest.o > /dev/null 2>&1 && \
                ac_cv_dtrace_link=yes
      ])
    if test "$ac_cv_dtrace_link" = "yes"; then
        DTRACE_OBJS="Python/pydtrace.o"
    fi
fi

# -I${DLINCLDIR} is added to the compile rule for importdl.o
AC_SUBST(DLINCLDIR)
DLINCLDIR=.

# the dlopen() function means we might want to use dynload_shlib.o. some
# platforms have dlopen(), but don't want to use it.
AC_CHECK_FUNCS(dlopen)

# DYNLOADFILE specifies which dynload_*.o file we will use for dynamic
# loading of modules.
AC_SUBST(DYNLOADFILE)
AC_MSG_CHECKING(DYNLOADFILE)
if test -z "$DYNLOADFILE"
then
	case $ac_sys_system/$ac_sys_release in
	hp*|HP*) DYNLOADFILE="dynload_hpux.o";;
	*)
	# use dynload_shlib.c and dlopen() if we have it; otherwise stub
	# out any dynamic loading
	if test "$ac_cv_func_dlopen" = yes
	then DYNLOADFILE="dynload_shlib.o"
	else DYNLOADFILE="dynload_stub.o"
	fi
	;;
	esac
fi
AC_MSG_RESULT($DYNLOADFILE)
if test "$DYNLOADFILE" != "dynload_stub.o"
then
	AC_DEFINE(HAVE_DYNAMIC_LOADING, 1,
        [Defined when any dynamic module loading is enabled.])
fi

# MACHDEP_OBJS can be set to platform-specific object files needed by Python

AC_SUBST(MACHDEP_OBJS)
AC_MSG_CHECKING(MACHDEP_OBJS)
if test -z "$MACHDEP_OBJS"
then
	MACHDEP_OBJS=$extra_machdep_objs
else
	MACHDEP_OBJS="$MACHDEP_OBJS $extra_machdep_objs"
fi
if test -z "$MACHDEP_OBJS"; then
  AC_MSG_RESULT([none])
else
  AC_MSG_RESULT([$MACHDEP_OBJS])
fi

# checks for library functions
AC_CHECK_FUNCS([ \
  accept4 alarm bind_textdomain_codeset chown clock close_range confstr \
  copy_file_range ctermid dup3 execv explicit_bzero explicit_memset \
  faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
  fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
  gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
  getgrnam_r getgrouplist getgroups getitimer getloadavg getlogin \
  getpeername getpgid getpid getppid getpriority _getpty \
  getpwent getpwnam_r getpwuid_r getresgid getresuid getsid getspent \
  getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
  lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
  mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
  pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
  pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
  rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
  sched_setparam sched_setscheduler sem_clockwait sem_getvalue sem_open \
  sem_timedwait sem_unlink sendfile setegid seteuid setgid sethostname \
  setitimer setlocale setpgid setpgrp setpriority setregid setresgid \
  setresuid setreuid setsid setuid setvbuf shutdown sigaction sigaltstack \
  sigfillset siginterrupt sigpending sigrelse sigtimedwait sigwait \
  sigwaitinfo snprintf splice strftime strlcpy strsignal symlinkat sync \
  sysconf system tcgetpgrp tcsetpgrp tempnam timegm times tmpfile \
  tmpnam tmpnam_r truncate ttyname uname unlinkat utimensat utimes vfork \
  wait wait3 wait4 waitid waitpid wcscoll wcsftime wcsxfrm wmemcmp writev \
])

# Force lchmod off for Linux. Linux disallows changing the mode of symbolic
# links. Some libc implementations have a stub lchmod implementation that always
# returns an error.
if test "$MACHDEP" != linux; then
  AC_CHECK_FUNCS(lchmod)
fi

AC_CHECK_DECL(dirfd,
    AC_DEFINE(HAVE_DIRFD, 1,
              Define if you have the 'dirfd' function or macro.), ,
      [#include <sys/types.h>
       #include <dirent.h>])

dnl PY_CHECK_FUNC(FUNCTION, [INCLUDES], [AC_DEFINE-VAR])
AC_DEFUN([PY_CHECK_FUNC],
[ AS_VAR_PUSHDEF([py_var], [ac_cv_func_$1])
  AS_VAR_PUSHDEF([py_define], m4_ifblank([$3], [[HAVE_]m4_toupper($1)], [$3]))
  AC_CACHE_CHECK(
    [for $1],
    [py_var],
    [AC_COMPILE_IFELSE(
      [AC_LANG_PROGRAM([$2], [void *x=$1])],
      [AS_VAR_SET([py_var], [yes])],
      [AS_VAR_SET([py_var], [no])])]
  )
  AS_VAR_IF(
    [py_var],
    [yes],
    [AC_DEFINE([py_define], [1], [Define if you have the '$1' function.])])
  AS_VAR_POPDEF([py_var])
  AS_VAR_POPDEF([py_define])
])

# For some functions, having a definition is not sufficient, since
# we want to take their address.
PY_CHECK_FUNC([chroot], [#include <unistd.h>])
PY_CHECK_FUNC([link], [#include <unistd.h>])
PY_CHECK_FUNC([symlink], [#include <unistd.h>])
PY_CHECK_FUNC([fchdir], [#include <unistd.h>])
PY_CHECK_FUNC([fsync], [#include <unistd.h>])
PY_CHECK_FUNC([fdatasync], [#include <unistd.h>])
PY_CHECK_FUNC([epoll], [#include <sys/epoll.h>])
PY_CHECK_FUNC([epoll_create1], [#include <sys/epoll.h>])
PY_CHECK_FUNC([kqueue],[
#include <sys/types.h>
#include <sys/event.h>
])
PY_CHECK_FUNC([prlimit], [
#include <sys/time.h>
#include <sys/resource.h>
])

PY_CHECK_FUNC([_dyld_shared_cache_contains_path], [#include <mach-o/dyld.h>], [HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH])

PY_CHECK_FUNC([memfd_create], [
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_SYS_MEMFD_H
#include <sys/memfd.h>
#endif
])

PY_CHECK_FUNC([eventfd], [
#ifdef HAVE_SYS_EVENTFD_H
#include <sys/eventfd.h>
#endif
])

# On some systems (eg. FreeBSD 5), we would find a definition of the
# functions ctermid_r, setgroups in the library, but no prototype
# (e.g. because we use _XOPEN_SOURCE). See whether we can take their
# address to avoid compiler warnings and potential miscompilations
# because of the missing prototypes.

PY_CHECK_FUNC([ctermid_r], [#include <stdio.h>])

AC_CACHE_CHECK([for flock declaration], [ac_cv_flock_decl],
  [AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
      [#include <sys/file.h>],
      [void* p = flock]
    )],
    [ac_cv_flock_decl=yes],
    [ac_cv_flock_decl=no]
  )
])
dnl Linking with libbsd may be necessary on AIX for flock function.
AS_VAR_IF([ac_cv_flock_decl], [yes],
  AC_CHECK_FUNCS([flock])
  AC_CHECK_LIB([bsd], [flock], [FCNTL_LIBS="-lbsd"])
)

PY_CHECK_FUNC([getpagesize], [#include <unistd.h>])

AC_CACHE_CHECK([for broken unsetenv], [ac_cv_broken_unsetenv],
  [AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
      [#include <stdlib.h>],
      [int res = unsetenv("DUMMY")])],
    [ac_cv_broken_unsetenv=no],
    [ac_cv_broken_unsetenv=yes]
  )
])
AS_VAR_IF([ac_cv_broken_unsetenv], [yes], [
  AC_DEFINE(HAVE_BROKEN_UNSETENV, 1, [Define if 'unsetenv' does not return an int.])
])

dnl check for true
AC_CHECK_PROGS(TRUE, true, /bin/true)

dnl On some systems (e.g. Solaris 9), hstrerror and inet_aton are in -lresolv
dnl On others, they are in the C library, so we to take no action
AC_CHECK_LIB(c, inet_aton, [$ac_cv_prog_TRUE],
  AC_CHECK_LIB(resolv, inet_aton)
)

# On Tru64, chflags seems to be present, but calling it will
# exit Python
AC_CACHE_CHECK([for chflags], [ac_cv_have_chflags], [dnl
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/stat.h>
#include <unistd.h>
int main(int argc, char*argv[])
{
  if(chflags(argv[0], 0) != 0)
    return 1;
  return 0;
}
]])],
[ac_cv_have_chflags=yes],
[ac_cv_have_chflags=no],
[ac_cv_have_chflags=cross])
])
if test "$ac_cv_have_chflags" = cross ; then
  AC_CHECK_FUNC([chflags], [ac_cv_have_chflags="yes"], [ac_cv_have_chflags="no"])
fi
if test "$ac_cv_have_chflags" = yes ; then
  AC_DEFINE(HAVE_CHFLAGS, 1, [Define to 1 if you have the 'chflags' function.])
fi

AC_CACHE_CHECK([for lchflags], [ac_cv_have_lchflags], [dnl
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/stat.h>
#include <unistd.h>
int main(int argc, char*argv[])
{
  if(lchflags(argv[0], 0) != 0)
    return 1;
  return 0;
}
]])],[ac_cv_have_lchflags=yes],[ac_cv_have_lchflags=no],[ac_cv_have_lchflags=cross])
])
if test "$ac_cv_have_lchflags" = cross ; then
  AC_CHECK_FUNC([lchflags], [ac_cv_have_lchflags="yes"], [ac_cv_have_lchflags="no"])
fi
if test "$ac_cv_have_lchflags" = yes ; then
  AC_DEFINE(HAVE_LCHFLAGS, 1, [Define to 1 if you have the 'lchflags' function.])
fi

dnl Check for compression libraries
AH_TEMPLATE([HAVE_ZLIB_COPY], [Define if the zlib library has inflateCopy])

PKG_CHECK_MODULES([ZLIB], [zlib >= 1.2.0], [
  have_zlib=yes
  dnl zlib 1.2.0 (2003) added inflateCopy
  AC_DEFINE([HAVE_ZLIB_COPY], [1])
], [
  AC_CHECK_HEADERS([zlib.h], [
    WITH_SAVE_ENV([
      AC_CHECK_LIB([z], [gzread], [
        have_zlib=yes
        ZLIB_CFLAGS=${ZLIB_CFLAGS-""}