path: root/unix/configure.in

#! /bin/bash -norc
dnl	This file is an input file used by the GNU "autoconf" program to
dnl	generate the file "configure", which is run during Tcl installation
dnl	to configure the system for the local environment.
#
# RCS: @(#) $Id: configure.in,v 1.180.2.6 2008/08/13 23:07:16 das Exp $

AC_INIT([tcl],[8.5])
AC_PREREQ(2.59)

dnl This is only used when included from macosx/configure.ac
m4_ifdef([SC_USE_CONFIG_HEADERS], [
    AC_CONFIG_HEADERS([tclConfig.h:../unix/tclConfig.h.in])
    AC_CONFIG_COMMANDS_PRE([DEFS="-DHAVE_TCL_CONFIG_H  -imacros tclConfig.h"])
    AH_TOP([
    #ifndef _TCLCONFIG
    #define _TCLCONFIG])
    AH_BOTTOM([
    /* Undef unused package specific autoheader defines so that we can
     * include both tclConfig.h and tkConfig.h at the same time: */
    /* override */ #undef PACKAGE_NAME
    /* override */ #undef PACKAGE_STRING
    /* override */ #undef PACKAGE_TARNAME
    #endif /* _TCLCONFIG */])
])

TCL_VERSION=8.5
TCL_MAJOR_VERSION=8
TCL_MINOR_VERSION=5
TCL_PATCH_LEVEL=".4"
VERSION=${TCL_VERSION}

#------------------------------------------------------------------------
# Handle the --prefix=... option
#------------------------------------------------------------------------

if test "${prefix}" = "NONE"; then
    prefix=/usr/local
fi
if test "${exec_prefix}" = "NONE"; then
    exec_prefix=$prefix
fi
# Make sure srcdir is fully qualified!
srcdir="`cd "$srcdir" ; pwd`"
TCL_SRC_DIR="`cd "$srcdir"/..; pwd`"

#------------------------------------------------------------------------
# Compress and/or soft link the manpages?
#------------------------------------------------------------------------

SC_CONFIG_MANPAGES

#------------------------------------------------------------------------
# Standard compiler checks
#------------------------------------------------------------------------

# If the user did not set CFLAGS, set it now to keep
# the AC_PROG_CC macro from adding "-g -O2".
if test "${CFLAGS+set}" != "set" ; then
    CFLAGS=""
fi

AC_PROG_CC
AC_C_INLINE

#--------------------------------------------------------------------
# Supply substitutes for missing POSIX header files.  Special notes:
#	- stdlib.h doesn't define strtol, strtoul, or
#	  strtod insome versions of SunOS
#	- some versions of string.h don't declare procedures such
#	  as strstr
# Do this early, otherwise an autoconf bug throws errors on configure
#--------------------------------------------------------------------

SC_MISSING_POSIX_HEADERS

#------------------------------------------------------------------------
# If we're using GCC, see if the compiler understands -pipe.  If so, use it.
# It makes compiling go faster.  (This is only a performance feature.)
#------------------------------------------------------------------------

if test -z "$no_pipe" && test -n "$GCC"; then
    AC_CACHE_CHECK([if the compiler understands -pipe],
	tcl_cv_cc_pipe, [
	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -pipe"
	AC_TRY_COMPILE(,, tcl_cv_cc_pipe=yes, tcl_cv_cc_pipe=no)
	CFLAGS=$hold_cflags])
    if test $tcl_cv_cc_pipe = yes; then
	CFLAGS="$CFLAGS -pipe"
    fi
fi

#------------------------------------------------------------------------
# Threads support
#------------------------------------------------------------------------

SC_ENABLE_THREADS

#------------------------------------------------------------------------
# Embedded configuration information, encoding to use for the values, TIP #59
#------------------------------------------------------------------------

SC_TCL_CFG_ENCODING

#--------------------------------------------------------------------
# Look for libraries that we will need when compiling the Tcl shell
#--------------------------------------------------------------------

SC_TCL_LINK_LIBS

# Add the threads support libraries
LIBS="$LIBS$THREADS_LIBS"

SC_ENABLE_SHARED

#--------------------------------------------------------------------
# The statements below define a collection of compile flags.  This
# macro depends on the value of SHARED_BUILD, and should be called
# after SC_ENABLE_SHARED checks the configure switches.
#--------------------------------------------------------------------

SC_CONFIG_CFLAGS

SC_ENABLE_SYMBOLS(bccdebug)

AC_DEFINE(TCL_TOMMATH, 1, [Build libtommath?])
AC_DEFINE(MP_PREC, 4, [Default libtommath precision.])

#--------------------------------------------------------------------
#	Detect what compiler flags to set for 64-bit support.
#--------------------------------------------------------------------

SC_TCL_EARLY_FLAGS

SC_TCL_64BIT_FLAGS

#--------------------------------------------------------------------
#	Check endianness because we can optimize comparisons of
#	Tcl_UniChar strings to memcmp on big-endian systems.
#--------------------------------------------------------------------

AC_C_BIGENDIAN

#--------------------------------------------------------------------
#	Supply substitutes for missing POSIX library procedures, or
#	set flags so Tcl uses alternate procedures.
#--------------------------------------------------------------------

# Check if Posix compliant getcwd exists, if not we'll use getwd.
AC_CHECK_FUNCS(getcwd, , [AC_DEFINE(USEGETWD, 1, [Is getcwd Posix-compliant?])])
# Nb: if getcwd uses popen and pwd(1) (like SunOS 4) we should really
# define USEGETWD even if the posix getcwd exists. Add a test ?

AC_REPLACE_FUNCS(opendir strtol waitpid)
AC_CHECK_FUNC(strerror, , [AC_DEFINE(NO_STRERROR, 1, [Do we have strerror()])])
AC_CHECK_FUNC(getwd, , [AC_DEFINE(NO_GETWD, 1, [Do we have getwd()])])
AC_CHECK_FUNC(wait3, , [AC_DEFINE(NO_WAIT3, 1, [Do we have wait3()])])
AC_CHECK_FUNC(uname, , [AC_DEFINE(NO_UNAME, 1, [Do we have uname()])])

if test "`uname -s`" = "Darwin" && test "${TCL_THREADS}" = 1 && \
	test "`uname -r | awk -F. '{print [$]1}'`" -lt 7; then
    # prior to Darwin 7, realpath is not threadsafe, so don't
    # use it when threads are enabled, c.f. bug # 711232
    ac_cv_func_realpath=no
fi
AC_CHECK_FUNC(realpath, , [AC_DEFINE(NO_REALPATH, 1, [Do we have realpath()])])

SC_TCL_GETADDRINFO

#-------------------------------------------------------------------- 
#	Look for thread-safe variants of some library functions.
#--------------------------------------------------------------------

if test "${TCL_THREADS}" = 1; then
    SC_TCL_GETPWUID_R
    SC_TCL_GETPWNAM_R
    SC_TCL_GETGRGID_R
    SC_TCL_GETGRNAM_R
    if test "`uname -s`" = "Darwin" && \
	    test "`uname -r | awk -F. '{print [$]1}'`" -gt 5; then
	# Starting with Darwin 6 (Mac OSX 10.2), gethostbyX
	# are actually MT-safe as they always return pointers
	# from TSD instead of static storage.
	AC_DEFINE(HAVE_MTSAFE_GETHOSTBYNAME, 1,
		[Do we have MT-safe gethostbyname() ?])
	AC_DEFINE(HAVE_MTSAFE_GETHOSTBYADDR, 1,
		[Do we have MT-safe gethostbyaddr() ?])

    elif test "`uname -s`" = "HP-UX" && \
	      test "`uname -r|sed -e 's|B\.||' -e 's|\..*$||'`" -gt 10; then
        # Starting with HPUX 11.00 (we believe), gethostbyX
        # are actually MT-safe as they always return pointers
	# from TSD instead of static storage.
	AC_DEFINE(HAVE_MTSAFE_GETHOSTBYNAME, 1,
		[Do we have MT-safe gethostbyname() ?])
	AC_DEFINE(HAVE_MTSAFE_GETHOSTBYADDR, 1,
		[Do we have MT-safe gethostbyaddr() ?])

    else
	SC_TCL_GETHOSTBYNAME_R
	SC_TCL_GETHOSTBYADDR_R
    fi
fi

#---------------------------------------------------------------------------
#	Determine which interface to use to talk to the serial port.
#	Note that #include lines must begin in leftmost column for
#	some compilers to recognize them as preprocessor directives.
#---------------------------------------------------------------------------

SC_SERIAL_PORT

#--------------------------------------------------------------------
#	Include sys/select.h if it exists and if it supplies things
#	that appear to be useful and aren't already in sys/types.h.
#	This appears to be true only on the RS/6000 under AIX.  Some
#	systems like OSF/1 have a sys/select.h that's of no use, and
#	other systems like SCO UNIX have a sys/select.h that's
#	pernicious.  If "fd_set" isn't defined anywhere then set a
#	special flag.
#--------------------------------------------------------------------

AC_CACHE_CHECK([for fd_set in sys/types], tcl_cv_type_fd_set, [
    AC_TRY_COMPILE([#include <sys/types.h>],[fd_set readMask, writeMask;],
	tcl_cv_type_fd_set=yes, tcl_cv_type_fd_set=no)])
tcl_ok=$tcl_cv_type_fd_set
if test $tcl_ok = no; then
    AC_CACHE_CHECK([for fd_mask in sys/select], tcl_cv_grep_fd_mask, [
	AC_EGREP_HEADER(fd_mask, sys/select.h,
	     tcl_cv_grep_fd_mask=present, tcl_cv_grep_fd_mask=missing)])
    if test $tcl_cv_grep_fd_mask = present; then
	AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Should we include <sys/select.h>?])
	tcl_ok=yes
    fi
fi
if test $tcl_ok = no; then
    AC_DEFINE(NO_FD_SET, 1, [Do we have fd_set?])
fi

#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------

SC_TIME_HANDLER

#--------------------------------------------------------------------
#	Some systems (e.g., IRIX 4.0.5) lack the st_blksize field
#	in struct stat.  But we might be able to use fstatfs instead.
#--------------------------------------------------------------------

AC_STRUCT_ST_BLKSIZE
AC_CHECK_FUNC(fstatfs, , [AC_DEFINE(NO_FSTATFS, 1, [Do we have fstatfs()?])])

#--------------------------------------------------------------------
#       Some system have no memcmp or it does not work with 8 bit
#       data, this checks it and add memcmp.o to LIBOBJS if needed
#--------------------------------------------------------------------

AC_FUNC_MEMCMP

#--------------------------------------------------------------------
#       Some system like SunOS 4 and other BSD like systems
#       have no memmove (we assume they have bcopy instead).
#       {The replacement define is in compat/string.h}
#--------------------------------------------------------------------

AC_CHECK_FUNC(memmove, , [
    AC_DEFINE(NO_MEMMOVE, 1, [Do we have memmove()?])
    AC_DEFINE(NO_STRING_H, 1, [Do we have <string.h>?]) ])

#--------------------------------------------------------------------
#	On some systems strstr is broken: it returns a pointer even
#	even if the original string is empty.
#--------------------------------------------------------------------

SC_TCL_CHECK_BROKEN_FUNC(strstr, [
    extern int strstr();
    exit(strstr("\0test", "test") ? 1 : 0);
])

#--------------------------------------------------------------------
#	Check for strtoul function.  This is tricky because under some
#	versions of AIX strtoul returns an incorrect terminator
#	pointer for the string "0".
#--------------------------------------------------------------------

SC_TCL_CHECK_BROKEN_FUNC(strtoul, [
    extern int strtoul();
    char *term, *string = "0";
    exit(strtoul(string,&term,0) != 0 || term != string+1);
])

#--------------------------------------------------------------------
#	Check for the strtod function.  This is tricky because in some
#	versions of Linux strtod mis-parses strings starting with "+".
#--------------------------------------------------------------------

SC_TCL_CHECK_BROKEN_FUNC(strtod, [
    extern double strtod();
    char *term, *string = " +69";
    exit(strtod(string,&term) != 69 || term != string+4);
])

#--------------------------------------------------------------------
#	Under Solaris 2.4, strtod returns the wrong value for the
#	terminating character under some conditions.  Check for this
#	and if the problem exists use a substitute procedure
#	"fixstrtod" that corrects the error.
#--------------------------------------------------------------------

SC_BUGGY_STRTOD

#--------------------------------------------------------------------
#	Check for various typedefs and provide substitutes if
#	they don't exist.
#--------------------------------------------------------------------

AC_TYPE_MODE_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_UID_T

AC_CACHE_CHECK([for socklen_t], tcl_cv_type_socklen_t, [
    AC_TRY_COMPILE([
	#include <sys/types.h>
	#include <sys/socket.h>
    ],[
    	socklen_t foo;
    ],[tcl_cv_type_socklen_t=yes],[tcl_cv_type_socklen_t=no])])
if test $tcl_cv_type_socklen_t = no; then
    AC_DEFINE(socklen_t, int, [Define as int if socklen_t is not available])
fi

AC_CHECK_TYPE([intptr_t], [
    AC_DEFINE([HAVE_INTPTR_T], 1, [Do we have the intptr_t type?])], [
    AC_CACHE_CHECK([for pointer-size signed integer type], tcl_cv_intptr_t, [
    for tcl_cv_intptr_t in "int" "long" "long long" none; do
	if test "$tcl_cv_intptr_t" != none; then
	    AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([AC_INCLUDES_DEFAULT],
		    [[sizeof (void *) <= sizeof ($tcl_cv_intptr_t)]])], 
		[tcl_ok=yes], [tcl_ok=no])
	    test "$tcl_ok" = yes && break; fi
    done])
    if test "$tcl_cv_intptr_t" != none; then
	AC_DEFINE_UNQUOTED([intptr_t], [$tcl_cv_intptr_t], [Signed integer
	   type wide enough to hold a pointer.])
    fi
])
AC_CHECK_TYPE([uintptr_t], [
    AC_DEFINE([HAVE_UINTPTR_T], 1, [Do we have the uintptr_t type?])], [
    AC_CACHE_CHECK([for pointer-size unsigned integer type], tcl_cv_uintptr_t, [
    for tcl_cv_uintptr_t in "unsigned int" "unsigned long" "unsigned long long" \
	    none; do
	if test "$tcl_cv_uintptr_t" != none; then
	    AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([AC_INCLUDES_DEFAULT],
		    [[sizeof (void *) <= sizeof ($tcl_cv_uintptr_t)]])], 
		[tcl_ok=yes], [tcl_ok=no])
	    test "$tcl_ok" = yes && break; fi
    done])
    if test "$tcl_cv_uintptr_t" != none; then
	AC_DEFINE_UNQUOTED([uintptr_t], [$tcl_cv_uintptr_t], [Unsigned integer
	   type wide enough to hold a pointer.])
    fi
])

#--------------------------------------------------------------------
#	If a system doesn't have an opendir function (man, that's old!)
#	then we have to supply a different version of dirent.h which
#	is compatible with the substitute version of opendir that's
#	provided.  This version only works with V7-style directories.
#--------------------------------------------------------------------

AC_CHECK_FUNC(opendir, , [AC_DEFINE(USE_DIRENT2_H, 1, [May we include <dirent2.h>?])])

#--------------------------------------------------------------------
#	The check below checks whether <sys/wait.h> defines the type
#	"union wait" correctly.  It's needed because of weirdness in
#	HP-UX where "union wait" is defined in both the BSD and SYS-V
#	environments.  Checking the usability of WIFEXITED seems to do
#	the trick.
#--------------------------------------------------------------------

AC_CACHE_CHECK([union wait], tcl_cv_union_wait, [
    AC_TRY_LINK([#include <sys/types.h> 
#include <sys/wait.h>], [
union wait x;
WIFEXITED(x);		/* Generates compiler error if WIFEXITED
			 * uses an int. */
    ], tcl_cv_union_wait=yes, tcl_cv_union_wait=no)])
if test $tcl_cv_union_wait = no; then
    AC_DEFINE(NO_UNION_WAIT, 1, [Do we have a usable 'union wait'?])
fi

#--------------------------------------------------------------------
#	Check whether there is an strncasecmp function on this system.
#	This is a bit tricky because under SCO it's in -lsocket and
#	under Sequent Dynix it's in -linet.
#--------------------------------------------------------------------

AC_CHECK_FUNC(strncasecmp, tcl_ok=1, tcl_ok=0)
if test "$tcl_ok" = 0; then
    AC_CHECK_LIB(socket, strncasecmp, tcl_ok=1, tcl_ok=0)
fi
if test "$tcl_ok" = 0; then
    AC_CHECK_LIB(inet, strncasecmp, tcl_ok=1, tcl_ok=0)
fi
if test "$tcl_ok" = 0; then
    AC_LIBOBJ([strncasecmp])
    USE_COMPAT=1
fi

#--------------------------------------------------------------------
#	The code below deals with several issues related to gettimeofday:
#	1. Some systems don't provide a gettimeofday function at all
#	   (set NO_GETTOD if this is the case).
#	2. SGI systems don't use the BSD form of the gettimeofday function,
#	   but they have a BSDgettimeofday function that can be used instead.
#	3. See if gettimeofday is declared in the <sys/time.h> header file.
#	   if not, set the GETTOD_NOT_DECLARED flag so that tclPort.h can
#	   declare it.
#--------------------------------------------------------------------

AC_CHECK_FUNC(BSDgettimeofday,
    [AC_DEFINE(HAVE_BSDGETTIMEOFDAY, 1, [Do we have BSDgettimeofday()?])], [
    AC_CHECK_FUNC(gettimeofday, , [AC_DEFINE(NO_GETTOD, 1, [Do we have gettimeofday()?])])
])
AC_CACHE_CHECK([for gettimeofday declaration], tcl_cv_grep_gettimeofday, [
    AC_EGREP_HEADER(gettimeofday, sys/time.h,
	tcl_cv_grep_gettimeofday=present, tcl_cv_grep_gettimeofday=missing)])
if test $tcl_cv_grep_gettimeofday = missing ; then
    AC_DEFINE(GETTOD_NOT_DECLARED, 1, [Is gettimeofday() actually declared in <sys/time.h>?])
fi

#--------------------------------------------------------------------
#	The following code checks to see whether it is possible to get
#	signed chars on this platform.  This is needed in order to
#	properly generate sign-extended ints from character values.
#--------------------------------------------------------------------

AC_C_CHAR_UNSIGNED
AC_CACHE_CHECK([signed char declarations], tcl_cv_char_signed, [
    AC_TRY_COMPILE(, [
	signed char *p;
	p = 0;
	], tcl_cv_char_signed=yes, tcl_cv_char_signed=no)])
if test $tcl_cv_char_signed = yes; then
    AC_DEFINE(HAVE_SIGNED_CHAR, 1, [Are characters signed?])
fi

#--------------------------------------------------------------------
#  Does putenv() copy or not?  We need to know to avoid memory leaks.
#--------------------------------------------------------------------

AC_CACHE_CHECK([for a putenv() that copies the buffer], tcl_cv_putenv_copy, [
    AC_TRY_RUN([
	#include <stdlib.h>
	#define OURVAR "havecopy=yes"
	int main (int argc, char *argv[])
	{
	    char *foo, *bar;
	    foo = (char *)strdup(OURVAR);
	    putenv(foo);
	    strcpy((char *)(strchr(foo, '=') + 1), "no");
	    bar = getenv("havecopy");
	    if (!strcmp(bar, "no")) {
		/* doesnt copy */
		return 0;
	    } else {
		/* does copy */
		return 1;
	    }
	}
    ],
    tcl_cv_putenv_copy=no,
    tcl_cv_putenv_copy=yes,
    tcl_cv_putenv_copy=no)])
if test $tcl_cv_putenv_copy = yes; then
    AC_DEFINE(HAVE_PUTENV_THAT_COPIES, 1,
	[Does putenv() copy strings or incorporate them by reference?])
fi

#--------------------------------------------------------------------
# Check for support of nl_langinfo function
#--------------------------------------------------------------------

SC_ENABLE_LANGINFO

#--------------------------------------------------------------------
# Check for support of chflags function
#--------------------------------------------------------------------

AC_CHECK_FUNCS(chflags)

#--------------------------------------------------------------------
# Check for support of isnan() function or macro
#--------------------------------------------------------------------

AC_CACHE_CHECK([isnan], tcl_cv_isnan, [
    AC_TRY_LINK([#include <math.h>], [
isnan(0.0);			/* Generates an error if isnan is missing */
], tcl_cv_isnan=yes, tcl_cv_isnan=no)])
if test $tcl_cv_isnan = no; then
    AC_DEFINE(NO_ISNAN, 1, [Do we have a usable 'isnan'?])
fi

#--------------------------------------------------------------------
# Darwin specific API checks and defines
#--------------------------------------------------------------------

if test "`uname -s`" = "Darwin" ; then
    AC_CHECK_FUNCS(getattrlist)
    AC_CHECK_HEADERS(copyfile.h)
    AC_CHECK_FUNCS(copyfile)
    if test $tcl_corefoundation = yes; then
	AC_CHECK_HEADERS(libkern/OSAtomic.h)
	AC_CHECK_FUNCS(OSSpinLockLock)
	AC_CHECK_FUNCS(pthread_atfork)
    fi
    AC_DEFINE(USE_VFORK, 1, [Should we use vfork() instead of fork()?])
    AC_DEFINE(TCL_DEFAULT_ENCODING, "utf-8",
	[Are we to override what our default encoding is?])
    AC_DEFINE(TCL_LOAD_FROM_MEMORY, 1,
	[Can this platform load code from memory?])
    AC_DEFINE(TCL_WIDE_CLICKS, 1,
	[Does this platform have wide high-resolution clicks?])
    AC_CHECK_HEADERS(AvailabilityMacros.h)
    if test "$ac_cv_header_AvailabilityMacros_h" = yes; then
	AC_CACHE_CHECK([if weak import is available], tcl_cv_cc_weak_import, [
	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
	    AC_TRY_LINK([
		    #ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
		    #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
		    #error __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
		    #endif
		    #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1020
		    #error MAC_OS_X_VERSION_MIN_REQUIRED < 1020
		    #endif
		    int rand(void) __attribute__((weak_import));
		], [rand();],
		tcl_cv_cc_weak_import=yes, tcl_cv_cc_weak_import=no)
	    CFLAGS=$hold_cflags])
	if test $tcl_cv_cc_weak_import = yes; then
	    AC_DEFINE(HAVE_WEAK_IMPORT, 1, [Is weak import available?])
	fi
    fi
    # Build .bundle dltest binaries in addition to .dylib
    DLTEST_LD='${CC} -bundle -Wl,-w ${CFLAGS} ${LDFLAGS}'
    DLTEST_SUFFIX=".bundle"
else
    DLTEST_LD='${SHLIB_LD}'
    DLTEST_SUFFIX=""
fi

#--------------------------------------------------------------------
# Check for support of fts functions (readdir replacement)
#--------------------------------------------------------------------

AC_CACHE_CHECK([for fts], tcl_cv_api_fts, [
    AC_TRY_LINK([
	    #include <sys/param.h>
	    #include <sys/stat.h>
	    #include <fts.h>
	], [
	    char*const p[2] = {"/", NULL};
	    FTS *f = fts_open(p, FTS_PHYSICAL|FTS_NOCHDIR|FTS_NOSTAT, NULL);
	    FTSENT *e = fts_read(f); fts_close(f);
	], tcl_cv_api_fts=yes, tcl_cv_api_fts=no)])
if test $tcl_cv_api_fts = yes; then
    AC_DEFINE(HAVE_FTS, 1, [Do we have fts functions?])
fi

#--------------------------------------------------------------------
#	The statements below check for systems where POSIX-style
#	non-blocking I/O (O_NONBLOCK) doesn't work or is unimplemented. 
#	On these systems (mostly older ones), use the old BSD-style
#	FIONBIO approach instead.
#--------------------------------------------------------------------

SC_BLOCKING_STYLE

#------------------------------------------------------------------------

AC_MSG_CHECKING([whether to use dll unloading])
AC_ARG_ENABLE(dll-unloading,
    AC_HELP_STRING([--enable-dll-unloading],
	[enable the 'unload' command (default: on)]),
    [tcl_ok=$enableval], [tcl_ok=yes])
if test $tcl_ok = yes; then
    AC_DEFINE(TCL_UNLOAD_DLLS, 1, [Do we allow unloading of shared libraries?])
fi
AC_MSG_RESULT([$tcl_ok])

#------------------------------------------------------------------------
#	Check whether the timezone data is supplied by the OS or has
#	to be installed by Tcl. The default is autodetection, but can
#	be overriden on the configure command line either way.
#------------------------------------------------------------------------

AC_MSG_CHECKING([for timezone data])
AC_ARG_WITH(tzdata,
    AC_HELP_STRING([--with-tzdata],
	[install timezone data (default: autodetect)]),
    [tcl_ok=$withval], [tcl_ok=auto])
#
# Any directories that get added here must also be added to the
# search path in ::tcl::clock::Initialize (library/clock.tcl).
#
case $tcl_ok in 
    no)
	AC_MSG_RESULT([supplied by OS vendor])
    ;;
    yes)
	# nothing to do here
    ;;
    auto*)
	AC_CACHE_VAL([tcl_cv_dir_zoneinfo], [
	for dir in /usr/share/zoneinfo \
		/usr/share/lib/zoneinfo \
		/usr/lib/zoneinfo
	do
		if test -f $dir/UTC -o -f $dir/GMT
		then
			tcl_cv_dir_zoneinfo="$dir"
			break
		fi
	done])
	if test -n "$tcl_cv_dir_zoneinfo"; then
	    tcl_ok=no
	    AC_MSG_RESULT([$dir])
	else
	    tcl_ok=yes
	fi
    ;;
    *)
	AC_MSG_ERROR([invalid argument: $tcl_ok])	
    ;;
esac
if test $tcl_ok = yes
then
    AC_MSG_RESULT([supplied by Tcl])
    INSTALL_TZDATA=install-tzdata
fi

#--------------------------------------------------------------------
#	DTrace support
#--------------------------------------------------------------------

AC_ARG_ENABLE(dtrace,
    AC_HELP_STRING([--enable-dtrace],
	[build with DTrace support (default: off)]),
    [tcl_ok=$enableval], [tcl_ok=no])
if test $tcl_ok = yes; then
    AC_CHECK_HEADER(sys/sdt.h, [tcl_ok=yes], [tcl_ok=no])
fi
if test $tcl_ok = yes; then
    AC_PATH_PROG(DTRACE, dtrace,, [$PATH:/usr/sbin])
    test -z "$ac_cv_path_DTRACE" && tcl_ok=no
fi
AC_MSG_CHECKING([whether to enable DTrace support])
MAKEFILE_SHELL='/bin/sh'
if test $tcl_ok = yes; then
    AC_DEFINE(USE_DTRACE, 1, [Are we building with DTrace support?])
    DTRACE_SRC="\${DTRACE_SRC}"
    DTRACE_HDR="\${DTRACE_HDR}"
    if test "`uname -s`" != "Darwin" ; then
	DTRACE_OBJ="\${DTRACE_OBJ}"
	if test "`uname -s`" = "SunOS" -a "$SHARED_BUILD" = "0" ; then
	    # Need to create an intermediate object file to ensure tclDTrace.o
	    # gets included when linking against the static tcl library.
	    STLIB_LD='stlib_ld () { /usr/ccs/bin/ld -r -o $${1%.a}.o "$${@:2}" && '"${STLIB_LD}"' $${1} $${1%.a}.o ; } && stlib_ld'
	    MAKEFILE_SHELL='/bin/bash'
	    # Force use of Sun ar and ranlib, the GNU versions choke on
	    # tclDTrace.o and the combined object file above.
	    AR='/usr/ccs/bin/ar'
	    RANLIB='/usr/ccs/bin/ranlib'
	fi
    fi
fi
AC_MSG_RESULT([$tcl_ok])

#--------------------------------------------------------------------
#  Does the C stack grow upwards or downwards? Or cross-compiling?
#--------------------------------------------------------------------

AC_CACHE_CHECK([if the C stack grows upwards in memory], tcl_cv_stack_grows_up, [
    AC_TRY_RUN([
	int StackGrowsUp(int *parent) {
	    int here;
	    return (&here < parent);
	}
	int main (int argc, char *argv[]) {
	    int foo;
	    return StackGrowsUp(&foo);
	}
    ], tcl_cv_stack_grows_up=yes, tcl_cv_stack_grows_up=no,
    tcl_cv_stack_grows_up=unknown)])
if test $tcl_cv_stack_grows_up = unknown; then
    AC_DEFINE(TCL_CROSS_COMPILE, 1, [Are we cross-compiling?])
elif test $tcl_cv_stack_grows_up = yes; then
    AC_DEFINE(TCL_STACK_GROWS_UP, 1, [The C stack grows upwards in memory.])
fi

#--------------------------------------------------------------------
#	The statements below define a collection of symbols related to
#	building libtcl as a shared library instead of a static library.
#--------------------------------------------------------------------

TCL_UNSHARED_LIB_SUFFIX=${UNSHARED_LIB_SUFFIX}
TCL_SHARED_LIB_SUFFIX=${SHARED_LIB_SUFFIX}
eval "TCL_LIB_FILE=libtcl${LIB_SUFFIX}"

# tclConfig.sh needs a version of the _LIB_SUFFIX that has been eval'ed
# since on some platforms TCL_LIB_FILE contains shell escapes. 
# (See also: TCL_TRIM_DOTS).

eval "TCL_LIB_FILE=${TCL_LIB_FILE}"

TCL_LIBRARY='$(prefix)/lib/tcl$(VERSION)'
PRIVATE_INCLUDE_DIR='$(includedir)'
HTML_DIR='$(DISTDIR)/html'

# Note:  in the following variable, it's important to use the absolute
# path name of the Tcl directory rather than "..":  this is because
# AIX remembers this path and will attempt to use it at run-time to look
# up the Tcl library.

if test "`uname -s`" = "Darwin" ; then
    SC_ENABLE_FRAMEWORK
    TCL_SHLIB_LD_EXTRAS="-compatibility_version ${TCL_VERSION} -current_version ${TCL_VERSION}`echo ${TCL_PATCH_LEVEL} | awk ['{match($0, "\\\.[0-9]+"); print substr($0,RSTART,RLENGTH)}']`"
    TCL_SHLIB_LD_EXTRAS="${TCL_SHLIB_LD_EXTRAS}"' -install_name "${DYLIB_INSTALL_DIR}"/${TCL_LIB_FILE}'
    echo "$LDFLAGS " | grep -q -- '-prebind ' && TCL_SHLIB_LD_EXTRAS="${TCL_SHLIB_LD_EXTRAS}"' -seg1addr 0xa000000'
    TCL_SHLIB_LD_EXTRAS="${TCL_SHLIB_LD_EXTRAS}"' -sectcreate __TEXT __info_plist Tcl-Info.plist'
    EXTRA_TCLSH_LIBS='-sectcreate __TEXT __info_plist Tclsh-Info.plist'
    EXTRA_APP_CC_SWITCHES='-mdynamic-no-pic'
    AC_CONFIG_FILES([Tcl-Info.plist:../macosx/Tcl-Info.plist.in Tclsh-Info.plist:../macosx/Tclsh-Info.plist.in])
    TCL_YEAR="`date +%Y`"
fi

if test "$FRAMEWORK_BUILD" = "1" ; then
    AC_DEFINE(TCL_FRAMEWORK, 1, [Is Tcl built as a framework?])
    # Construct a fake local framework structure to make linking with
    # '-framework Tcl' and running of tcltest work
    AC_CONFIG_COMMANDS([Tcl.framework], [n=Tcl &&
        f=$n.framework && v=Versions/$VERSION &&
        rm -rf $f && mkdir -p $f/$v/Resources &&
        ln -s $v/$n $v/Resources $f && ln -s ../../../$n $f/$v &&
        ln -s ../../../../$n-Info.plist $f/$v/Resources/Info.plist &&
        unset n f v
    ], VERSION=${TCL_VERSION})
    LD_LIBRARY_PATH_VAR="DYLD_FRAMEWORK_PATH"
    if test "${libdir}" = '${exec_prefix}/lib'; then
        # override libdir default
        libdir="/Library/Frameworks"
    fi
    TCL_LIB_FILE="Tcl"
    TCL_LIB_FLAG="-framework Tcl"
    TCL_BUILD_LIB_SPEC="-F`pwd | sed -e 's/ /\\\\ /g'` -framework Tcl"
    TCL_LIB_SPEC="-F${libdir} -framework Tcl"
    libdir="${libdir}/Tcl.framework/Versions/\${VERSION}"
    TCL_LIBRARY="${libdir}/Resources/Scripts"
    includedir="${libdir}/Headers"
    PRIVATE_INCLUDE_DIR="${libdir}/PrivateHeaders"
    HTML_DIR="${libdir}/Resources/Documentation/Reference/Tcl"
    EXTRA_INSTALL="install-private-headers html-tcl"
    EXTRA_BUILD_HTML='@ln -fs contents.htm "$(HTML_INSTALL_DIR)"/TclTOC.html' 
    EXTRA_INSTALL_BINARIES='@echo "Installing Info.plist to $(LIB_INSTALL_DIR)/Resources" && mkdir -p "$(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) Tcl-Info.plist "$(LIB_INSTALL_DIR)/Resources/Info.plist"'
    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Installing license.terms to $(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) "$(TOP_DIR)/license.terms" "$(LIB_INSTALL_DIR)/Resources"'
    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Finalizing Tcl.framework" && rm -f "$(LIB_INSTALL_DIR)/../Current" && ln -s "$(VERSION)" "$(LIB_INSTALL_DIR)/../Current" && for f in "$(LIB_FILE)" tclConfig.sh Resources Headers PrivateHeaders; do rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/Current/$$f" "$(LIB_INSTALL_DIR)/../.."; done && f="$(STUB_LIB_FILE)" && rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/$(VERSION)/$$f" "$(LIB_INSTALL_DIR)/../.."'
    # Don't use AC_DEFINE for the following as the framework version define 
    # needs to go into the Makefile even when using autoheader, so that we  
    # can pick up a potential make override of VERSION. Also, don't put this
    # into CFLAGS as it should not go into tclConfig.sh
    EXTRA_CC_SWITCHES='-DTCL_FRAMEWORK_VERSION=\"$(VERSION)\"'
else
    # libdir must be a fully qualified path and not ${exec_prefix}/lib
    eval libdir="$libdir"
    if test "$SHARED_BUILD" = "0" || test "$TCL_NEEDS_EXP_FILE" = "0"; then
        if test "${TCL_LIB_VERSIONS_OK}" = "ok"; then
            TCL_LIB_FLAG="-ltcl${TCL_VERSION}"
        else
            TCL_LIB_FLAG="-ltcl`echo ${TCL_VERSION} | tr -d .`"
        fi
        TCL_BUILD_LIB_SPEC="-L`pwd | sed -e 's/ /\\\\ /g'` ${TCL_LIB_FLAG}"
        TCL_LIB_SPEC="-L${libdir} ${TCL_LIB_FLAG}"
    else
        TCL_BUILD_EXP_FILE="lib.exp"
        eval "TCL_EXP_FILE=libtcl${TCL_EXPORT_FILE_SUFFIX}"
    
        if test "$GCC" = "yes" ; then
            TCL_BUILD_LIB_SPEC="-Wl,-bI:`pwd | sed -e 's/ /\\\\ /g'`/${TCL_BUILD_EXP_FILE} -L`pwd | sed -e 's/ /\\\\ /g'`"
            TCL_LIB_SPEC="-Wl,-bI:${libdir}/${TCL_EXP_FILE} -L${libdir}"
        else
            TCL_BUILD_LIB_SPEC="-bI:`pwd | sed -e 's/ /\\\\ /g'`/${TCL_BUILD_EXP_FILE}"
            TCL_LIB_SPEC="-bI:${libdir}/${TCL_EXP_FILE}"
        fi
    fi
fi
VERSION='${VERSION}'
eval "CFG_TCL_SHARED_LIB_SUFFIX=${TCL_SHARED_LIB_SUFFIX}"
eval "CFG_TCL_UNSHARED_LIB_SUFFIX=${TCL_UNSHARED_LIB_SUFFIX}"
eval "CFG_TCL_EXPORT_FILE_SUFFIX=${TCL_EXPORT_FILE_SUFFIX}"
VERSION=${TCL_VERSION}

#--------------------------------------------------------------------
#	The statements below define the symbol TCL_PACKAGE_PATH, which
#	gives a list of directories that may contain packages.  The list
#	consists of one directory for machine-dependent binaries and
#	another for platform-independent scripts.
#--------------------------------------------------------------------

if test "$FRAMEWORK_BUILD" = "1" ; then
    test -z "$TCL_PACKAGE_PATH" && \
	TCL_PACKAGE_PATH="~/Library/Tcl /Library/Tcl /Network/Library/Tcl /System/Library/Tcl ~/Library/Frameworks /Library/Frameworks /Network/Library/Frameworks /System/Library/Frameworks"
    test -z "$TCL_MODULE_PATH"  && \
	TCL_MODULE_PATH="~/Library/Tcl /Library/Tcl /Network/Library/Tcl /System/Library/Tcl"
elif test "$prefix/lib" != "$libdir"; then
    TCL_PACKAGE_PATH="${libdir} ${prefix}/lib ${TCL_PACKAGE_PATH}"
else
    TCL_PACKAGE_PATH="${prefix}/lib ${TCL_PACKAGE_PATH}"
fi

#--------------------------------------------------------------------
#       The statements below define various symbols relating to Tcl
#       stub support.
#--------------------------------------------------------------------

# Replace ${VERSION} with contents of ${TCL_VERSION}
# double-eval to account for TCL_TRIM_DOTS.
#
eval "TCL_STUB_LIB_FILE=libtclstub${TCL_UNSHARED_LIB_SUFFIX}"
eval "TCL_STUB_LIB_FILE=\"${TCL_STUB_LIB_FILE}\""
eval "TCL_STUB_LIB_DIR=${libdir}"

if test "${TCL_LIB_VERSIONS_OK}" = "ok"; then
    TCL_STUB_LIB_FLAG="-ltclstub${TCL_VERSION}"
else
    TCL_STUB_LIB_FLAG="-ltclstub`echo ${TCL_VERSION} | tr -d .`"
fi

TCL_BUILD_STUB_LIB_SPEC="-L`pwd | sed -e 's/ /\\\\ /g'` ${TCL_STUB_LIB_FLAG}"
TCL_STUB_LIB_SPEC="-L${TCL_STUB_LIB_DIR} ${TCL_STUB_LIB_FLAG}"
TCL_BUILD_STUB_LIB_PATH="`pwd`/${TCL_STUB_LIB_FILE}"
TCL_STUB_LIB_PATH="${TCL_STUB_LIB_DIR}/${TCL_STUB_LIB_FILE}"

# Install time header dir can be set via --includedir
eval "TCL_INCLUDE_SPEC=\"-I${includedir}\""

#------------------------------------------------------------------------
# tclConfig.sh refers to this by a different name
#------------------------------------------------------------------------

TCL_SHARED_BUILD=${SHARED_BUILD}

AC_SUBST(TCL_VERSION)
AC_SUBST(TCL_MAJOR_VERSION)
AC_SUBST(TCL_MINOR_VERSION)
AC_SUBST(TCL_PATCH_LEVEL)
AC_SUBST(TCL_YEAR)

AC_SUBST(TCL_LIB_FILE)
AC_SUBST(TCL_LIB_FLAG)
AC_SUBST(TCL_LIB_SPEC)
AC_SUBST(TCL_STUB_LIB_FILE)
AC_SUBST(TCL_STUB_LIB_FLAG)
AC_SUBST(TCL_STUB_LIB_SPEC)
AC_SUBST(TCL_STUB_LIB_PATH)
AC_SUBST(TCL_INCLUDE_SPEC)
AC_SUBST(TCL_BUILD_STUB_LIB_SPEC)
AC_SUBST(TCL_BUILD_STUB_LIB_PATH)

AC_SUBST(TCL_SRC_DIR)
AC_SUBST(CFG_TCL_SHARED_LIB_SUFFIX)
AC_SUBST(CFG_TCL_UNSHARED_LIB_SUFFIX)
AC_SUBST(CFG_TCL_EXPORT_FILE_SUFFIX)

AC_SUBST(TCL_SHARED_BUILD)
AC_SUBST(LD_LIBRARY_PATH_VAR)

AC_SUBST(TCL_BUILD_LIB_SPEC)
AC_SUBST(TCL_NEEDS_EXP_FILE)
AC_SUBST(TCL_BUILD_EXP_FILE)
AC_SUBST(TCL_EXP_FILE)

AC_SUBST(TCL_LIB_VERSIONS_OK)
AC_SUBST(TCL_SHARED_LIB_SUFFIX)
AC_SUBST(TCL_UNSHARED_LIB_SUFFIX)

AC_SUBST(TCL_HAS_LONGLONG)

AC_SUBST(INSTALL_TZDATA)

AC_SUBST(DTRACE_SRC)
AC_SUBST(DTRACE_HDR)
AC_SUBST(DTRACE_OBJ)
AC_SUBST(MAKEFILE_SHELL)

AC_SUBST(BUILD_DLTEST)
AC_SUBST(TCL_PACKAGE_PATH)
AC_SUBST(TCL_MODULE_PATH)

AC_SUBST(TCL_LIBRARY)
AC_SUBST(PRIVATE_INCLUDE_DIR)
AC_SUBST(HTML_DIR)

AC_SUBST(EXTRA_CC_SWITCHES)
AC_SUBST(EXTRA_APP_CC_SWITCHES)
AC_SUBST(EXTRA_INSTALL)
AC_SUBST(EXTRA_INSTALL_BINARIES)
AC_SUBST(EXTRA_BUILD_HTML)
AC_SUBST(EXTRA_TCLSH_LIBS)

AC_SUBST(DLTEST_LD)
AC_SUBST(DLTEST_SUFFIX)

dnl	Disable the automake-friendly normalization of LIBOBJS
dnl	performed by autoconf 2.53 and later.  It's not correct for us.
define([_AC_LIBOBJS_NORMALIZE],[])
AC_CONFIG_FILES([
    Makefile:../unix/Makefile.in
    dltest/Makefile:../unix/dltest/Makefile.in
    tclConfig.sh:../unix/tclConfig.sh.in
])
AC_OUTPUT