path: root/unix/aclocal.m4

dnl aclocal.m4 generated automatically by aclocal 1.4a

dnl Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without
dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A
dnl PARTICULAR PURPOSE.

#------------------------------------------------------------------------
# SC_PATH_TCLCONFIG --
#
#	Locate the tclConfig.sh file and perform a sanity check on
#	the Tcl compile flags
#
# Arguments:
#	none
#
# Results:
#
#	Adds the following arguments to configure:
#		--with-tcl=...
#
#	Defines the following vars:
#		TCLCONFIG	Full path to the tclConfig.sh file
#------------------------------------------------------------------------

AC_DEFUN(SC_PATH_TCLCONFIG, [
#
# Ok, lets find the tcl configuration
# First, look for one uninstalled.
# the alternative search directory is invoked by --with-tcl
#

if test x"${no_tcl}" = x ; then
    # we reset no_tcl in case something fails here
    no_tcl=true
    AC_ARG_WITH(tcl, [  --with-tcl           directory containing tcl configuration (tclConfig.sh)],
	    with_tclconfig=${withval})
    AC_MSG_CHECKING([for Tcl configuration])
    AC_CACHE_VAL(ac_cv_c_tclconfig,[

	# First check to see if --with-tclconfig was specified.
	if test x"${with_tclconfig}" != x ; then
	    if test -f "${with_tclconfig}/tclConfig.sh" ; then
		ac_cv_c_tclconfig=`(cd ${with_tclconfig}; pwd)`
	    else
		AC_MSG_ERROR([${with_tclconfig} directory doesn't contain tclConfig.sh])
	    fi
	fi

	# then check for a private Tcl installation
	if test x"${ac_cv_c_tclconfig}" = x ; then
	    for i in \
		    ../tcl \
		    `ls -dr ../tcl[[8-9]].[[0-9]]* 2>/dev/null` \
		    ../../tcl \
		    `ls -dr ../../tcl[[8-9]].[[0-9]]* 2>/dev/null` \
		    ../../../tcl \
		    `ls -dr ../../../tcl[[8-9]].[[0-9]]* 2>/dev/null` ; do
		if test -f "$i/unix/tclConfig.sh" ; then
		    ac_cv_c_tclconfig=`(cd $i/unix; pwd)`
		    break
		fi
	    done
	fi

	# check in a few common install locations
	if test x"${ac_cv_c_tclconfig}" = x ; then
	    for i in `ls -d ${prefix}/lib 2>/dev/null` \
		    `ls -d /usr/local/lib 2>/dev/null` ; do
		if test -f "$i/tclConfig.sh" ; then
		    ac_cv_c_tclconfig=`(cd $i; pwd)`
		    break
		fi
	    done
	fi

	# check in a few other private locations
	if test x"${ac_cv_c_tcliconfig}" = x ; then
	    for i in \
		    ${srcdir}/../tcl \
		    `ls -dr ${srcdir}/../tcl[[8-9]].[[0-9]]* 2>/dev/null` ; do
		if test -f "$i/unix/tclConfig.sh" ; then
		ac_cv_c_tclconfig=`(cd $i/unix; pwd)`
		break
	    fi
	    done
	fi
    ])

    if test x"${ac_cv_c_tclconfig}" = x ; then
	TCLCONFIG="# no Tcl configs found"
	AC_MSG_WARN(Can't find Tcl configuration definitions)
	exit 0
    else
	no_tcl=
	TCLCONFIG=${ac_cv_c_tclconfig}/tclConfig.sh
	AC_MSG_RESULT(found $TCLCONFIG)
    fi
fi
])

#------------------------------------------------------------------------
# SC_PATH_TKCONFIG --
#
#	Locate the tkConfig.sh file
#
# Arguments:
#	none
#
# Results:
#
#	Adds the following arguments to configure:
#		--with-tk=...
#
#	Defines the following vars:
#		TKCONFIG	Full path to the tkConfig.sh file
#------------------------------------------------------------------------

AC_DEFUN(SC_PATH_TKCONFIG, [
#
# Ok, lets find the tk configuration
# First, look for one uninstalled.
# the alternative search directory is invoked by --with-tk
#

if test x"${no_tk}" = x ; then
  # we reset no_tk in case something fails here
  no_tk=true
  AC_ARG_WITH(tk, [  --with-tk           directory containing tk configuration (tkConfig.sh)],
         with_tkconfig=${withval})
  AC_MSG_CHECKING([for Tk configuration])
  AC_CACHE_VAL(ac_cv_c_tkconfig,[

  # First check to see if --with-tkconfig was specified.
  if test x"${with_tkconfig}" != x ; then
    if test -f "${with_tkconfig}/tkConfig.sh" ; then
      ac_cv_c_tkconfig=`(cd ${with_tkconfig}; pwd)`
    else
      AC_MSG_ERROR([${with_tkconfig} directory doesn't contain tkConfig.sh])
    fi
  fi

  # then check for a private Tk library
  if test x"${ac_cv_c_tkconfig}" = x ; then
    for i in \
                ../tk \
                `ls -dr ../tk[[8-9]].[[0-9]]* 2>/dev/null` \
                ../../tk \
                `ls -dr ../../tk[[8-9]].[[0-9]]* 2>/dev/null` \
                ../../../tk \
                `ls -dr ../../../tk[[8-9]].[[0-9]]* 2>/dev/null` ; do
      if test -f "$i/unix/tkConfig.sh" ; then
        ac_cv_c_tkconfig=`(cd $i/unix; pwd)`
        break
      fi
    done
  fi
  # check in a few common install locations
  if test x"${ac_cv_c_tkconfig}" = x ; then
    for i in `ls -d ${prefix}/lib 2>/dev/null` \
	     `ls -d /usr/local/lib 2>/dev/null` ; do
      if test -f "$i/tkConfig.sh" ; then
        ac_cv_c_tkconfig=`(cd $i; pwd)`
        break
      fi
    done
  fi
  # check in a few other private locations
  if test x"${ac_cv_c_tkconfig}" = x ; then
    for i in \
                ${srcdir}/../tk \
                `ls -dr ${srcdir}/../tk[[8-9]].[[0-9]]* 2>/dev/null` ; do
      if test -f "$i/unix/tkConfig.sh" ; then
        ac_cv_c_tkconfig=`(cd $i/unix; pwd)`
        break
      fi
    done
  fi
  ])
  if test x"${ac_cv_c_tkconfig}" = x ; then
    TKCONFIG="# no Tk configs found"
    AC_MSG_WARN(Can't find Tk configuration definitions)
    exit 0
  else
    no_tk=
    TKCONFIG=${ac_cv_c_tkconfig}/tkConfig.sh
    AC_MSG_RESULT(found $TKCONFIG)
  fi
fi

])

#------------------------------------------------------------------------
# SC_LOAD_TCLCONFIG --
#
#	Load the tclConfig.sh file
#
# Arguments:
#	
#	Requires the following vars to be set:
#		TCLCONFIG
#
# Results:
#
#	Subst's the following vars:
#		TCL_CC
#		TCL_DEFS
#		TCL_CFLAGS
#		TCL_DBGX
#		TCL_LIBS
#		TCL_SHLIB_LD
#		SHLIB_SUFFIX
#		TCL_LD_FLAGS
#		TCL_BUILD_LIB_SPEC
#		TCL_LIB_SPEC
#		TCL_SHARED_LIB_SUFFIX
#------------------------------------------------------------------------

AC_DEFUN(SC_LOAD_TCLCONFIG, [
    if test -f "$TCLCONFIG" ; then
	. $TCLCONFIG
    fi

dnl AC_SUBST(TCL_VERSION)
dnl AC_SUBST(TCL_MAJOR_VERSION)
dnl AC_SUBST(TCL_MINOR_VERSION)
    AC_SUBST(TCL_CC)
    AC_SUBST(TCL_DEFS)
    AC_SUBST(TCL_CFLAGS)
    AC_SUBST(TCL_DBGX)

dnl not used, don't export to save symbols
dnl    AC_SUBST(TCL_LIB_FILE)

dnl don't export, not used outside of configure
     AC_SUBST(TCL_LIBS)
dnl not used, don't export to save symbols
dnl    AC_SUBST(TCL_PREFIX)

dnl not used, don't export to save symbols
dnl    AC_SUBST(TCL_EXEC_PREFIX)


dnl not used, don't export to save symbols
dnl AC_SUBST(TCL_SHLIB_CFLAGS)
    AC_SUBST(TCL_SHLIB_LD)
dnl don't export, not used outside of configure
dnl AC_SUBST(TCL_SHLIB_LD_LIBS)

# Tcl defines TCL_SHLIB_SUFFIX but TCL_SHARED_LIB_SUFFIX then looks for it
# as just SHLIB_SUFFIX.  How bizarre.
    SHLIB_SUFFIX=$TCL_SHLIB_SUFFIX
    AC_SUBST(SHLIB_SUFFIX)

dnl not used, don't export to save symbols
dnl AC_SUBST(TCL_DL_LIBS)
    AC_SUBST(TCL_LD_FLAGS)
dnl don't export, not used outside of configure
dnl AC_SUBST(TCL_LD_SEARCH_FLAGS)
dnl AC_SUBST(TCL_COMPAT_OBJS)
dnl AC_SUBST(TCL_RANLIB)

# if Tcl's build directory has been removed, TCL_LIB_SPEC should
# be used instead of TCL_BUILD_LIB_SPEC
SAVELIBS=$LIBS
eval "LIBS=\"$TCL_BUILD_LIB_SPEC $TCL_LIBS\""
AC_CHECK_FUNC(Tcl_CreateCommand,[
        AC_MSG_CHECKING([if Tcl library build specification is valid])
        AC_MSG_RESULT(yes)
],[
        TCL_BUILD_LIB_SPEC=$TCL_LIB_SPEC
        # Can't pull the following CHECKING call out since it will be
        # broken up by the CHECK_FUNC just above.
        AC_MSG_CHECKING([if Tcl library build specification is valid])
        AC_MSG_RESULT(no)
])
LIBS=$SAVELIBS

    AC_SUBST(TCL_BUILD_LIB_SPEC)
    AC_SUBST(TCL_LIB_SPEC)
dnl AC_SUBST(TCL_LIB_VERSIONS_OK)

    AC_SUBST(TCL_SHARED_LIB_SUFFIX)

dnl not used, don't export to save symbols
dnl    AC_SUBST(TCL_UNSHARED_LIB_SUFFIX)
])

#------------------------------------------------------------------------
# SC_LOAD_TKCONFIG --
#
#	Load the tkConfig.sh file
#
# Arguments:
#	
#	Requires the following vars to be set:
#		TKCONFIG
#
# Results:
#
#	Subst's the following vars:
#		TK_VERSION
#		TK_DEFS
#		TK_DBGX
#		TK_LIBS
#		TK_XINCLUDES
#		TK_XLIBSW
#		TK_BUILD_LIB_SPEC
#		TK_LIB_SPEC
#------------------------------------------------------------------------

AC_DEFUN(SC_LOAD_TKCONFIG, [
    if test -f "$TKCONFIG" ; then
      . $TKCONFIG
    fi

    AC_SUBST(TK_VERSION)
dnl not actually used, don't export to save symbols
dnl    AC_SUBST(TK_MAJOR_VERSION)
dnl    AC_SUBST(TK_MINOR_VERSION)
    AC_SUBST(TK_DEFS)
    AC_SUBST(TK_DBGX)

dnl not used, don't export to save symbols
    dnl AC_SUBST(TK_LIB_FILE)

dnl not used outside of configure
    AC_SUBST(TK_LIBS)
dnl not used, don't export to save symbols
dnl    AC_SUBST(TK_PREFIX)

dnl not used, don't export to save symbols
dnl    AC_SUBST(TK_EXEC_PREFIX)

    AC_SUBST(TK_XINCLUDES)
    AC_SUBST(TK_XLIBSW)
    AC_SUBST(TK_BUILD_LIB_SPEC)
    AC_SUBST(TK_LIB_SPEC)
])

#------------------------------------------------------------------------
# SC_ENABLE_GCC --
#
#	Allows the use of GCC if available
#
# Arguments:
#	none
#	
# Results:
#
#	Adds the following arguments to configure:
#		--enable-gcc
#
#	Subst's the following vars:
#		CC	Command to use for the compiler
#------------------------------------------------------------------------

AC_DEFUN(SC_ENABLE_GCC, [
    AC_ARG_ENABLE(gcc, [  --enable-gcc            allow use of gcc if available [--disable-gcc]],
	[ok=$enableval], [ok=no])
    if test "$ok" = "yes"; then
	AC_PROG_CC
    else
	CC=${CC-cc}
	AC_SUBST(CC)
    fi
])

#------------------------------------------------------------------------
# SC_ENABLE_SHARED --
#
#	Allows the building of shared libraries
#
# Arguments:
#	none
#	
# Results:
#
#	Adds the following arguments to configure:
#		--enable-shared=yes|no
#
#	Subst's the following vars:
#		BUILD_SHARED	Value of YES or NO
#------------------------------------------------------------------------

AC_DEFUN(SC_ENABLE_SHARED, [
    AC_ARG_ENABLE(shared,
	[  --enable-shared         build and link with shared libraries [--enable-shared]],
	[BUILD_SHARED=$enableval],
	[BUILD_SHARED=NO])
    case "$BUILD_SHARED" in
	YES|yes)
	    AC_MSG_RESULT(Will build shared libraries)
	    BUILD_SHARED=YES
	    ;;
	NO|no)
	    AC_MSG_RESULT(Will not build shared libraries)
	    BUILD_SHARED=NO
	    ;;
	*)
	    AC_MSG_ERROR(Invalid argument to --enable-shared=, expected YES or NO)
	    exit 1
	    ;;
    esac
    AC_SUBST(BUILD_SHARED)
])

#------------------------------------------------------------------------
# SC_ENABLE_THREADS --
#
#	Specify if thread support should be enabled
#
# Arguments:
#	none
#	
# Results:
#
#	Adds the following arguments to configure:
#		--enable-threads=yes|no
#
#	Defines the following vars:
#		THREADS_LIBS	Thread library(s)
#		TCL_THREADS
#		_REENTRANT
#		CFLAGS_WARNING	C flags warnings for gcc
#
#------------------------------------------------------------------------

AC_DEFUN(SC_ENABLE_THREADS, [
    AC_ARG_ENABLE(threads,[  --enable-threads        enable Threads support [--disable-threads]],,enableval="no")

    if test "$enableval" = "yes"; then
	AC_MSG_RESULT(Will compile with Threads support)
	AC_DEFINE(TCL_THREADS)
	AC_DEFINE(_REENTRANT)

	AC_CHECK_LIB(pthread,pthread_mutex_init,tcl_ok=yes,tcl_ok=no)
	if test "$tcl_ok" = "yes"; then
	    # The space is needed
	    THREADS_LIBS=" -lpthread"
	else
	    AC_MSG_WARN("Don t know how to find pthread lib on your system - you must disable thread support or edit the LIBS in the Makefile...")
	fi
    else
	AC_MSG_RESULT(Will compile without Threads support (normal))
    fi

    # set the warning flags depending on whether or not we are using gcc
    if test "${GCC}" = "yes" ; then
	# leave -Wimplicit-int out, the X libs generate so many of these warnings
	# that they obscure everything else.

	CFLAGS_WARNING="-Wall -Wconversion -Wno-implicit-int"
    else
	CFLAGS_WARNING=""
    fi
])

#------------------------------------------------------------------------
# SC_ENABLE_SYMBOLS --
#
#	Specify if debugging symbols should be used
#
# Arguments:
#	none
#	
#	Requires the following vars to be set:
#		CFLAGS_DEBUG
#		CFLAGS_OPTIMIZE
#	
# Results:
#
#	Adds the following arguments to configure:
#		--enable-symbols
#
#	Defines the following vars:
#		CFLAGS_DEFAULT	Sets to CFLAGS_DEBUG if true
#				Sets to CFLAGS_OPTIMIZE if false
#		DBGX		Debug library extension
#
#------------------------------------------------------------------------

AC_DEFUN(SC_ENABLE_SYMBOLS, [
    AC_ARG_ENABLE(symbols, [  --enable-symbols        build with debugging symbols [--disable-symbols]],    [tcl_ok=$enableval], [tcl_ok=no])
    if test "$tcl_ok" = "yes"; then
	CFLAGS_DEFAULT='$(CFLAGS_DEBUG)'
	DBGX=g
    else
	CFLAGS_DEFAULT='$(CFLAGS_OPTIMIZE)'
	DBGX=""
    fi
])


#--------------------------------------------------------------------
# SC_TCL_CONFIG_CFLAGS
#
#	Try to determine the proper flags to pass to the compiler
#	for building shared libraries and other such nonsense.
#
# Arguments:
#	none
#
# Results:
#
#	Defines the following vars:
#
#       DL_OBJS -       Name of the object file that implements dynamic
#                       loading for Tcl on this system.
#       DL_LIBS -       Library file(s) to include in tclsh and other base
#                       applications in order for the "load" command to work.
#       LD_FLAGS -      Flags to pass to the compiler when linking object
#                       files into an executable application binary such
#                       as tclsh.
#       LD_SEARCH_FLAGS-Flags to pass to ld, such as "-R /usr/local/tcl/lib",
#                       that tell the run-time dynamic linker where to look
#                       for shared libraries such as libtcl.so.  Depends on
#                       the variable LIB_RUNTIME_DIR in the Makefile.
#       MAKE_LIB -      Command to execute to build the Tcl library;
#                       differs depending on whether or not Tcl is being
#                       compiled as a shared library.
#       SHLIB_CFLAGS -  Flags to pass to cc when compiling the components
#                       of a shared library (may request position-independent
#                       code, among other things).
#       SHLIB_LD -      Base command to use for combining object files
#                       into a shared library.
#       SHLIB_LD_LIBS - Dependent libraries for the linker to scan when
#                       creating shared libraries.  This symbol typically
#                       goes at the end of the "ld" commands that build
#                       shared libraries. The value of the symbol is
#                       "${LIBS}" if all of the dependent libraries should
#                       be specified when creating a shared library.  If
#                       dependent libraries should not be specified (as on
#                       SunOS 4.x, where they cause the link to fail, or in
#                       general if Tcl and Tk aren't themselves shared
#                       libraries), then this symbol has an empty string
#                       as its value.
#       SHLIB_SUFFIX -  Suffix to use for the names of dynamically loadable
#                       extensions.  An empty string means we don't know how
#                       to use shared libraries on this platform.
#       TCL_LIB_FILE -  Name of the file that contains the Tcl library, such
#                       as libtcl7.8.so or libtcl7.8.a.
#       TCL_LIB_SUFFIX -Specifies everything that comes after the "libtcl"
#                       in the shared library name, using the $VERSION variable
#                       to put the version in the right place.  This is used
#                       by platforms that need non-standard library names.
#                       Examples:  ${VERSION}.so.1.1 on NetBSD, since it needs
#                       to have a version after the .so, and ${VERSION}.a
#                       on AIX, since the Tcl shared library needs to have
#                       a .a extension whereas shared objects for loadable
#                       extensions have a .so extension.  Defaults to
#                       ${VERSION}${SHLIB_SUFFIX}.
#       TCL_NEEDS_EXP_FILE -
#                       1 means that an export file is needed to link to a
#                       shared library.
#       TCL_EXP_FILE -  The name of the installed export / import file which
#                       should be used to link to the Tcl shared library.
#                       Empty if Tcl is unshared.
#       TCL_BUILD_EXP_FILE -
#                       The name of the built export / import file which
#                       should be used to link to the Tcl shared library.
#                       Empty if Tcl is unshared.
#	CFLAGS_DEBUG -
#			Flags used when running the compiler in debug mode
#	CFLAGS_OPTIMIZE -
#			Flags used when running the compiler in optimize mode
#--------------------------------------------------------------------

AC_DEFUN(SC_TCL_CONFIG_CFLAGS, [

    # Step 1: set the variable "system" to hold the name and version number
    # for the system.  This can usually be done via the "uname" command, but
    # there are a few systems, like Next, where this doesn't work.

    AC_MSG_CHECKING([system version (for dynamic loading)])
    if test -f /usr/lib/NextStep/software_version; then
	system=NEXTSTEP-`awk '/3/,/3/' /usr/lib/NextStep/software_version`
    else
	system=`uname -s`-`uname -r`
	if test "$?" -ne 0 ; then
	    AC_MSG_RESULT([unknown (can't find uname command)])
	    system=unknown
	else
	    # Special check for weird MP-RAS system (uname returns weird
	    # results, and the version is kept in special file).
	
	    if test -r /etc/.relid -a "X`uname -n`" = "X`uname -s`" ; then
		system=MP-RAS-`awk '{print $3}' /etc/.relid'`
	    fi
	    if test "`uname -s`" = "AIX" ; then
		system=AIX-`uname -v`.`uname -r`
	    fi
	    AC_MSG_RESULT($system)
	fi
    fi

    # Step 2: check for existence of -ldl library.  This is needed because
    # Linux can use either -ldl or -ldld for dynamic loading.

    AC_CHECK_LIB(dl, dlopen, have_dl=yes, have_dl=no)

    # Step 3: set configuration options based on system name and version.

    do64bit_ok=no
    fullSrcDir=`cd $srcdir; pwd`
    EXTRA_CFLAGS=""
    TCL_EXPORT_FILE_SUFFIX=""
    TCL_UNSHARED_LIB_SUFFIX=""
    TCL_TRIM_DOTS='`echo ${VERSION} | tr -d .`'
    ECHO_VERSION='`echo ${VERSION}`'
    TCL_LIB_VERSIONS_OK=ok
    CFLAGS_DEBUG=-g
    CFLAGS_OPTIMIZE=-O
    TCL_NEEDS_EXP_FILE=0
    TCL_BUILD_EXP_FILE=""
    TCL_EXP_FILE=""
    case $system in
	AIX-4.[[2-9]])
	    SHLIB_CFLAGS=""
	    SHLIB_LD="$fullSrcDir/ldAix /bin/ld -bhalt:4 -bM:SRE -bE:lib.exp -H512 -T512 -bnoentry"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
	    TCL_NEEDS_EXP_FILE=1
	    TCL_EXPORT_FILE_SUFFIX='${VERSION}\$\{DBGX\}.exp'
	    ;;
	AIX-*)
	    SHLIB_CFLAGS=""
	    SHLIB_LD="$fullSrcDir/ldAix /bin/ld -bhalt:4 -bM:SRE -bE:lib.exp -H512 -T512"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    LIBOBJS="$LIBOBJS tclLoadAix.o"
	    DL_LIBS="-lld"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
	    TCL_NEEDS_EXP_FILE=1
	    TCL_EXPORT_FILE_SUFFIX='${VERSION}\$\{DBGX\}.exp'
	    ;;
	BSD/OS-2.1*|BSD/OS-3*)
	    SHLIB_CFLAGS=""
	    SHLIB_LD="shlicc -r"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	BSD/OS-4.*)
	    SHLIB_CFLAGS="-export-dynamic -fPIC"
	    SHLIB_LD="cc -shared"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS="-export-dynamic"
	    LD_SEARCH_FLAGS=""
	    ;;
	dgux*)
	    SHLIB_CFLAGS="-K PIC"
	    SHLIB_LD="cc -G"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	HP-UX-*.08.*|HP-UX-*.09.*|HP-UX-*.10.*|HP-UX-*.11.*)
	    SHLIB_SUFFIX=".sl"
	    AC_CHECK_LIB(dld, shl_load, tcl_ok=yes, tcl_ok=no)
	    if test "$tcl_ok" = yes; then
		SHLIB_CFLAGS="+z"
		SHLIB_LD="ld -b"
		SHLIB_LD_LIBS=""
		DL_OBJS="tclLoadShl.o"
		DL_LIBS="-ldld"
		LD_FLAGS="-Wl,-E"
		LD_SEARCH_FLAGS='-Wl,+s,+b,${LIB_RUNTIME_DIR}:.'
	    fi
	    ;;
	IRIX-4.*)
	    SHLIB_CFLAGS="-G 0"
	    SHLIB_SUFFIX=".a"
	    SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r -G 0"
	    SHLIB_LD_LIBS='${LIBS}'
	    DL_OBJS="tclLoadAout.o"
	    DL_LIBS=""
	    LD_FLAGS="-Wl,-D,08000000"
	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
	    TCL_SHARED_LIB_SUFFIX='${VERSION}\$\{DBGX\}.a'
	    ;;
	IRIX-5.*|IRIX-6.*|IRIX64-6.5*)
	    SHLIB_CFLAGS=""
	    SHLIB_LD="ld -n32 -shared -rdata_shared"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS=""
	    LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
	    if test "$CC" = "gcc" -o `$CC -v 2>&1 | grep -c gcc` != "0" ; then
		EXTRA_CFLAGS="-mabi=n32"
		LD_FLAGS="-mabi=n32"
	    else
		case $system in
		    IRIX-6.3)
			# Use to build 6.2 compatible binaries on 6.3.
			EXTRA_CFLAGS="-n32 -D_OLD_TERMIOS"
			;;
		    *)
			EXTRA_CFLAGS="-n32"
			;;
		esac
		LD_FLAGS="-n32"
	    fi
	    ;;
	IRIX64-6.*)
	    SHLIB_CFLAGS=""
	    SHLIB_LD="ld -32 -shared -rdata_shared"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS=""
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
	    ;;
	Linux*)
	    SHLIB_CFLAGS="-fPIC"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    if test "$have_dl" = yes; then
		SHLIB_LD="${CC} -shared"
		DL_OBJS="tclLoadDl.o"
		DL_LIBS="-ldl"
		LD_FLAGS="-rdynamic"
		LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
	    else
		AC_CHECK_HEADER(dld.h, [
		    SHLIB_LD="ld -shared"
		    DL_OBJS="tclLoadDld.o"
		    DL_LIBS="-ldld"
		    LD_FLAGS=""
		    LD_SEARCH_FLAGS=""])
	    fi
	    ;;
	MP-RAS-02*)
	    SHLIB_CFLAGS="-K PIC"
	    SHLIB_LD="cc -G"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	MP-RAS-*)
	    SHLIB_CFLAGS="-K PIC"
	    SHLIB_LD="cc -G"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS="-Wl,-Bexport"
	    LD_SEARCH_FLAGS=""
	    ;;
	NetBSD-*|FreeBSD-[[12]].*|OpenBSD-*)
	    # Not available on all versions:  check for include file.
	    AC_CHECK_HEADER(dlfcn.h, [
		SHLIB_CFLAGS="-fpic"
		SHLIB_LD="ld -Bshareable -x"
		SHLIB_LD_LIBS=""
		SHLIB_SUFFIX=".so"
		DL_OBJS="tclLoadDl.o"
		DL_LIBS=""
		LD_FLAGS=""
		LD_SEARCH_FLAGS=""
		TCL_SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.so.1.0'
	    ], [
		SHLIB_CFLAGS=""
		SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r"
		SHLIB_LD_LIBS='${LIBS}'
		SHLIB_SUFFIX=".a"
		DL_OBJS="tclLoadAout.o"
		DL_LIBS=""
		LD_FLAGS=""
		LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
		TCL_SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
	    ])

	    # FreeBSD doesn't handle version numbers with dots.

	    TCL_UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
	    TCL_LIB_VERSIONS_OK=nodots
	    ;;
	FreeBSD-*)
	    # FreeBSD 3.* and greater have ELF.
	    SHLIB_CFLAGS="-fpic"
	    SHLIB_LD="ld -Bshareable -x"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS=""
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	NEXTSTEP-*)
	    SHLIB_CFLAGS=""
	    SHLIB_LD="cc -nostdlib -r"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadNext.o"
	    DL_LIBS=""
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OS/390-*)
	    CFLAGS_OPTIMIZE=""      # Optimizer is buggy
	    AC_DEFINE(_OE_SOCKETS)  # needed in sys/socket.h
	    ;;      
	OSF1-1.0|OSF1-1.1|OSF1-1.2)
	    # OSF/1 1.[012] from OSF, and derivatives, including Paragon OSF/1
	    SHLIB_CFLAGS=""
	    # Hack: make package name same as library name
	    SHLIB_LD='ld -R -export $@:'
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadOSF.o"
	    DL_LIBS=""
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OSF1-1.*)
	    # OSF/1 1.3 from OSF using ELF, and derivatives, including AD2
	    SHLIB_CFLAGS="-fpic"
	    SHLIB_LD="ld -shared"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS=""
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OSF1-V*)
	    # Digital OSF/1
	    SHLIB_CFLAGS=""
	    SHLIB_LD='ld -shared -expect_unresolved "*"'
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS=""
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
	    ;;
	RISCos-*)
	    SHLIB_CFLAGS="-G 0"
	    SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r -G 0"
	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".a"
	    DL_OBJS="tclLoadAout.o"
	    DL_LIBS=""
	    LD_FLAGS="-Wl,-D,08000000"
	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
	    ;;
	SCO_SV-3.2*)
	    # Note, dlopen is available only on SCO 3.2.5 and greater.  However,
	    # this test works, since "uname -s" was non-standard in 3.2.4 and
	    # below.
	    SHLIB_CFLAGS="-Kpic -belf"
	    SHLIB_LD="ld -G"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS=""
	    LD_FLAGS="-belf -Wl,-Bexport"
	    LD_SEARCH_FLAGS=""
	    ;;
	SINIX*5.4*)
	    SHLIB_CFLAGS="-K PIC"
	    SHLIB_LD="cc -G"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	SunOS-4*)
	    SHLIB_CFLAGS="-PIC"
	    SHLIB_LD="ld"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'

	    # SunOS can't handle version numbers with dots in them in library
	    # specs, like -ltcl7.5, so use -ltcl75 instead.  Also, it
	    # requires an extra version number at the end of .so file names.
	    # So, the library has to have a name like libtcl75.so.1.0

	    TCL_SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.so.1.0'
	    TCL_UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
	    TCL_LIB_VERSIONS_OK=nodots
	    ;;
	SunOS-5.[[0-6]]*)
	    SHLIB_CFLAGS="-KPIC"
	    SHLIB_LD="/usr/ccs/bin/ld -G -z text"

	    # Note: need the LIBS below, otherwise Tk won't find Tcl's
	    # symbols when dynamically loaded into tclsh.

	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    LD_FLAGS=""
	    LD_SEARCH_FLAGS='-Wl,-R,${LIB_RUNTIME_DIR}'
	    ;;
	SunOS-5*)
	    SHLIB_CFLAGS="-KPIC"
	    SHLIB_LD="/usr/ccs/bin/ld -G -z text"
	    LD_FLAGS=""
    
	    do64bit_ok=no
	    if test "$do64bit" = "yes" ; then
	    arch=`isainfo`
	    if test "$arch" = "sparcv9 sparc" ; then
		if test "$CC" != "gcc" -a `$CC -v 2>&1 | grep -c gcc` = "0" ; then
		do64bit_ok=yes
		EXTRA_CFLAGS="-xarch=v9"
		LD_FLAGS="-xarch=v9"
		else 
		AC_MSG_WARN("64bit mode not supported using GCC on $system")
		fi
	    else
		AC_MSG_WARN("64bit mode only supported sparcv9 system")
	    fi
	    fi
	    
	    # Note: need the LIBS below, otherwise Tk won't find Tcl's
	    # symbols when dynamically loaded into tclsh.

	    SHLIB_LD_LIBS='${LIBS}'
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    if test "$CC" = "gcc" -o `$CC -v 2>&1 | grep -c gcc` != "0" ; then
		LD_SEARCH_FLAGS='-Wl,-R,${LIB_RUNTIME_DIR}'
	    else
		LD_SEARCH_FLAGS='-R ${LIB_RUNTIME_DIR}'
	    fi
	    ;;
	ULTRIX-4.*)
	    SHLIB_CFLAGS="-G 0"
	    SHLIB_SUFFIX=".a"
	    SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r -G 0"
	    SHLIB_LD_LIBS='${LIBS}'
	    DL_OBJS="tclLoadAout.o"
	    DL_LIBS=""
	    LD_FLAGS="-Wl,-D,08000000"
	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
	    ;;
	UNIX_SV* | UnixWare-5*)
	    SHLIB_CFLAGS="-KPIC"
	    SHLIB_LD="cc -G"
	    SHLIB_LD_LIBS=""
	    SHLIB_SUFFIX=".so"
	    DL_OBJS="tclLoadDl.o"
	    DL_LIBS="-ldl"
	    # Some UNIX_SV* systems (unixware 1.1.2 for example) have linkers
	    # that don't grok the -Bexport option.  Test that it does.
	    hold_ldflags=$LDFLAGS
	    AC_MSG_CHECKING(for ld accepts -Bexport flag)
	    LDFLAGS="${LDFLAGS} -Wl,-Bexport"
	    AC_TRY_LINK(, [int i;], found=yes, found=no)
	    LDFLAGS=$hold_ldflags
	    AC_MSG_RESULT($found)
	    if test $found = yes; then
	    LD_FLAGS="-Wl,-Bexport"
	    else
	    LD_FLAGS=""
	    fi
	    LD_SEARCH_FLAGS=""
	    ;;
    esac

    if test "$do64bit" = "yes" -a "$do64bit_ok" = "no" ; then
    AC_MSG_WARN("64bit support being disabled -- not supported on this platform")
    fi

    # Step 4: If pseudo-static linking is in use (see K. B. Kenny, "Dynamic
    # Loading for Tcl -- What Became of It?".  Proc. 2nd Tcl/Tk Workshop,
    # New Orleans, LA, Computerized Processes Unlimited, 1994), then we need
    # to determine which of several header files defines the a.out file
    # format (a.out.h, sys/exec.h, or sys/exec_aout.h).  At present, we
    # support only a file format that is more or less version-7-compatible. 
    # In particular,
    #	- a.out files must begin with `struct exec'.
    #	- the N_TXTOFF on the `struct exec' must compute the seek address
    #	  of the text segment
    #	- The `struct exec' must contain a_magic, a_text, a_data, a_bss
    #	  and a_entry fields.
    # The following compilation should succeed if and only if either sys/exec.h
    # or a.out.h is usable for the purpose.
    #
    # Note that the modified COFF format used on MIPS Ultrix 4.x is usable; the
    # `struct exec' includes a second header that contains information that
    # duplicates the v7 fields that are needed.

    if test "x$DL_OBJS" = "xtclLoadAout.o" ; then
	AC_MSG_CHECKING(sys/exec.h)
	AC_TRY_COMPILE([#include <sys/exec.h>],[
	    struct exec foo;
	    unsigned long seek;
	    int flag;
#if defined(__mips) || defined(mips)
	    seek = N_TXTOFF (foo.ex_f, foo.ex_o);
#else
	    seek = N_TXTOFF (foo);
#endif
	    flag = (foo.a_magic == OMAGIC);
	    return foo.a_text + foo.a_data + foo.a_bss + foo.a_entry;
    ], tcl_ok=usable, tcl_ok=unusable)
	AC_MSG_RESULT($tcl_ok)
	if test $tcl_ok = usable; then
	    AC_DEFINE(USE_SYS_EXEC_H)
	else
	    AC_MSG_CHECKING(a.out.h)
	    AC_TRY_COMPILE([#include <a.out.h>],[
		struct exec foo;
		unsigned long seek;
		int flag;
#if defined(__mips) || defined(mips)
		seek = N_TXTOFF (foo.ex_f, foo.ex_o);
#else
		seek = N_TXTOFF (foo);
#endif
		flag = (foo.a_magic == OMAGIC);
		return foo.a_text + foo.a_data + foo.a_bss + foo.a_entry;
	    ], tcl_ok=usable, tcl_ok=unusable)
	    AC_MSG_RESULT($tcl_ok)
	    if test $tcl_ok = usable; then
		AC_DEFINE(USE_A_OUT_H)
	    else
		AC_MSG_CHECKING(sys/exec_aout.h)
		AC_TRY_COMPILE([#include <sys/exec_aout.h>],[
		    struct exec foo;
		    unsigned long seek;
		    int flag;
#if defined(__mips) || defined(mips)
		    seek = N_TXTOFF (foo.ex_f, foo.ex_o);
#else
		    seek = N_TXTOFF (foo);
#endif
		    flag = (foo.a_midmag == OMAGIC);
		    return foo.a_text + foo.a_data + foo.a_bss + foo.a_entry;
		], tcl_ok=usable, tcl_ok=unusable)
		AC_MSG_RESULT($tcl_ok)
		if test $tcl_ok = usable; then
		    AC_DEFINE(USE_SYS_EXEC_AOUT_H)
		else
		    DL_OBJS=""
		fi
	    fi
	fi
    fi

    # Step 5: disable dynamic loading if requested via a command-line switch.

    AC_ARG_ENABLE(load, [  --disable-load          disallow dynamic loading and "load" command],
	[tcl_ok=$enableval], [tcl_ok=yes])
    if test "$tcl_ok" = "no"; then
	DL_OBJS=""
    fi

    if test "x$DL_OBJS" != "x" ; then
	BUILD_DLTEST="\$(DLTEST_TARGETS)"
    else
	echo "Can't figure out how to do dynamic loading or shared libraries"
	echo "on this system."
	SHLIB_CFLAGS=""
	SHLIB_LD=""
	SHLIB_SUFFIX=""
	DL_OBJS="tclLoadNone.o"
	DL_LIBS=""
	LD_FLAGS=""
	LD_SEARCH_FLAGS=""
	BUILD_DLTEST=""
    fi

    # If we're running gcc, then change the C flags for compiling shared
    # libraries to the right flags for gcc, instead of those for the
    # standard manufacturer compiler.

    if test "$DL_OBJS" != "tclLoadNone.o" ; then
	if test "$CC" = "gcc" -o `$CC -v 2>&1 | grep -c gcc` != "0" ; then
	    case $system in
		AIX-*)
		    ;;
		BSD/OS*)
		    ;;
		IRIX*)
		    ;;
		NetBSD-*|FreeBSD-*|OpenBSD-*)
		    ;;
		RISCos-*)
		    ;;
		ULTRIX-4.*)
		    ;;
		*)
		    SHLIB_CFLAGS="-fPIC"
		    ;;
	    esac
	fi
    fi
])