[thirdparty/gcc.git] / libobjc / configure.ac

# Process this file with autoconf to produce a configure script.
#   Copyright (C) 1994-2025 Free Software Foundation, Inc.
#   Originally contributed by Dave Love (d.love@dl.ac.uk).
#
#This file is part of GCC.
#
#GCC is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 3, or (at your option)
#any later version.
#
#GCC is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with GCC; see the file COPYING3.  If not see
#<http://www.gnu.org/licenses/>.

AC_INIT(package-unused, version-unused,, libobjc)
AC_CONFIG_SRCDIR([objc/objc.h])
AC_CONFIG_MACRO_DIRS([../config] [..])
GCC_TOPLEV_SUBDIRS

# We need the following definitions because AC_PROG_LIBTOOL relies on them
PACKAGE=libobjc
# Version is pulled out to make it a bit easier to change using sed.
VERSION=4:0:0
AC_SUBST(VERSION)

# This works around the fact that libtool configuration may change LD
# for this particular configuration, but some shells, instead of
# keeping the changes in LD private, export them just because LD is
# exported.
ORIGINAL_LD_FOR_MULTILIBS=$LD

# -------
# Options
# -------

# We use these options to decide which functions to include.
AC_ARG_WITH(target-subdir,
[  --with-target-subdir=SUBDIR
                           configuring in a subdirectory])
AC_ARG_WITH(cross-host,
[  --with-cross-host=HOST  configuring with a cross compiler])

AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
AC_ARG_ENABLE(version-specific-runtime-libs,
[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
[case "$enableval" in
 yes) version_specific_libs=yes ;;
 no)  version_specific_libs=no ;;
 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
 esac],
[version_specific_libs=no])
AC_MSG_RESULT($version_specific_libs)

# -----------
# Directories
# -----------

# Find the rest of the source tree framework.
AM_ENABLE_MULTILIB(, ..)

AC_CANONICAL_SYSTEM
ACX_NONCANONICAL_TARGET

# Export source directory.
# These need to be absolute paths, yet at the same time need to
# canonicalize only relative paths, because then amd will not unmount
# drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
case $srcdir in
  [\\/$]* | ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
  *) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
esac
AC_SUBST(glibcpp_srcdir)

GCC_WITH_TOOLEXECLIBDIR

# Calculate toolexeclibdir
# Also toolexecdir, though it's only used in toolexeclibdir
case ${version_specific_libs} in
  yes)
    # Need the gcc compiler version to know where to install libraries
    # and header files if --enable-version-specific-runtime-libs option
    # is selected.
    toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
    ;;
  no)
    if test -n "$with_cross_host" &&
       test x"$with_cross_host" != x"no"; then
      # Install a library built with a cross compiler in tooldir, not libdir.
      toolexecdir='$(exec_prefix)/$(target_noncanonical)'
      case ${with_toolexeclibdir} in
	no)
	  toolexeclibdir='$(toolexecdir)/lib'
	  ;;
	*)
	  toolexeclibdir=${with_toolexeclibdir}
	  ;;
      esac
    else
      toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
      toolexeclibdir='$(libdir)'
    fi
    multi_os_directory=`$CC -print-multi-os-directory`
    case $multi_os_directory in
      .) ;; # Avoid trailing /.
      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
    esac
    ;;
esac
AC_SUBST(toolexecdir)
AC_SUBST(toolexeclibdir)

# Figure out if we want to name the include directory and the
#  library name changes differently.
includedirname=include
libsuffix=
case "${host}" in
  *-darwin*)
    # Darwin is the only target so far that needs a different include directory.
    includedirname=include-gnu-runtime
    libsuffix=-gnu
    ;;
esac
AC_SUBST(includedirname)
AC_SUBST(libsuffix)

AC_CONFIG_HEADERS(config.h)

# --------
# Programs
# --------

GCC_NO_EXECUTABLES

# We must force CC to /not/ be a precious variable; otherwise
# the wrong, non-multilib-adjusted value will be used in multilibs.
# As a side effect, we have to subst CFLAGS ourselves.
m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
m4_define([_AC_ARG_VAR_PRECIOUS],[])
AC_PROG_CC
m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

# extra LD Flags which are required for targets
ACX_LT_HOST_FLAGS

# Add CET specific flags if CET is enabled
GCC_CET_FLAGS(CET_FLAGS)
XCFLAGS="$XCFLAGS $CET_FLAGS"

AC_SUBST(CFLAGS)
AC_SUBST(XCFLAGS)

AC_CHECK_TOOL(AS, as)
AC_CHECK_TOOL(AR, ar)
AC_CHECK_TOOL(RANLIB, ranlib, :)
AC_PROG_INSTALL

AM_MAINTAINER_MODE

# Enable Win32 DLL on MS Windows - FIXME
AC_LIBTOOL_WIN32_DLL

AC_PROG_LIBTOOL

AM_PROG_CC_C_O

AC_PROG_MAKE_SET

AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])

# Must come after libtool is initialized.
case "${host}" in
  *-darwin[[4567]]*)
    # Earlier Darwin versions need -single_module when linking libobjc; they
    # do not support @rpath.
    extra_ldflags_libobjc='$(lt_host_flags) -Wl,-single_module'
    ;;
  *-darwin*)
    # Otherwise, single_module is the default and multi-module is ignored and
    # obsolete.
    extra_ldflags_libobjc='$(lt_host_flags)'
    if test "x$enable_darwin_at_rpath" = "xyes"; then
      extra_ldflags_libobjc="${extra_ldflags_libobjc} -Wc,-nodefaultrpaths"
      extra_ldflags_libobjc="${extra_ldflags_libobjc} -Wl,-rpath,@loader_path"
    fi
    ;;
  *-cygwin*|*-mingw*)
    # Tell libtool to build DLLs on Windows
    extra_ldflags_libobjc='$(lt_host_flags)'
    ;;
esac
AC_SUBST(extra_ldflags_libobjc)

# -------
# Headers
# -------

# Sanity check for the cross-compilation case:
AC_CHECK_HEADER(stdio.h,:,
  [AC_MSG_ERROR([Can't find stdio.h.
You must have a usable C system for the target already installed, at least
including headers and, preferably, the library, before you can configure
the Objective C runtime system.  If necessary, install gcc now with 
\`LANGUAGES=c', then the target library, then build with \`LANGUAGES=objc'.])])

AC_HEADER_STDC

AC_CHECK_HEADERS(sched.h)

# -----------
# Miscellanea
# -----------

# Check if we have thread-local storage
GCC_CHECK_TLS

gt_BITFIELD_TYPE_MATTERS

# -----------
# boehm-gc
# -----------

AC_ARG_ENABLE(objc-gc,
[AS_HELP_STRING([--enable-objc-gc],
		[enable use of Boehm's garbage collector with the
		 GNU Objective-C runtime])],,enable_objc_gc=no)
AC_ARG_WITH([target-bdw-gc],
[AS_HELP_STRING([--with-target-bdw-gc=PATHLIST],
		[specify prefix directory for installed bdw-gc package.
		 Equivalent to --with-target-bdw-gc-include=PATH/include
		 plus --with-target-bdw-gc-lib=PATH/lib])])
AC_ARG_WITH([target-bdw-gc-include],
[AS_HELP_STRING([--with-target-bdw-gc-include=PATHLIST],
		[specify directories for installed bdw-gc include files])])
AC_ARG_WITH([target-bdw-gc-lib],
[AS_HELP_STRING([--with-target-bdw-gc-lib=PATHLIST],
		[specify directories for installed bdw-gc library])])
		  
case "$enable_objc_gc" in
no)
  use_bdw_gc=no
  ;;
*)
  AC_MSG_CHECKING([for bdw garbage collector])
  if test "x$with_target_bdw_gc$with_target_bdw_gc_include$with_target_bdw_gc_lib" = x; then
    dnl no bdw-gw options, assuming bdw-gc in default locations
    BDW_GC_CFLAGS=
    BDW_GC_LIBS="-lgc"
  else
    dnl bdw-gw options passed by configure flags
    if test "x$with_target_bdw_gc_include" = x && test "x$with_target_bdw_gc_lib" != x; then
      AC_MSG_ERROR([found --with-target-bdw-gc-lib but --with-target-bdw-gc-include missing])
    elif test "x$with_target_bdw_gc_include" != x && test "x$with_target_bdw_gc_lib" = x; then
      AC_MSG_ERROR([found --with-target-bdw-gc-include but --with-target-bdw-gc-lib missing])
    else
      AC_MSG_RESULT([using paths configured with --with-target-bdw-gc options])
    fi
    mldir=`${CC-gcc} --print-multi-directory 2>/dev/null`
    bdw_val=
    if test "x$with_target_bdw_gc" != x; then
      for i in `echo $with_target_bdw_gc | tr ',' ' '`; do
        case "$i" in
          *=*) sd=${i%%=*}; d=${i#*=} ;;
          *) sd=.; d=$i ;;
        esac
        if test "$mldir" = "$sd"; then
          bdw_val=$d
        fi
      done
      if test "x$bdw_val" = x; then
        AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc])
      fi
      bdw_inc_dir="$bdw_val/include"
      bdw_lib_dir="$bdw_val/lib"
    fi
    bdw_val=
    if test "x$with_target_bdw_gc_include" != x; then
      for i in `echo $with_target_bdw_gc_include | tr ',' ' '`; do
        case "$i" in
          *=*) sd=${i%%=*}; d=${i#*=} ;;
          *) sd=.; d=$i; fallback=$i ;;
        esac
        if test "$mldir" = "$sd"; then
          bdw_val=$d
        fi
      done
      if test "x$bdw_val" = x && test "x$bdw_inc_dir" = x && test "x$fallback" != x; then
        bdw_inc_dir="$fallback"
      elif test "x$bdw_val" = x; then
        AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-include])
      else
        bdw_inc_dir="$bdw_val"
      fi
    fi
    bdw_val=
    if test "x$with_target_bdw_gc_lib" != x; then
      for i in `echo $with_target_bdw_gc_lib | tr ',' ' '`; do
        case "$i" in
          *=*) sd=${i%%=*}; d=${i#*=} ;;
          *) sd=.; d=$i ;;
        esac
        if test "$mldir" = "$sd"; then
          bdw_val=$d
        fi
      done
      if test "x$bdw_val" = x; then
        AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-lib])
      fi
      bdw_lib_dir="$bdw_val"
    fi
    if test "x$bdw_inc_dir" = x; then
      AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-include])
    fi
    if test "x$bdw_lib_dir" = x; then
      AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-lib])
    fi
    BDW_GC_CFLAGS="-I$bdw_inc_dir"
    if test -f $bdw_lib_dir/libgc.la; then
      BDW_GC_LIBS="$bdw_lib_dir/libgc.la"
    else
      BDW_GC_LIBS="-L$bdw_lib_dir -lgc"
    fi
    AC_MSG_RESULT([found])
  fi

  case "$BDW_GC_LIBS" in
  *libgc.la)
    use_bdw_gc=yes
    ;;
  *)
    AC_MSG_CHECKING([for system boehm-gc])
    save_CFLAGS=$CFLAGS
    save_LIBS=$LIBS
    CFLAGS="$CFLAGS $BDW_GC_CFLAGS"
    LIBS="$LIBS $BDW_GC_LIBS"
    dnl the link test is not good enough for ARM32 multilib detection,
    dnl first check to link, then to run
    AC_LINK_IFELSE(
      [AC_LANG_PROGRAM([#include <gc/gc.h>],[GC_init()])],
      [
        AC_RUN_IFELSE([AC_LANG_SOURCE([[
          #include <gc/gc.h>
          int main() {
            GC_init();
            return 0;
          }
          ]])],
          [system_bdw_gc_found=yes],
          [system_bdw_gc_found=no],
          dnl assume no system boehm-gc for cross builds ...
          [system_bdw_gc_found=no]
        )
      ],
      [system_bdw_gc_found=no])
    CFLAGS=$save_CFLAGS
    LIBS=$save_LIBS
    if test x$enable_objc_gc = xauto && test x$system_bdw_gc_found = xno; then
      AC_MSG_WARN([system bdw-gc not found, not building libobjc_gc])
      use_bdw_gc=no
    elif test x$enable_objc_gc = xyes && test x$system_bdw_gc_found = xno; then
      AC_MSG_ERROR([system bdw-gc required but not found])
    else
      use_bdw_gc=yes
      AC_MSG_RESULT([found])
    fi
  esac
esac

if test "$use_bdw_gc" = no; then
  OBJC_GCFLAGS=''
  OBJC_BOEHM_GC=''
  OBJC_BOEHM_GC_INCLUDES=''
  OBJC_BOEHM_GC_LIBS=''
else
  OBJC_GCFLAGS='-DOBJC_WITH_GC=1'
  OBJC_BOEHM_GC='libobjc_gc$(libsuffix).la'
  OBJC_BOEHM_GC_INCLUDES=$BDW_GC_CFLAGS
  OBJC_BOEHM_GC_LIBS=$BDW_GC_LIBS
fi
AC_SUBST(OBJC_GCFLAGS)
AC_SUBST(OBJC_BOEHM_GC)
AC_SUBST(OBJC_BOEHM_GC_INCLUDES)
AC_SUBST(OBJC_BOEHM_GC_LIBS)

# Determine what GCC version number to use in filesystem paths.
GCC_BASE_VER

# ------
# Output
# ------

if test ${multilib} = yes; then
  multilib_arg="--enable-multilib"
else
  multilib_arg=
fi

AC_CONFIG_FILES([Makefile])
AC_OUTPUT
Commit	Line	Data
	1	# Process this file with autoconf to produce a configure script.
	2	# Copyright (C) 1994-2025 Free Software Foundation, Inc.
	3	# Originally contributed by Dave Love (d.love@dl.ac.uk).
	4	#
	5	#This file is part of GCC.
	6	#
	7	#GCC is free software; you can redistribute it and/or modify
	8	#it under the terms of the GNU General Public License as published by
	9	#the Free Software Foundation; either version 3, or (at your option)
	10	#any later version.
	11	#
	12	#GCC is distributed in the hope that it will be useful,
	13	#but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	#GNU General Public License for more details.
	16	#
	17	#You should have received a copy of the GNU General Public License
	18	#along with GCC; see the file COPYING3. If not see
	19	#<http://www.gnu.org/licenses/>.
	20
	21	AC_INIT(package-unused, version-unused,, libobjc)
	22	AC_CONFIG_SRCDIR([objc/objc.h])
	23	AC_CONFIG_MACRO_DIRS([../config] [..])
	24	GCC_TOPLEV_SUBDIRS
	25
	26	# We need the following definitions because AC_PROG_LIBTOOL relies on them
	27	PACKAGE=libobjc
	28	# Version is pulled out to make it a bit easier to change using sed.
	29	VERSION=4:0:0
	30	AC_SUBST(VERSION)
	31
	32	# This works around the fact that libtool configuration may change LD
	33	# for this particular configuration, but some shells, instead of
	34	# keeping the changes in LD private, export them just because LD is
	35	# exported.
	36	ORIGINAL_LD_FOR_MULTILIBS=$LD
	37
	38	# -------
	39	# Options
	40	# -------
	41
	42	# We use these options to decide which functions to include.
	43	AC_ARG_WITH(target-subdir,
	44	[ --with-target-subdir=SUBDIR
	45	configuring in a subdirectory])
	46	AC_ARG_WITH(cross-host,
	47	[ --with-cross-host=HOST configuring with a cross compiler])
	48
	49	AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
	50	AC_ARG_ENABLE(version-specific-runtime-libs,
	51	[ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
	52	[case "$enableval" in
	53	yes) version_specific_libs=yes ;;
	54	no) version_specific_libs=no ;;
	55	*) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
	56	esac],
	57	[version_specific_libs=no])
	58	AC_MSG_RESULT($version_specific_libs)
	59
	60	# -----------
	61	# Directories
	62	# -----------
	63
	64	# Find the rest of the source tree framework.
	65	AM_ENABLE_MULTILIB(, ..)
	66
	67	AC_CANONICAL_SYSTEM
	68	ACX_NONCANONICAL_TARGET
	69
	70	# Export source directory.
	71	# These need to be absolute paths, yet at the same time need to
	72	# canonicalize only relative paths, because then amd will not unmount
	73	# drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
	74	case $srcdir in
	75	[\\/$]* \| ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
	76	*) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} \|\| echo "$srcdir"` ;;
	77	esac
	78	AC_SUBST(glibcpp_srcdir)
	79
	80	GCC_WITH_TOOLEXECLIBDIR
	81
	82	# Calculate toolexeclibdir
	83	# Also toolexecdir, though it's only used in toolexeclibdir
	84	case ${version_specific_libs} in
	85	yes)
	86	# Need the gcc compiler version to know where to install libraries
	87	# and header files if --enable-version-specific-runtime-libs option
	88	# is selected.
	89	toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
	90	toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
	91	;;
	92	no)
	93	if test -n "$with_cross_host" &&
	94	test x"$with_cross_host" != x"no"; then
	95	# Install a library built with a cross compiler in tooldir, not libdir.
	96	toolexecdir='$(exec_prefix)/$(target_noncanonical)'
	97	case ${with_toolexeclibdir} in
	98	no)
	99	toolexeclibdir='$(toolexecdir)/lib'
	100	;;
	101	*)
	102	toolexeclibdir=${with_toolexeclibdir}
	103	;;
	104	esac
	105	else
	106	toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
	107	toolexeclibdir='$(libdir)'
	108	fi
	109	multi_os_directory=`$CC -print-multi-os-directory`
	110	case $multi_os_directory in
	111	.) ;; # Avoid trailing /.
	112	*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
	113	esac
	114	;;
	115	esac
	116	AC_SUBST(toolexecdir)
	117	AC_SUBST(toolexeclibdir)
	118
	119	# Figure out if we want to name the include directory and the
	120	# library name changes differently.
	121	includedirname=include
	122	libsuffix=
	123	case "${host}" in
	124	-darwin)
	125	# Darwin is the only target so far that needs a different include directory.
	126	includedirname=include-gnu-runtime
	127	libsuffix=-gnu
	128	;;
	129	esac
	130	AC_SUBST(includedirname)
	131	AC_SUBST(libsuffix)
	132
	133	AC_CONFIG_HEADERS(config.h)
	134
	135	# --------
	136	# Programs
	137	# --------
	138
	139	GCC_NO_EXECUTABLES
	140
	141	# We must force CC to /not/ be a precious variable; otherwise
	142	# the wrong, non-multilib-adjusted value will be used in multilibs.
	143	# As a side effect, we have to subst CFLAGS ourselves.
	144	m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
	145	m4_define([_AC_ARG_VAR_PRECIOUS],[])
	146	AC_PROG_CC
	147	m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
	148
	149	# extra LD Flags which are required for targets
	150	ACX_LT_HOST_FLAGS
	151
	152	# Add CET specific flags if CET is enabled
	153	GCC_CET_FLAGS(CET_FLAGS)
	154	XCFLAGS="$XCFLAGS $CET_FLAGS"
	155
	156	AC_SUBST(CFLAGS)
	157	AC_SUBST(XCFLAGS)
	158
	159	AC_CHECK_TOOL(AS, as)
	160	AC_CHECK_TOOL(AR, ar)
	161	AC_CHECK_TOOL(RANLIB, ranlib, :)
	162	AC_PROG_INSTALL
	163
	164	AM_MAINTAINER_MODE
	165
	166	# Enable Win32 DLL on MS Windows - FIXME
	167	AC_LIBTOOL_WIN32_DLL
	168
	169	AC_PROG_LIBTOOL
	170
	171	AM_PROG_CC_C_O
	172
	173	AC_PROG_MAKE_SET
	174
	175	AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])
	176
	177	# Must come after libtool is initialized.
	178	case "${host}" in
	179	-darwin[[4567]])
	180	# Earlier Darwin versions need -single_module when linking libobjc; they
	181	# do not support @rpath.
	182	extra_ldflags_libobjc='$(lt_host_flags) -Wl,-single_module'
	183	;;
	184	-darwin)
	185	# Otherwise, single_module is the default and multi-module is ignored and
	186	# obsolete.
	187	extra_ldflags_libobjc='$(lt_host_flags)'
	188	if test "x$enable_darwin_at_rpath" = "xyes"; then
	189	extra_ldflags_libobjc="${extra_ldflags_libobjc} -Wc,-nodefaultrpaths"
	190	extra_ldflags_libobjc="${extra_ldflags_libobjc} -Wl,-rpath,@loader_path"
	191	fi
	192	;;
	193	-cygwin\|-mingw)
	194	# Tell libtool to build DLLs on Windows
	195	extra_ldflags_libobjc='$(lt_host_flags)'
	196	;;
	197	esac
	198	AC_SUBST(extra_ldflags_libobjc)
	199
	200	# -------
	201	# Headers
	202	# -------
	203
	204	# Sanity check for the cross-compilation case:
	205	AC_CHECK_HEADER(stdio.h,:,
	206	[AC_MSG_ERROR([Can't find stdio.h.
	207	You must have a usable C system for the target already installed, at least
	208	including headers and, preferably, the library, before you can configure
	209	the Objective C runtime system. If necessary, install gcc now with
	210	\`LANGUAGES=c', then the target library, then build with \`LANGUAGES=objc'.])])
	211
	212	AC_HEADER_STDC
	213
	214	AC_CHECK_HEADERS(sched.h)
	215
	216	# -----------
	217	# Miscellanea
	218	# -----------
	219
	220	# Check if we have thread-local storage
	221	GCC_CHECK_TLS
	222
	223	gt_BITFIELD_TYPE_MATTERS
	224
	225	# -----------
	226	# boehm-gc
	227	# -----------
	228
	229	AC_ARG_ENABLE(objc-gc,
	230	[AS_HELP_STRING([--enable-objc-gc],
	231	[enable use of Boehm's garbage collector with the
	232	GNU Objective-C runtime])],,enable_objc_gc=no)
	233	AC_ARG_WITH([target-bdw-gc],
	234	[AS_HELP_STRING([--with-target-bdw-gc=PATHLIST],
	235	[specify prefix directory for installed bdw-gc package.
	236	Equivalent to --with-target-bdw-gc-include=PATH/include
	237	plus --with-target-bdw-gc-lib=PATH/lib])])
	238	AC_ARG_WITH([target-bdw-gc-include],
	239	[AS_HELP_STRING([--with-target-bdw-gc-include=PATHLIST],
	240	[specify directories for installed bdw-gc include files])])
	241	AC_ARG_WITH([target-bdw-gc-lib],
	242	[AS_HELP_STRING([--with-target-bdw-gc-lib=PATHLIST],
	243	[specify directories for installed bdw-gc library])])
	244
	245	case "$enable_objc_gc" in
	246	no)
	247	use_bdw_gc=no
	248	;;
	249	*)
	250	AC_MSG_CHECKING([for bdw garbage collector])
	251	if test "x$with_target_bdw_gc$with_target_bdw_gc_include$with_target_bdw_gc_lib" = x; then
	252	dnl no bdw-gw options, assuming bdw-gc in default locations
	253	BDW_GC_CFLAGS=
	254	BDW_GC_LIBS="-lgc"
	255	else
	256	dnl bdw-gw options passed by configure flags
	257	if test "x$with_target_bdw_gc_include" = x && test "x$with_target_bdw_gc_lib" != x; then
	258	AC_MSG_ERROR([found --with-target-bdw-gc-lib but --with-target-bdw-gc-include missing])
	259	elif test "x$with_target_bdw_gc_include" != x && test "x$with_target_bdw_gc_lib" = x; then
	260	AC_MSG_ERROR([found --with-target-bdw-gc-include but --with-target-bdw-gc-lib missing])
	261	else
	262	AC_MSG_RESULT([using paths configured with --with-target-bdw-gc options])
	263	fi
	264	mldir=`${CC-gcc} --print-multi-directory 2>/dev/null`
	265	bdw_val=
	266	if test "x$with_target_bdw_gc" != x; then
	267	for i in `echo $with_target_bdw_gc \| tr ',' ' '`; do
	268	case "$i" in
	269	=) sd=${i%%=}; d=${i#=} ;;
	270	*) sd=.; d=$i ;;
	271	esac
	272	if test "$mldir" = "$sd"; then
	273	bdw_val=$d
	274	fi
	275	done
	276	if test "x$bdw_val" = x; then
	277	AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc])
	278	fi
	279	bdw_inc_dir="$bdw_val/include"
	280	bdw_lib_dir="$bdw_val/lib"
	281	fi
	282	bdw_val=
	283	if test "x$with_target_bdw_gc_include" != x; then
	284	for i in `echo $with_target_bdw_gc_include \| tr ',' ' '`; do
	285	case "$i" in
	286	=) sd=${i%%=}; d=${i#=} ;;
	287	*) sd=.; d=$i; fallback=$i ;;
	288	esac
	289	if test "$mldir" = "$sd"; then
	290	bdw_val=$d
	291	fi
	292	done
	293	if test "x$bdw_val" = x && test "x$bdw_inc_dir" = x && test "x$fallback" != x; then
	294	bdw_inc_dir="$fallback"
	295	elif test "x$bdw_val" = x; then
	296	AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-include])
	297	else
	298	bdw_inc_dir="$bdw_val"
	299	fi
	300	fi
	301	bdw_val=
	302	if test "x$with_target_bdw_gc_lib" != x; then
	303	for i in `echo $with_target_bdw_gc_lib \| tr ',' ' '`; do
	304	case "$i" in
	305	=) sd=${i%%=}; d=${i#=} ;;
	306	*) sd=.; d=$i ;;
	307	esac
	308	if test "$mldir" = "$sd"; then
	309	bdw_val=$d
	310	fi
	311	done
	312	if test "x$bdw_val" = x; then
	313	AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-lib])
	314	fi
	315	bdw_lib_dir="$bdw_val"
	316	fi
	317	if test "x$bdw_inc_dir" = x; then
	318	AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-include])
	319	fi
	320	if test "x$bdw_lib_dir" = x; then
	321	AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-lib])
	322	fi
	323	BDW_GC_CFLAGS="-I$bdw_inc_dir"
	324	if test -f $bdw_lib_dir/libgc.la; then
	325	BDW_GC_LIBS="$bdw_lib_dir/libgc.la"
	326	else
	327	BDW_GC_LIBS="-L$bdw_lib_dir -lgc"
	328	fi
	329	AC_MSG_RESULT([found])
	330	fi
	331
	332	case "$BDW_GC_LIBS" in
	333	*libgc.la)
	334	use_bdw_gc=yes
	335	;;
	336	*)
	337	AC_MSG_CHECKING([for system boehm-gc])
	338	save_CFLAGS=$CFLAGS
	339	save_LIBS=$LIBS
	340	CFLAGS="$CFLAGS $BDW_GC_CFLAGS"
	341	LIBS="$LIBS $BDW_GC_LIBS"
	342	dnl the link test is not good enough for ARM32 multilib detection,
	343	dnl first check to link, then to run
	344	AC_LINK_IFELSE(
	345	[AC_LANG_PROGRAM([#include <gc/gc.h>],[GC_init()])],
	346	[
	347	AC_RUN_IFELSE([AC_LANG_SOURCE([[
	348	#include <gc/gc.h>
	349	int main() {
	350	GC_init();
	351	return 0;
	352	}
	353	]])],
	354	[system_bdw_gc_found=yes],
	355	[system_bdw_gc_found=no],
	356	dnl assume no system boehm-gc for cross builds ...
	357	[system_bdw_gc_found=no]
	358	)
	359	],
	360	[system_bdw_gc_found=no])
	361	CFLAGS=$save_CFLAGS
	362	LIBS=$save_LIBS
	363	if test x$enable_objc_gc = xauto && test x$system_bdw_gc_found = xno; then
	364	AC_MSG_WARN([system bdw-gc not found, not building libobjc_gc])
	365	use_bdw_gc=no
	366	elif test x$enable_objc_gc = xyes && test x$system_bdw_gc_found = xno; then
	367	AC_MSG_ERROR([system bdw-gc required but not found])
	368	else
	369	use_bdw_gc=yes
	370	AC_MSG_RESULT([found])
	371	fi
	372	esac
	373	esac
	374
	375	if test "$use_bdw_gc" = no; then
	376	OBJC_GCFLAGS=''
	377	OBJC_BOEHM_GC=''
	378	OBJC_BOEHM_GC_INCLUDES=''
	379	OBJC_BOEHM_GC_LIBS=''
	380	else
	381	OBJC_GCFLAGS='-DOBJC_WITH_GC=1'
	382	OBJC_BOEHM_GC='libobjc_gc$(libsuffix).la'
	383	OBJC_BOEHM_GC_INCLUDES=$BDW_GC_CFLAGS
	384	OBJC_BOEHM_GC_LIBS=$BDW_GC_LIBS
	385	fi
	386	AC_SUBST(OBJC_GCFLAGS)
	387	AC_SUBST(OBJC_BOEHM_GC)
	388	AC_SUBST(OBJC_BOEHM_GC_INCLUDES)
	389	AC_SUBST(OBJC_BOEHM_GC_LIBS)
	390
	391	# Determine what GCC version number to use in filesystem paths.
	392	GCC_BASE_VER
	393
	394	# ------
	395	# Output
	396	# ------
	397
	398	if test ${multilib} = yes; then
	399	multilib_arg="--enable-multilib"
	400	else
	401	multilib_arg=
	402	fi
	403
	404	AC_CONFIG_FILES([Makefile])
	405	AC_OUTPUT