libitm/configure.ac - gcc - Git at Google

 # Process this file with autoreconf to produce a configure script.
 #   Copyright (C) 2011-2024 Free Software Foundation, Inc.

 # This program 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 2 of the License, or
 # (at your option) any later version.
 #
 # This program 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 this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 AC_INIT([GNU TM Runtime Library], 1.0,,[libitm])
 AC_CONFIG_HEADER(config.h)

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

 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
 LIBITM_ENABLE(version-specific-runtime-libs, no, ,
    [Specify that runtime libraries should be installed in a compiler-specific directory],
    permit yes|no)
 AC_MSG_RESULT($enable_version_specific_runtime_libs)

 # We would like our source tree to be readonly. However when releases or
 # pre-releases are generated, the flex/bison generated files as well as the
 # various formats of manuals need to be included along with the rest of the
 # sources.  Therefore we have --enable-generated-files-in-srcdir to do
 # just that.
 AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
 LIBITM_ENABLE(generated-files-in-srcdir, no, ,
    [put copies of generated files in source dir intended for creating source
     tarballs for users without texinfo bison or flex.],
    permit yes|no)
 AC_MSG_RESULT($enable_generated_files_in_srcdir)
 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)


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

 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
 #
 # You will slowly go insane if you do not grok the following fact:  when
 # building this library, the top-level /target/ becomes the library's /host/.
 #
 # configure then causes --target to default to --host, exactly like any
 # other package using autoconf.  Therefore, 'target' and 'host' will
 # always be the same.  This makes sense both for native and cross compilers
 # just think about it for a little while.  :-)
 #
 # Also, if this library is being configured as part of a cross compiler, the
 # top-level configure script will pass the "real" host as $with_cross_host.
 #
 # Do not delete or change the following two lines.  For why, see
 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
 AC_CANONICAL_SYSTEM
 target_alias=${target_alias-$host_alias}

 # Sets up automake.  Must come after AC_CANONICAL_SYSTEM.  Each of the
 # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
 #  1.9.0:  minimum required version
 #  no-define:  PACKAGE and VERSION will not be #define'd in config.h (a bunch
 #              of other PACKAGE_* variables will, however, and there's nothing
 #              we can do about that; they come from AC_INIT).
 #  no-dist:  we don't want 'dist' and related rules.
 #  foreign:  we don't follow the normal rules for GNU packages (no COPYING
 #            file in the top srcdir, etc, etc), so stop complaining.
 #  -Wall:  turns on all automake warnings...
 #  -Wno-portability:  ...except this one, since GNU make is required.
 #  -Wno-override: ... and this one, since we do want this in testsuite.
 AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
 AM_ENABLE_MULTILIB(, ..)

 GCC_WITH_TOOLEXECLIBDIR

 # Calculate toolexeclibdir
 # Also toolexecdir, though it's only used in toolexeclibdir
 case ${enable_version_specific_runtime_libs} in
   yes)
     # Need the gcc compiler version to know where to install libraries
     # and header files if --enable-version-specific-runtime-libs option
     # is selected.
     toolexecdir='$(libdir)/gcc/$(target_alias)'
     toolexeclibdir='$(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_alias)'
       case ${with_toolexeclibdir} in
 	no)
 	  toolexeclibdir='$(toolexecdir)/lib'
 	  ;;
 	*)
 	  toolexeclibdir=${with_toolexeclibdir}
 	  ;;
       esac
     else
       toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
       toolexeclibdir='$(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)

 # Check the compiler.
 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
 # We must force CC to /not/ be precious variables; 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
 AC_PROG_CXX
 AM_PROG_AS
 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

 AC_SUBST(CFLAGS)

 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
 # in XCFLAGS.  But we need them in CFLAGS during configury.  So put them
 # in both places for now and restore CFLAGS at the end of config.
 save_CFLAGS="$CFLAGS"

 # Find other programs we need.
 AC_CHECK_TOOL(AR, ar)
 AC_CHECK_TOOL(NM, nm)
 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL

 # See if makeinfo has been installed and is modern enough
 # that we can use it.
 ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
                    [GNU texinfo.* \([0-9][0-9.]*\)],
                    [4.[4-9]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])
 AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")


 # Configure libtool
 AM_PROG_LIBTOOL
 AC_SUBST(enable_shared)
 AC_SUBST(enable_static)
 AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])

 AM_MAINTAINER_MODE

 # For libtool versioning info, format is CURRENT:REVISION:AGE
 libtool_VERSION=1:0:0
 AC_SUBST(libtool_VERSION)

 # Check header files.
 AC_STDC_HEADERS
 AC_HEADER_TIME
 ACX_HEADER_STRING
 AC_CHECK_HEADERS(unistd.h semaphore.h sys/time.h sys/auxv.h malloc.h)

 GCC_HEADER_STDINT(gstdint.h)

 GCC_AC_FUNC_MMAP_BLACKLIST

 AC_C_BIGENDIAN
 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
 AH_BOTTOM(
 [#ifndef WORDS_BIGENDIAN
 #define WORDS_BIGENDIAN 0
 #endif])

 # Check to see if -pthread or -lpthread is needed.  Prefer the former.
 # In case the pthread.h system header is not found, this test will fail.
 XPCFLAGS=""
 CFLAGS="$CFLAGS -pthread"
 AC_LINK_IFELSE(
  [AC_LANG_PROGRAM(
   [#include <pthread.h>
    void *g(void *d) { return NULL; }],
   [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
  [XPCFLAGS=" -Wc,-pthread"],
  [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
   AC_LINK_IFELSE(
    [AC_LANG_PROGRAM(
     [#include <pthread.h>
      void *g(void *d) { return NULL; }],
     [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
    [],
    [AC_MSG_ERROR([Pthreads are required to build libitm])])])

 # Check for functions needed.
 AC_CHECK_FUNCS(strtoull memalign posix_memalign getauxval)

 # Check for broken semaphore implementation on darwin.
 # sem_init returns: sem_init error: Function not implemented.
 case "$host" in
   *-darwin*)
     AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
 	Define if the POSIX Semaphores do not work on your system.)
     ;;
 esac

 GCC_LINUX_FUTEX(:)

 # See if we support thread-local storage.
 GCC_CHECK_TLS

 # See what sort of export controls are available.
 LIBITM_CHECK_ATTRIBUTE_VISIBILITY
 LIBITM_CHECK_ATTRIBUTE_DLLEXPORT
 LIBITM_CHECK_ATTRIBUTE_ALIAS

 # Check linker hardware capability support.
 GCC_CHECK_LINKER_HWCAP
 # If defaulting to -mavx, don't clear hwcaps.
 AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])

 LIBITM_ENABLE_SYMVERS
 if test $enable_symvers = gnu; then
   AC_DEFINE(LIBITM_GNU_SYMBOL_VERSIONING, 1,
 	    [Define to 1 if GNU symbol versioning is used for libitm.])
 fi

 # See if we can emit unwind info in the sjlj stub.
 GCC_AS_CFI_PSEUDO_OP

 # Determine the proper ABI type for size_t.
 LIBITM_CHECK_SIZE_T_MANGLING

 # Get target configury.
 . ${srcdir}/configure.tgt
 if test -n "$UNSUPPORTED"; then
   AC_MSG_ERROR([Configuration ${target} is unsupported.])
 fi

 CFLAGS="$save_CFLAGS $XCFLAGS"

 # Check for __sync_val_compare_and_swap, but only after the target has
 # had a chance to set XCFLAGS.
 LIBITM_CHECK_SYNC_BUILTINS
 LIBITM_CHECK_64BIT_SYNC_BUILTINS
 LIBITM_CHECK_AS_AVX
 LIBITM_CHECK_AS_RTM
 LIBITM_CHECK_AS_HTM

 GCC_CHECK_ELF_STYLE_WEAKREF

 # Cleanup and exit.
 CFLAGS="$save_CFLAGS"
 AC_CACHE_SAVE

 AC_ARG_ENABLE([werror],
   [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
 # Add -Wall -Werror if we are using GCC.
 AS_IF([test "x$GCC" = "xyes"],
   [XCFLAGS="$XCFLAGS -Wall"])
 AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
   [XCFLAGS="$XCFLAGS -Werror"])

 XCFLAGS="$XCFLAGS $XPCFLAGS"

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

 AC_SUBST(config_path)
 AC_SUBST(XCFLAGS)
 AC_SUBST(XLDFLAGS)

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

 # Set up the set of libraries that we need to link against for libitm.
 # Note that the GTM_SELF_SPECS in gcc.c will force -pthread for -fgnu-tm,
 # which will force linkage against -lpthread (or equivalent for the system).
 # That's not 100% ideal, but about the best we can do easily.
 if test $enable_shared = yes; then
   link_itm="-litm %{static: $LIBS}"
 else
   link_itm="-litm $LIBS"
 fi
 AC_SUBST(link_itm)

 AM_CONDITIONAL([ARCH_ARM], [test "$ARCH" = arm])
 AM_CONDITIONAL([ARCH_X86], [test "$ARCH" = x86])
 AM_CONDITIONAL([ARCH_X86_AVX], [test "$libitm_cv_as_avx" = yes])
 AM_CONDITIONAL([ARCH_FUTEX], [test $enable_linux_futex = yes])

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

 AC_CONFIG_FILES(Makefile testsuite/Makefile libitm.spec)
 AC_OUTPUT
	# Process this file with autoreconf to produce a configure script.
	# Copyright (C) 2011-2024 Free Software Foundation, Inc.

	# This program 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 2 of the License, or
	# (at your option) any later version.
	#
	# This program 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 this program; if not, write to the Free Software
	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

	AC_INIT([GNU TM Runtime Library], 1.0,,[libitm])
	AC_CONFIG_HEADER(config.h)

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

	AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
	LIBITM_ENABLE(version-specific-runtime-libs, no, ,
	[Specify that runtime libraries should be installed in a compiler-specific directory],
	permit yes\|no)
	AC_MSG_RESULT($enable_version_specific_runtime_libs)

	# We would like our source tree to be readonly. However when releases or
	# pre-releases are generated, the flex/bison generated files as well as the
	# various formats of manuals need to be included along with the rest of the
	# sources. Therefore we have --enable-generated-files-in-srcdir to do
	# just that.
	AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
	LIBITM_ENABLE(generated-files-in-srcdir, no, ,
	[put copies of generated files in source dir intended for creating source
	tarballs for users without texinfo bison or flex.],
	permit yes\|no)
	AC_MSG_RESULT($enable_generated_files_in_srcdir)
	AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)


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

	# Gets build, host, target, _vendor, _cpu, *_os, etc.
	#
	# You will slowly go insane if you do not grok the following fact: when
	# building this library, the top-level /target/ becomes the library's /host/.
	#
	# configure then causes --target to default to --host, exactly like any
	# other package using autoconf. Therefore, 'target' and 'host' will
	# always be the same. This makes sense both for native and cross compilers
	# just think about it for a little while. :-)
	#
	# Also, if this library is being configured as part of a cross compiler, the
	# top-level configure script will pass the "real" host as $with_cross_host.
	#
	# Do not delete or change the following two lines. For why, see
	# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
	AC_CANONICAL_SYSTEM
	target_alias=${target_alias-$host_alias}

	# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
	# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
	# 1.9.0: minimum required version
	# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
	# of other PACKAGE_* variables will, however, and there's nothing
	# we can do about that; they come from AC_INIT).
	# no-dist: we don't want 'dist' and related rules.
	# foreign: we don't follow the normal rules for GNU packages (no COPYING
	# file in the top srcdir, etc, etc), so stop complaining.
	# -Wall: turns on all automake warnings...
	# -Wno-portability: ...except this one, since GNU make is required.
	# -Wno-override: ... and this one, since we do want this in testsuite.
	AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
	AM_ENABLE_MULTILIB(, ..)

	GCC_WITH_TOOLEXECLIBDIR

	# Calculate toolexeclibdir
	# Also toolexecdir, though it's only used in toolexeclibdir
	case ${enable_version_specific_runtime_libs} in
	yes)
	# Need the gcc compiler version to know where to install libraries
	# and header files if --enable-version-specific-runtime-libs option
	# is selected.
	toolexecdir='$(libdir)/gcc/$(target_alias)'
	toolexeclibdir='$(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_alias)'
	case ${with_toolexeclibdir} in
	no)
	toolexeclibdir='$(toolexecdir)/lib'
	;;
	*)
	toolexeclibdir=${with_toolexeclibdir}
	;;
	esac
	else
	toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
	toolexeclibdir='$(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)

	# Check the compiler.
	# The same as in boehm-gc and libstdc++. Have to borrow it from there.
	# We must force CC to /not/ be precious variables; 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
	AC_PROG_CXX
	AM_PROG_AS
	m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

	AC_SUBST(CFLAGS)

	# In order to override CFLAGS_FOR_TARGET, all of our special flags go
	# in XCFLAGS. But we need them in CFLAGS during configury. So put them
	# in both places for now and restore CFLAGS at the end of config.
	save_CFLAGS="$CFLAGS"

	# Find other programs we need.
	AC_CHECK_TOOL(AR, ar)
	AC_CHECK_TOOL(NM, nm)
	AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
	AC_PROG_MAKE_SET
	AC_PROG_INSTALL

	# See if makeinfo has been installed and is modern enough
	# that we can use it.
	ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
	[GNU texinfo.* \([0-9][0-9.]*\)],
	[4.[4-9]\|4.[1-9][0-9]\|[5-9]\|[1-9][0-9]])
	AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")


	# Configure libtool
	AM_PROG_LIBTOOL
	AC_SUBST(enable_shared)
	AC_SUBST(enable_static)
	AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])

	AM_MAINTAINER_MODE

	# For libtool versioning info, format is CURRENT:REVISION:AGE
	libtool_VERSION=1:0:0
	AC_SUBST(libtool_VERSION)

	# Check header files.
	AC_STDC_HEADERS
	AC_HEADER_TIME
	ACX_HEADER_STRING
	AC_CHECK_HEADERS(unistd.h semaphore.h sys/time.h sys/auxv.h malloc.h)

	GCC_HEADER_STDINT(gstdint.h)

	GCC_AC_FUNC_MMAP_BLACKLIST

	AC_C_BIGENDIAN
	# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
	AH_BOTTOM(
	[#ifndef WORDS_BIGENDIAN
	#define WORDS_BIGENDIAN 0
	#endif])

	# Check to see if -pthread or -lpthread is needed. Prefer the former.
	# In case the pthread.h system header is not found, this test will fail.
	XPCFLAGS=""
	CFLAGS="$CFLAGS -pthread"
	AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	[#include <pthread.h>
	void g(void d) { return NULL; }],
	[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
	[XPCFLAGS=" -Wc,-pthread"],
	[CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
	AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	[#include <pthread.h>
	void g(void d) { return NULL; }],
	[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
	[],
	[AC_MSG_ERROR([Pthreads are required to build libitm])])])

	# Check for functions needed.
	AC_CHECK_FUNCS(strtoull memalign posix_memalign getauxval)

	# Check for broken semaphore implementation on darwin.
	# sem_init returns: sem_init error: Function not implemented.
	case "$host" in
	-darwin)
	AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
	Define if the POSIX Semaphores do not work on your system.)
	;;
	esac

	GCC_LINUX_FUTEX(:)

	# See if we support thread-local storage.
	GCC_CHECK_TLS

	# See what sort of export controls are available.
	LIBITM_CHECK_ATTRIBUTE_VISIBILITY
	LIBITM_CHECK_ATTRIBUTE_DLLEXPORT
	LIBITM_CHECK_ATTRIBUTE_ALIAS

	# Check linker hardware capability support.
	GCC_CHECK_LINKER_HWCAP
	# If defaulting to -mavx, don't clear hwcaps.
	AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])

	LIBITM_ENABLE_SYMVERS
	if test $enable_symvers = gnu; then
	AC_DEFINE(LIBITM_GNU_SYMBOL_VERSIONING, 1,
	[Define to 1 if GNU symbol versioning is used for libitm.])
	fi

	# See if we can emit unwind info in the sjlj stub.
	GCC_AS_CFI_PSEUDO_OP

	# Determine the proper ABI type for size_t.
	LIBITM_CHECK_SIZE_T_MANGLING

	# Get target configury.
	. ${srcdir}/configure.tgt
	if test -n "$UNSUPPORTED"; then
	AC_MSG_ERROR([Configuration ${target} is unsupported.])
	fi

	CFLAGS="$save_CFLAGS $XCFLAGS"

	# Check for __sync_val_compare_and_swap, but only after the target has
	# had a chance to set XCFLAGS.
	LIBITM_CHECK_SYNC_BUILTINS
	LIBITM_CHECK_64BIT_SYNC_BUILTINS
	LIBITM_CHECK_AS_AVX
	LIBITM_CHECK_AS_RTM
	LIBITM_CHECK_AS_HTM

	GCC_CHECK_ELF_STYLE_WEAKREF

	# Cleanup and exit.
	CFLAGS="$save_CFLAGS"
	AC_CACHE_SAVE

	AC_ARG_ENABLE([werror],
	[AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
	# Add -Wall -Werror if we are using GCC.
	AS_IF([test "x$GCC" = "xyes"],
	[XCFLAGS="$XCFLAGS -Wall"])
	AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
	[XCFLAGS="$XCFLAGS -Werror"])

	XCFLAGS="$XCFLAGS $XPCFLAGS"

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

	AC_SUBST(config_path)
	AC_SUBST(XCFLAGS)
	AC_SUBST(XLDFLAGS)

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

	# Set up the set of libraries that we need to link against for libitm.
	# Note that the GTM_SELF_SPECS in gcc.c will force -pthread for -fgnu-tm,
	# which will force linkage against -lpthread (or equivalent for the system).
	# That's not 100% ideal, but about the best we can do easily.
	if test $enable_shared = yes; then
	link_itm="-litm %{static: $LIBS}"
	else
	link_itm="-litm $LIBS"
	fi
	AC_SUBST(link_itm)

	AM_CONDITIONAL([ARCH_ARM], [test "$ARCH" = arm])
	AM_CONDITIONAL([ARCH_X86], [test "$ARCH" = x86])
	AM_CONDITIONAL([ARCH_X86_AVX], [test "$libitm_cv_as_avx" = yes])
	AM_CONDITIONAL([ARCH_FUTEX], [test $enable_linux_futex = yes])

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

	AC_CONFIG_FILES(Makefile testsuite/Makefile libitm.spec)
	AC_OUTPUT