libitm/configure.ac - rust-lang/gcc - Git at Google


            
            # Process this file with autoreconf to produce a configure script.

            
            #   Copyright (C) 2011-2026 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

            
            LT_INIT

            
            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_HEADER_STDC

            
            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.

            
            GCC_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) 2011-2026 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
	LT_INIT
	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_HEADER_STDC
	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.
	GCC_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