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

# 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
Commit	Line	Data
0a35513e	1	# Process this file with autoreconf to produce a configure script.
a945c346	2	# Copyright (C) 2011-2024 Free Software Foundation, Inc.
0a35513e AH	3
	4	# This program is free software; you can redistribute it and/or modify
	5	# it under the terms of the GNU General Public License as published by
	6	# the Free Software Foundation; either version 2 of the License, or
	7	# (at your option) any later version.
	8	#
	9	# This program is distributed in the hope that it will be useful,
	10	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	# GNU General Public License for more details.
	13	#
	14	# You should have received a copy of the GNU General Public License
	15	# along with this program; if not, write to the Free Software
	16	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	17
0a35513e AH	18	AC_INIT([GNU TM Runtime Library], 1.0,,[libitm])
	19	AC_CONFIG_HEADER(config.h)
	20
	21	# -------
	22	# Options
	23	# -------
	24
	25	AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
	26	LIBITM_ENABLE(version-specific-runtime-libs, no, ,
	27	[Specify that runtime libraries should be installed in a compiler-specific directory],
	28	permit yes\|no)
	29	AC_MSG_RESULT($enable_version_specific_runtime_libs)
	30
	31	# We would like our source tree to be readonly. However when releases or
	32	# pre-releases are generated, the flex/bison generated files as well as the
	33	# various formats of manuals need to be included along with the rest of the
	34	# sources. Therefore we have --enable-generated-files-in-srcdir to do
	35	# just that.
	36	AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
	37	LIBITM_ENABLE(generated-files-in-srcdir, no, ,
	38	[put copies of generated files in source dir intended for creating source
	39	tarballs for users without texinfo bison or flex.],
	40	permit yes\|no)
	41	AC_MSG_RESULT($enable_generated_files_in_srcdir)
	42	AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
	43
	44
	45	# -------
	46	# -------
	47
	48	# Gets build, host, target, _vendor, _cpu, *_os, etc.
	49	#
	50	# You will slowly go insane if you do not grok the following fact: when
	51	# building this library, the top-level /target/ becomes the library's /host/.
	52	#
	53	# configure then causes --target to default to --host, exactly like any
	54	# other package using autoconf. Therefore, 'target' and 'host' will
	55	# always be the same. This makes sense both for native and cross compilers
	56	# just think about it for a little while. :-)
	57	#
	58	# Also, if this library is being configured as part of a cross compiler, the
	59	# top-level configure script will pass the "real" host as $with_cross_host.
	60	#
	61	# Do not delete or change the following two lines. For why, see
	62	# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
	63	AC_CANONICAL_SYSTEM
	64	target_alias=${target_alias-$host_alias}
	65
	66	# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
	67	# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
	68	# 1.9.0: minimum required version
	69	# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
	70	# of other PACKAGE_* variables will, however, and there's nothing
	71	# we can do about that; they come from AC_INIT).
c0758df9	72	# no-dist: we don't want 'dist' and related rules.
0a35513e AH	73	# foreign: we don't follow the normal rules for GNU packages (no COPYING
	74	# file in the top srcdir, etc, etc), so stop complaining.
	75	# -Wall: turns on all automake warnings...
	76	# -Wno-portability: ...except this one, since GNU make is required.
	77	# -Wno-override: ... and this one, since we do want this in testsuite.
c0758df9	78	AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
0a35513e AH	79	AM_ENABLE_MULTILIB(, ..)
0a35513e AH	80
e8e66971 MR	81	GCC_WITH_TOOLEXECLIBDIR
e8e66971 MR	82
0a35513e AH	83	# Calculate toolexeclibdir
	84	# Also toolexecdir, though it's only used in toolexeclibdir
	85	case ${enable_version_specific_runtime_libs} in
	86	yes)
	87	# Need the gcc compiler version to know where to install libraries
	88	# and header files if --enable-version-specific-runtime-libs option
	89	# is selected.
	90	toolexecdir='$(libdir)/gcc/$(target_alias)'
	91	toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
	92	;;
	93	no)
	94	if test -n "$with_cross_host" &&
	95	test x"$with_cross_host" != x"no"; then
	96	# Install a library built with a cross compiler in tooldir, not libdir.
	97	toolexecdir='$(exec_prefix)/$(target_alias)'
e8e66971 MR	98	case ${with_toolexeclibdir} in
	99	no)
	100	toolexeclibdir='$(toolexecdir)/lib'
	101	;;
	102	*)
	103	toolexeclibdir=${with_toolexeclibdir}
	104	;;
	105	esac
0a35513e AH	106	else
	107	toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
	108	toolexeclibdir='$(libdir)'
	109	fi
	110	multi_os_directory=`$CC -print-multi-os-directory`
	111	case $multi_os_directory in
	112	.) ;; # Avoid trailing /.
	113	*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
	114	esac
	115	;;
	116	esac
	117	AC_SUBST(toolexecdir)
	118	AC_SUBST(toolexeclibdir)
	119
	120	# Check the compiler.
	121	# The same as in boehm-gc and libstdc++. Have to borrow it from there.
	122	# We must force CC to /not/ be precious variables; otherwise
	123	# the wrong, non-multilib-adjusted value will be used in multilibs.
	124	# As a side effect, we have to subst CFLAGS ourselves.
	125
	126	m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
	127	m4_define([_AC_ARG_VAR_PRECIOUS],[])
	128	AC_PROG_CC
	129	AC_PROG_CXX
	130	AM_PROG_AS
	131	m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
	132
	133	AC_SUBST(CFLAGS)
	134
	135	# In order to override CFLAGS_FOR_TARGET, all of our special flags go
	136	# in XCFLAGS. But we need them in CFLAGS during configury. So put them
	137	# in both places for now and restore CFLAGS at the end of config.
	138	save_CFLAGS="$CFLAGS"
	139
	140	# Find other programs we need.
	141	AC_CHECK_TOOL(AR, ar)
	142	AC_CHECK_TOOL(NM, nm)
	143	AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
0a35513e AH	144	AC_PROG_MAKE_SET
	145	AC_PROG_INSTALL
	146
	147	# See if makeinfo has been installed and is modern enough
	148	# that we can use it.
	149	ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
	150	[GNU texinfo.* \([0-9][0-9.]*\)],
	151	[4.[4-9]\|4.[1-9][0-9]\|[5-9]\|[1-9][0-9]])
	152	AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")
	153
	154
	155	# Configure libtool
	156	AM_PROG_LIBTOOL
	157	AC_SUBST(enable_shared)
	158	AC_SUBST(enable_static)
6a6d3817	159	AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])
0a35513e AH	160
	161	AM_MAINTAINER_MODE
	162
	163	# For libtool versioning info, format is CURRENT:REVISION:AGE
	164	libtool_VERSION=1:0:0
	165	AC_SUBST(libtool_VERSION)
	166
	167	# Check header files.
	168	AC_STDC_HEADERS
	169	AC_HEADER_TIME
	170	ACX_HEADER_STRING
0258b6e4	171	AC_CHECK_HEADERS(unistd.h semaphore.h sys/time.h sys/auxv.h malloc.h)
0a35513e AH	172
	173	GCC_HEADER_STDINT(gstdint.h)
	174
	175	GCC_AC_FUNC_MMAP_BLACKLIST
	176
	177	AC_C_BIGENDIAN
	178	# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
	179	AH_BOTTOM(
	180	[#ifndef WORDS_BIGENDIAN
	181	#define WORDS_BIGENDIAN 0
	182	#endif])
	183
	184	# Check to see if -pthread or -lpthread is needed. Prefer the former.
	185	# In case the pthread.h system header is not found, this test will fail.
	186	XPCFLAGS=""
	187	CFLAGS="$CFLAGS -pthread"
	188	AC_LINK_IFELSE(
	189	[AC_LANG_PROGRAM(
	190	[#include <pthread.h>
	191	void g(void d) { return NULL; }],
	192	[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
	193	[XPCFLAGS=" -Wc,-pthread"],
	194	[CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
	195	AC_LINK_IFELSE(
	196	[AC_LANG_PROGRAM(
	197	[#include <pthread.h>
	198	void g(void d) { return NULL; }],
	199	[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
	200	[],
	201	[AC_MSG_ERROR([Pthreads are required to build libitm])])])
	202
	203	# Check for functions needed.
0258b6e4	204	AC_CHECK_FUNCS(strtoull memalign posix_memalign getauxval)
0a35513e AH	205
	206	# Check for broken semaphore implementation on darwin.
	207	# sem_init returns: sem_init error: Function not implemented.
	208	case "$host" in
	209	-darwin)
	210	AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
	211	Define if the POSIX Semaphores do not work on your system.)
	212	;;
	213	esac
	214
	215	GCC_LINUX_FUTEX(:)
	216
	217	# See if we support thread-local storage.
	218	GCC_CHECK_TLS
	219
9ce91011	220	# See what sort of export controls are available.
0a35513e AH	221	LIBITM_CHECK_ATTRIBUTE_VISIBILITY
	222	LIBITM_CHECK_ATTRIBUTE_DLLEXPORT
	223	LIBITM_CHECK_ATTRIBUTE_ALIAS
0a35513e	224
9ce91011	225	# Check linker hardware capability support.
66dbcf2d	226	GCC_CHECK_LINKER_HWCAP
9ce91011 RO	227	# If defaulting to -mavx, don't clear hwcaps.
	228	AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])
	229
	230	LIBITM_ENABLE_SYMVERS
0a35513e AH	231	if test $enable_symvers = gnu; then
	232	AC_DEFINE(LIBITM_GNU_SYMBOL_VERSIONING, 1,
	233	[Define to 1 if GNU symbol versioning is used for libitm.])
	234	fi
	235
4bdd090f RH	236	# See if we can emit unwind info in the sjlj stub.
	237	GCC_AS_CFI_PSEUDO_OP
	238
0a35513e AH	239	# Determine the proper ABI type for size_t.
	240	LIBITM_CHECK_SIZE_T_MANGLING
	241
	242	# Get target configury.
	243	. ${srcdir}/configure.tgt
01f3428c RH	244	if test -n "$UNSUPPORTED"; then
	245	AC_MSG_ERROR([Configuration ${target} is unsupported.])
	246	fi
	247
0a35513e AH	248	CFLAGS="$save_CFLAGS $XCFLAGS"
	249
	250	# Check for __sync_val_compare_and_swap, but only after the target has
	251	# had a chance to set XCFLAGS.
	252	LIBITM_CHECK_SYNC_BUILTINS
	253	LIBITM_CHECK_64BIT_SYNC_BUILTINS
430616e7	254	LIBITM_CHECK_AS_AVX
07d3b5c8	255	LIBITM_CHECK_AS_RTM
0258b6e4	256	LIBITM_CHECK_AS_HTM
0a35513e	257
8cf36bb3 IS	258	GCC_CHECK_ELF_STYLE_WEAKREF
8cf36bb3 IS	259
0a35513e AH	260	# Cleanup and exit.
	261	CFLAGS="$save_CFLAGS"
	262	AC_CACHE_SAVE
	263
45ba6bf2 DS	264	AC_ARG_ENABLE([werror],
45ba6bf2 DS	265	[AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
0a35513e	266	# Add -Wall -Werror if we are using GCC.
45ba6bf2 DS	267	AS_IF([test "x$GCC" = "xyes"],
	268	[XCFLAGS="$XCFLAGS -Wall"])
	269	AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
	270	[XCFLAGS="$XCFLAGS -Werror"])
0a35513e AH	271
	272	XCFLAGS="$XCFLAGS $XPCFLAGS"
	273
c51081fc IT	274	# Add CET specific flags if CET is enabled
	275	GCC_CET_FLAGS(CET_FLAGS)
	276	XCFLAGS="$XCFLAGS $CET_FLAGS"
	277
0a35513e AH	278	AC_SUBST(config_path)
	279	AC_SUBST(XCFLAGS)
	280	AC_SUBST(XLDFLAGS)
	281
	282	if test ${multilib} = yes; then
	283	multilib_arg="--enable-multilib"
	284	else
	285	multilib_arg=
	286	fi
	287
	288	# Set up the set of libraries that we need to link against for libitm.
255a9a1b	289	# Note that the GTM_SELF_SPECS in gcc.c will force -pthread for -fgnu-tm,
0a35513e AH	290	# which will force linkage against -lpthread (or equivalent for the system).
	291	# That's not 100% ideal, but about the best we can do easily.
	292	if test $enable_shared = yes; then
	293	link_itm="-litm %{static: $LIBS}"
	294	else
	295	link_itm="-litm $LIBS"
	296	fi
	297	AC_SUBST(link_itm)
	298
aebac0ca	299	AM_CONDITIONAL([ARCH_ARM], [test "$ARCH" = arm])
0a35513e	300	AM_CONDITIONAL([ARCH_X86], [test "$ARCH" = x86])
d4b17902	301	AM_CONDITIONAL([ARCH_X86_AVX], [test "$libitm_cv_as_avx" = yes])
0a35513e AH	302	AM_CONDITIONAL([ARCH_FUTEX], [test $enable_linux_futex = yes])
0a35513e AH	303
3c36aa6b JJ	304	# Determine what GCC version number to use in filesystem paths.
	305	GCC_BASE_VER
	306
0a35513e AH	307	AC_CONFIG_FILES(Makefile testsuite/Makefile libitm.spec)
0a35513e AH	308	AC_OUTPUT