1 # Process this file with autoreconf to produce a configure script.
2 # Copyright (C) 2011-2023 Free Software Foundation, Inc.
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.
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.
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.
18 AC_INIT([GNU TM Runtime Library], 1.0,,[libitm])
19 AC_CONFIG_HEADER(config.h)
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],
29 AC_MSG_RESULT($enable_version_specific_runtime_libs)
31 # We would like our source tree to be readonly. However when releases or
32 # pre-releases are generated, the flex/bison generated files as well as the
33 # various formats of manuals need to be included along with the rest of the
34 # sources. Therefore we have --enable-generated-files-in-srcdir to do
36 AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
37 LIBITM_ENABLE(generated-files-in-srcdir, no, ,
38 [put copies of generated files in source dir intended for creating source
39 tarballs for users without texinfo bison or flex.],
41 AC_MSG_RESULT($enable_generated_files_in_srcdir)
42 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
48 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
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/.
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. :-)
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 $with_cross_host.
61 # Do not delete or change the following two lines. For why, see
62 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
64 target_alias=${target_alias-$host_alias}
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).
72 # no-dist: we don't want 'dist' and related rules.
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.
78 AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
79 AM_ENABLE_MULTILIB(, ..)
81 GCC_WITH_TOOLEXECLIBDIR
83 # Calculate toolexeclibdir
84 # Also toolexecdir, though it's only used in toolexeclibdir
85 case ${enable_version_specific_runtime_libs} in
87 # Need the gcc compiler version to know where to install libraries
88 # and header files if --enable-version-specific-runtime-libs option
90 toolexecdir='$(libdir)/gcc/$(target_alias)'
91 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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)'
98 case ${with_toolexeclibdir} in
100 toolexeclibdir='$(toolexecdir)/lib'
103 toolexeclibdir=${with_toolexeclibdir}
107 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
108 toolexeclibdir='$(libdir)'
110 multi_os_directory=`$CC -print-multi-os-directory`
111 case $multi_os_directory in
112 .) ;; # Avoid trailing /.
113 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
117 AC_SUBST(toolexecdir)
118 AC_SUBST(toolexeclibdir)
120 # Check the compiler.
121 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
122 # We must force CC to /not/ be precious variables; otherwise
123 # the wrong, non-multilib-adjusted value will be used in multilibs.
124 # As a side effect, we have to subst CFLAGS ourselves.
126 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
127 m4_define([_AC_ARG_VAR_PRECIOUS],[])
131 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
135 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
136 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
137 # in both places for now and restore CFLAGS at the end of config.
138 save_CFLAGS="$CFLAGS"
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)
144 AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)
148 # See if makeinfo has been installed and is modern enough
149 # that we can use it.
150 ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
151 [GNU texinfo.* \([0-9][0-9.]*\)],
152 [4.[4-9]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])
153 AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")
158 AC_SUBST(enable_shared)
159 AC_SUBST(enable_static)
163 # For libtool versioning info, format is CURRENT:REVISION:AGE
164 libtool_VERSION=1:0:0
165 AC_SUBST(libtool_VERSION)
167 # Check header files.
171 AC_CHECK_HEADERS(unistd.h semaphore.h sys/time.h sys/auxv.h malloc.h)
173 GCC_HEADER_STDINT(gstdint.h)
175 GCC_AC_FUNC_MMAP_BLACKLIST
178 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
180 [#ifndef WORDS_BIGENDIAN
181 #define WORDS_BIGENDIAN 0
184 # Check to see if -pthread or -lpthread is needed. Prefer the former.
185 # In case the pthread.h system header is not found, this test will fail.
187 CFLAGS="$CFLAGS -pthread"
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"
197 [#include <pthread.h>
198 void *g(void *d) { return NULL; }],
199 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
201 [AC_MSG_ERROR([Pthreads are required to build libitm])])])
203 # Check for functions needed.
204 AC_CHECK_FUNCS(strtoull memalign posix_memalign getauxval)
206 # Check for broken semaphore implementation on darwin.
207 # sem_init returns: sem_init error: Function not implemented.
210 AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
211 Define if the POSIX Semaphores do not work on your system.)
217 # See if we support thread-local storage.
220 # See what sort of export controls are available.
221 LIBITM_CHECK_ATTRIBUTE_VISIBILITY
222 LIBITM_CHECK_ATTRIBUTE_DLLEXPORT
223 LIBITM_CHECK_ATTRIBUTE_ALIAS
225 # Check linker hardware capability support.
226 GCC_CHECK_LINKER_HWCAP
227 # If defaulting to -mavx, don't clear hwcaps.
228 AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])
230 LIBITM_ENABLE_SYMVERS
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.])
236 # See if we can emit unwind info in the sjlj stub.
239 # Determine the proper ABI type for size_t.
240 LIBITM_CHECK_SIZE_T_MANGLING
242 # Get target configury.
243 . ${srcdir}/configure.tgt
244 if test -n "$UNSUPPORTED"; then
245 AC_MSG_ERROR([Configuration ${target} is unsupported.])
248 CFLAGS="$save_CFLAGS $XCFLAGS"
250 # Check for __sync_val_compare_and_swap, but only after the target has
251 # had a chance to set XCFLAGS.
252 LIBITM_CHECK_SYNC_BUILTINS
253 LIBITM_CHECK_64BIT_SYNC_BUILTINS
258 GCC_CHECK_ELF_STYLE_WEAKREF
261 CFLAGS="$save_CFLAGS"
264 AC_ARG_ENABLE([werror],
265 [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
266 # Add -Wall -Werror if we are using GCC.
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="$XCFLAGS -Werror"])
272 XCFLAGS="$XCFLAGS $XPCFLAGS"
274 # Add CET specific flags if CET is enabled
275 GCC_CET_FLAGS(CET_FLAGS)
276 XCFLAGS="$XCFLAGS $CET_FLAGS"
278 AC_SUBST(config_path)
282 if test ${multilib} = yes; then
283 multilib_arg="--enable-multilib"
288 # Set up the set of libraries that we need to link against for libitm.
289 # Note that the GTM_SELF_SPECS in gcc.c will force -pthread for -fgnu-tm,
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}"
295 link_itm="-litm $LIBS"
299 AM_CONDITIONAL([ARCH_ARM], [test "$ARCH" = arm])
300 AM_CONDITIONAL([ARCH_X86], [test "$ARCH" = x86])
301 AM_CONDITIONAL([ARCH_X86_AVX], [test "$libitm_cv_as_avx" = yes])
302 AM_CONDITIONAL([ARCH_FUTEX], [test $enable_linux_futex = yes])
304 # Determine what GCC version number to use in filesystem paths.
307 AC_CONFIG_FILES(Makefile testsuite/Makefile libitm.spec)