1 # Process this file with autoreconf to produce a configure script.
2 # Copyright (C) 2011-2019 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 # Calculate toolexeclibdir
82 # Also toolexecdir, though it's only used in toolexeclibdir
83 case ${enable_version_specific_runtime_libs} in
85 # Need the gcc compiler version to know where to install libraries
86 # and header files if --enable-version-specific-runtime-libs option
88 toolexecdir='$(libdir)/gcc/$(target_alias)'
89 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
92 if test -n "$with_cross_host" &&
93 test x"$with_cross_host" != x"no"; then
94 # Install a library built with a cross compiler in tooldir, not libdir.
95 toolexecdir='$(exec_prefix)/$(target_alias)'
96 toolexeclibdir='$(toolexecdir)/lib'
98 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
99 toolexeclibdir='$(libdir)'
101 multi_os_directory=`$CC -print-multi-os-directory`
102 case $multi_os_directory in
103 .) ;; # Avoid trailing /.
104 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
108 AC_SUBST(toolexecdir)
109 AC_SUBST(toolexeclibdir)
111 # Check the compiler.
112 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
113 # We must force CC to /not/ be precious variables; otherwise
114 # the wrong, non-multilib-adjusted value will be used in multilibs.
115 # As a side effect, we have to subst CFLAGS ourselves.
117 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
118 m4_define([_AC_ARG_VAR_PRECIOUS],[])
122 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
126 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
127 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
128 # in both places for now and restore CFLAGS at the end of config.
129 save_CFLAGS="$CFLAGS"
131 # Find other programs we need.
132 AC_CHECK_TOOL(AR, ar)
133 AC_CHECK_TOOL(NM, nm)
134 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
135 AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)
139 # See if makeinfo has been installed and is modern enough
140 # that we can use it.
141 ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
142 [GNU texinfo.* \([0-9][0-9.]*\)],
143 [4.[4-9]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])
144 AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")
149 AC_SUBST(enable_shared)
150 AC_SUBST(enable_static)
154 # For libtool versioning info, format is CURRENT:REVISION:AGE
155 libtool_VERSION=1:0:0
156 AC_SUBST(libtool_VERSION)
158 # Check header files.
162 AC_CHECK_HEADERS(unistd.h semaphore.h sys/time.h sys/auxv.h malloc.h)
164 GCC_HEADER_STDINT(gstdint.h)
166 GCC_AC_FUNC_MMAP_BLACKLIST
169 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
171 [#ifndef WORDS_BIGENDIAN
172 #define WORDS_BIGENDIAN 0
175 # Check to see if -pthread or -lpthread is needed. Prefer the former.
176 # In case the pthread.h system header is not found, this test will fail.
178 CFLAGS="$CFLAGS -pthread"
181 [#include <pthread.h>
182 void *g(void *d) { return NULL; }],
183 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
184 [XPCFLAGS=" -Wc,-pthread"],
185 [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
188 [#include <pthread.h>
189 void *g(void *d) { return NULL; }],
190 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
192 [AC_MSG_ERROR([Pthreads are required to build libitm])])])
194 # Check for functions needed.
195 AC_CHECK_FUNCS(strtoull memalign posix_memalign getauxval)
197 # Check for broken semaphore implementation on darwin.
198 # sem_init returns: sem_init error: Function not implemented.
201 AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
202 Define if the POSIX Semaphores do not work on your system.)
208 # See if we support thread-local storage.
211 # See what sort of export controls are available.
212 LIBITM_CHECK_ATTRIBUTE_VISIBILITY
213 LIBITM_CHECK_ATTRIBUTE_DLLEXPORT
214 LIBITM_CHECK_ATTRIBUTE_ALIAS
216 # Check linker hardware capability support.
217 GCC_CHECK_LINKER_HWCAP
218 # If defaulting to -mavx, don't clear hwcaps.
219 AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])
221 LIBITM_ENABLE_SYMVERS
222 if test $enable_symvers = gnu; then
223 AC_DEFINE(LIBITM_GNU_SYMBOL_VERSIONING, 1,
224 [Define to 1 if GNU symbol versioning is used for libitm.])
227 # See if we can emit unwind info in the sjlj stub.
230 # Determine the proper ABI type for size_t.
231 LIBITM_CHECK_SIZE_T_MANGLING
233 # Get target configury.
234 . ${srcdir}/configure.tgt
235 if test -n "$UNSUPPORTED"; then
236 AC_MSG_ERROR([Configuration ${target} is unsupported.])
239 CFLAGS="$save_CFLAGS $XCFLAGS"
241 # Check for __sync_val_compare_and_swap, but only after the target has
242 # had a chance to set XCFLAGS.
243 LIBITM_CHECK_SYNC_BUILTINS
244 LIBITM_CHECK_64BIT_SYNC_BUILTINS
249 GCC_CHECK_ELF_STYLE_WEAKREF
252 CFLAGS="$save_CFLAGS"
255 # Add -Wall -Werror if we are using GCC.
256 if test "x$GCC" = "xyes"; then
257 XCFLAGS="$XCFLAGS -Wall -Werror"
260 XCFLAGS="$XCFLAGS $XPCFLAGS"
262 # Add CET specific flags if CET is enabled
263 GCC_CET_FLAGS(CET_FLAGS)
264 XCFLAGS="$XCFLAGS $CET_FLAGS"
266 AC_SUBST(config_path)
270 if test ${multilib} = yes; then
271 multilib_arg="--enable-multilib"
276 # Set up the set of libraries that we need to link against for libitm.
277 # Note that the GTM_SELF_SPECS in gcc.c will force -pthread for -fgnu-tm,
278 # which will force linkage against -lpthread (or equivalent for the system).
279 # That's not 100% ideal, but about the best we can do easily.
280 if test $enable_shared = yes; then
281 link_itm="-litm %{static: $LIBS}"
283 link_itm="-litm $LIBS"
287 AM_CONDITIONAL([ARCH_ARM], [test "$ARCH" = arm])
288 AM_CONDITIONAL([ARCH_X86], [test "$ARCH" = x86])
289 AM_CONDITIONAL([ARCH_X86_AVX], [test "$libitm_cv_as_avx" = yes])
290 AM_CONDITIONAL([ARCH_FUTEX], [test $enable_linux_futex = yes])
292 # Determine what GCC version number to use in filesystem paths.
295 AC_CONFIG_FILES(Makefile testsuite/Makefile libitm.spec)