1 # Process this file with autoreconf to produce a configure script.
2 # Copyright (C) 2012-2023 Free Software Foundation, Inc.
4 # This file is part of the GNU Atomic Library (libatomic).
6 # Libatomic is free software; you can redistribute it and/or modify it
7 # under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 3 of the License, or
9 # (at your option) any later version.
11 # Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
12 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 # Under Section 7 of GPL version 3, you are granted additional
17 # permissions described in the GCC Runtime Library Exception, version
18 # 3.1, as published by the Free Software Foundation.
20 # You should have received a copy of the GNU General Public License and
21 # a copy of the GCC Runtime Library Exception along with this program;
22 # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 # <http://www.gnu.org/licenses/>.
25 AC_INIT([GNU Atomic Library], 1.0,,[libatomic])
26 AC_CONFIG_HEADER(auto-config.h)
32 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
33 LIBAT_ENABLE(version-specific-runtime-libs, no, ,
34 [Specify that runtime libraries should be installed in a compiler-specific directory],
36 AC_MSG_RESULT($enable_version_specific_runtime_libs)
38 # We would like our source tree to be readonly. However when releases or
39 # pre-releases are generated, the flex/bison generated files as well as the
40 # various formats of manuals need to be included along with the rest of the
41 # sources. Therefore we have --enable-generated-files-in-srcdir to do
43 AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
44 LIBAT_ENABLE(generated-files-in-srcdir, no, ,
45 [put copies of generated files in source dir intended for creating source
46 tarballs for users without texinfo bison or flex.],
48 AC_MSG_RESULT($enable_generated_files_in_srcdir)
49 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
54 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
56 # You will slowly go insane if you do not grok the following fact: when
57 # building this library, the top-level /target/ becomes the library's /host/.
59 # configure then causes --target to default to --host, exactly like any
60 # other package using autoconf. Therefore, 'target' and 'host' will
61 # always be the same. This makes sense both for native and cross compilers
62 # just think about it for a little while. :-)
64 # Also, if this library is being configured as part of a cross compiler, the
65 # top-level configure script will pass the "real" host as $with_cross_host.
67 # Do not delete or change the following two lines. For why, see
68 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
70 target_alias=${target_alias-$host_alias}
72 # Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
73 # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
74 # 1.9.0: minimum required version
75 # no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
76 # of other PACKAGE_* variables will, however, and there's nothing
77 # we can do about that; they come from AC_INIT).
78 # no-dist: we don't want 'dist' and related rules.
79 # foreign: we don't follow the normal rules for GNU packages (no COPYING
80 # file in the top srcdir, etc, etc), so stop complaining.
81 # -Wall: turns on all automake warnings...
82 # -Wno-portability: ...except this one, since GNU make is required.
83 # -Wno-override: ... and this one, since we do want this in testsuite.
84 AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
85 AM_ENABLE_MULTILIB(, ..)
87 GCC_WITH_TOOLEXECLIBDIR
89 # Calculate toolexeclibdir
90 # Also toolexecdir, though it's only used in toolexeclibdir
91 case ${enable_version_specific_runtime_libs} in
93 # Need the gcc compiler version to know where to install libraries
94 # and header files if --enable-version-specific-runtime-libs option
96 toolexecdir='$(libdir)/gcc/$(target_alias)'
97 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
100 if test -n "$with_cross_host" &&
101 test x"$with_cross_host" != x"no"; then
102 # Install a library built with a cross compiler in tooldir, not libdir.
103 toolexecdir='$(exec_prefix)/$(target_alias)'
104 case ${with_toolexeclibdir} in
106 toolexeclibdir='$(toolexecdir)/lib'
109 toolexeclibdir=${with_toolexeclibdir}
113 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
114 toolexeclibdir='$(libdir)'
116 multi_os_directory=`$CC -print-multi-os-directory`
117 case $multi_os_directory in
118 .) ;; # Avoid trailing /.
119 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
123 AC_SUBST(toolexecdir)
124 AC_SUBST(toolexeclibdir)
126 # Check the compiler.
127 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
128 # We must force CC to /not/ be precious variables; otherwise
129 # the wrong, non-multilib-adjusted value will be used in multilibs.
130 # As a side effect, we have to subst CFLAGS ourselves.
132 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
133 m4_define([_AC_ARG_VAR_PRECIOUS],[])
136 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
140 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
141 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
142 # in both places for now and restore CFLAGS at the end of config.
143 save_CFLAGS="$CFLAGS"
145 # Find other programs we need.
146 AC_CHECK_TOOL(AR, ar)
147 AC_CHECK_TOOL(NM, nm)
148 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
154 AC_SUBST(enable_shared)
155 AC_SUBST(enable_static)
158 # For libtool versioning info, format is CURRENT:REVISION:AGE
159 libtool_VERSION=3:0:2
160 AC_SUBST(libtool_VERSION)
162 # Check for used threading-model
163 AC_MSG_CHECKING([for thread model used by GCC])
164 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
165 AC_MSG_RESULT([$target_thread_file])
169 ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse])
173 # Get target configury.
174 . ${srcdir}/configure.tgt
175 if test -n "$UNSUPPORTED"; then
176 AC_MSG_ERROR([Configuration ${target} is unsupported.])
179 # Write out the ifunc resolver arg type.
180 AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS,
181 [Define ifunc resolver function argument.])
183 # Disable fallbacks to __sync routines from libgcc. Otherwise we'll
184 # make silly decisions about what the cpu can do.
185 CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS"
187 # Check header files.
190 GCC_HEADER_STDINT(gstdint.h)
191 AC_CHECK_HEADERS([fenv.h])
193 # Check for common type sizes
194 LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE])
196 # Check for compiler builtins of atomic operations.
197 LIBAT_TEST_ATOMIC_INIT
198 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE])
199 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS])
200 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE])
201 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS])
202 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD])
203 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP])
206 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
208 [#ifndef WORDS_BIGENDIAN
209 #define WORDS_BIGENDIAN 0
214 # Check to see if -pthread or -lpthread is needed. Prefer the former.
215 # In case the pthread.h system header is not found, this test will fail.
216 case " $config_path " in
219 CFLAGS="$CFLAGS -pthread"
222 [#include <pthread.h>
223 void *g(void *d) { return NULL; }],
224 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
225 [XPCFLAGS=" -pthread"],
226 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
229 [#include <pthread.h>
230 void *g(void *d) { return NULL; }],
231 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
233 [AC_MSG_ERROR([Pthreads are required to build libatomic])])])
234 CFLAGS="$save_CFLAGS $XPCFLAGS"
238 # See what sort of export controls are available.
239 LIBAT_CHECK_ATTRIBUTE_VISIBILITY
240 LIBAT_CHECK_ATTRIBUTE_DLLEXPORT
241 LIBAT_CHECK_ATTRIBUTE_ALIAS
242 if test x$try_ifunc = xyes; then
246 # Check linker support.
250 CFLAGS="$save_CFLAGS"
253 AC_ARG_ENABLE([werror],
254 [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
255 # Add -Wall -Werror if we are using GCC.
256 AS_IF([test "x$GCC" = "xyes"],
257 [XCFLAGS="$XCFLAGS -Wall"])
258 AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
259 [XCFLAGS="$XCFLAGS -Werror"])
261 # Add CET specific flags if CET is enabled
262 GCC_CET_FLAGS(CET_FLAGS)
263 XCFLAGS="$XCFLAGS $CET_FLAGS"
265 XCFLAGS="$XCFLAGS $XPCFLAGS"
267 AC_SUBST(config_path)
273 # Conditionalize the makefile for this target machine.
275 for f in ${tmake_file}
277 if test -f ${srcdir}/config/$f
279 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
282 tmake_file="${tmake_file_}"
286 AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes)
287 AM_CONDITIONAL(ARCH_AARCH64_LINUX,
288 [expr "$config_path" : ".* linux/aarch64 .*" > /dev/null])
289 AM_CONDITIONAL(ARCH_ARM_LINUX,
290 [expr "$config_path" : ".* linux/arm .*" > /dev/null])
291 AM_CONDITIONAL(ARCH_I386,
292 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4])
293 AM_CONDITIONAL(ARCH_X86_64,
294 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8])
296 # Determine what GCC version number to use in filesystem paths.
299 if test ${multilib} = yes; then
300 multilib_arg="--enable-multilib"
305 AC_CONFIG_FILES(Makefile testsuite/Makefile)
306 AC_CONFIG_FILES(testsuite/libatomic-site-extra.exp)