1 # Process this file with autoreconf to produce a configure script.
2 # Copyright (C) 2012-2019 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 # Calculate toolexeclibdir
88 # Also toolexecdir, though it's only used in toolexeclibdir
89 case ${enable_version_specific_runtime_libs} in
91 # Need the gcc compiler version to know where to install libraries
92 # and header files if --enable-version-specific-runtime-libs option
94 toolexecdir='$(libdir)/gcc/$(target_alias)'
95 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
98 if test -n "$with_cross_host" &&
99 test x"$with_cross_host" != x"no"; then
100 # Install a library built with a cross compiler in tooldir, not libdir.
101 toolexecdir='$(exec_prefix)/$(target_alias)'
102 toolexeclibdir='$(toolexecdir)/lib'
104 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
105 toolexeclibdir='$(libdir)'
107 multi_os_directory=`$CC -print-multi-os-directory`
108 case $multi_os_directory in
109 .) ;; # Avoid trailing /.
110 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
114 AC_SUBST(toolexecdir)
115 AC_SUBST(toolexeclibdir)
117 # Check the compiler.
118 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
119 # We must force CC to /not/ be precious variables; otherwise
120 # the wrong, non-multilib-adjusted value will be used in multilibs.
121 # As a side effect, we have to subst CFLAGS ourselves.
123 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
124 m4_define([_AC_ARG_VAR_PRECIOUS],[])
127 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
131 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
132 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
133 # in both places for now and restore CFLAGS at the end of config.
134 save_CFLAGS="$CFLAGS"
136 # Find other programs we need.
137 AC_CHECK_TOOL(AR, ar)
138 AC_CHECK_TOOL(NM, nm)
139 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
140 AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)
146 AC_SUBST(enable_shared)
147 AC_SUBST(enable_static)
150 # For libtool versioning info, format is CURRENT:REVISION:AGE
151 libtool_VERSION=3:0:2
152 AC_SUBST(libtool_VERSION)
154 # Check for used threading-model
155 AC_MSG_CHECKING([for thread model used by GCC])
156 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
157 AC_MSG_RESULT([$target_thread_file])
161 ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse])
165 # Get target configury.
166 . ${srcdir}/configure.tgt
167 if test -n "$UNSUPPORTED"; then
168 AC_MSG_ERROR([Configuration ${target} is unsupported.])
171 # Write out the ifunc resolver arg type.
172 AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS,
173 [Define ifunc resolver function argument.])
175 # Disable fallbacks to __sync routines from libgcc. Otherwise we'll
176 # make silly decisions about what the cpu can do.
177 CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS"
179 # Check header files.
182 GCC_HEADER_STDINT(gstdint.h)
183 AC_CHECK_HEADERS([fenv.h])
185 # Check for common type sizes
186 LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE])
188 # Check for compiler builtins of atomic operations.
189 LIBAT_TEST_ATOMIC_INIT
190 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE])
191 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS])
192 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE])
193 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS])
194 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD])
195 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP])
198 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
200 [#ifndef WORDS_BIGENDIAN
201 #define WORDS_BIGENDIAN 0
206 # Check to see if -pthread or -lpthread is needed. Prefer the former.
207 # In case the pthread.h system header is not found, this test will fail.
208 case " $config_path " in
211 CFLAGS="$CFLAGS -pthread"
214 [#include <pthread.h>
215 void *g(void *d) { return NULL; }],
216 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
217 [XPCFLAGS=" -pthread"],
218 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
221 [#include <pthread.h>
222 void *g(void *d) { return NULL; }],
223 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
225 [AC_MSG_ERROR([Pthreads are required to build libatomic])])])
226 CFLAGS="$save_CFLAGS $XPCFLAGS"
230 # See what sort of export controls are available.
231 LIBAT_CHECK_ATTRIBUTE_VISIBILITY
232 LIBAT_CHECK_ATTRIBUTE_DLLEXPORT
233 LIBAT_CHECK_ATTRIBUTE_ALIAS
234 if test x$try_ifunc = xyes; then
238 # Check linker support.
242 CFLAGS="$save_CFLAGS"
245 # Add -Wall -Werror if we are using GCC.
246 if test "x$GCC" = "xyes"; then
247 XCFLAGS="$XCFLAGS -Wall -Werror"
250 # Add CET specific flags if CET is enabled
251 GCC_CET_FLAGS(CET_FLAGS)
252 XCFLAGS="$XCFLAGS $CET_FLAGS"
254 XCFLAGS="$XCFLAGS $XPCFLAGS"
256 AC_SUBST(config_path)
262 AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes)
263 AM_CONDITIONAL(ARCH_AARCH64_LINUX,
264 [expr "$config_path" : ".* linux/aarch64 .*" > /dev/null])
265 AM_CONDITIONAL(ARCH_ARM_LINUX,
266 [expr "$config_path" : ".* linux/arm .*" > /dev/null])
267 AM_CONDITIONAL(ARCH_I386,
268 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4])
269 AM_CONDITIONAL(ARCH_X86_64,
270 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8])
272 # Determine what GCC version number to use in filesystem paths.
275 if test ${multilib} = yes; then
276 multilib_arg="--enable-multilib"
281 AC_CONFIG_FILES(Makefile testsuite/Makefile)