1 # Process this file with autoreconf to produce a configure script.
2 # Copyright (C) 2012-2017 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/>.
26 AC_INIT([GNU Atomic Library], 1.0,,[libatomic])
27 AC_CONFIG_HEADER(auto-config.h)
33 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
34 LIBAT_ENABLE(version-specific-runtime-libs, no, ,
35 [Specify that runtime libraries should be installed in a compiler-specific directory],
37 AC_MSG_RESULT($enable_version_specific_runtime_libs)
39 # We would like our source tree to be readonly. However when releases or
40 # pre-releases are generated, the flex/bison generated files as well as the
41 # various formats of manuals need to be included along with the rest of the
42 # sources. Therefore we have --enable-generated-files-in-srcdir to do
44 AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
45 LIBAT_ENABLE(generated-files-in-srcdir, no, ,
46 [put copies of generated files in source dir intended for creating source
47 tarballs for users without texinfo bison or flex.],
49 AC_MSG_RESULT($enable_generated_files_in_srcdir)
50 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
55 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
57 # You will slowly go insane if you do not grok the following fact: when
58 # building this library, the top-level /target/ becomes the library's /host/.
60 # configure then causes --target to default to --host, exactly like any
61 # other package using autoconf. Therefore, 'target' and 'host' will
62 # always be the same. This makes sense both for native and cross compilers
63 # just think about it for a little while. :-)
65 # Also, if this library is being configured as part of a cross compiler, the
66 # top-level configure script will pass the "real" host as $with_cross_host.
68 # Do not delete or change the following two lines. For why, see
69 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
71 target_alias=${target_alias-$host_alias}
73 # Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
74 # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
75 # 1.9.0: minimum required version
76 # no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
77 # of other PACKAGE_* variables will, however, and there's nothing
78 # we can do about that; they come from AC_INIT).
79 # no-dist: we don't want 'dist' and related rules.
80 # foreign: we don't follow the normal rules for GNU packages (no COPYING
81 # file in the top srcdir, etc, etc), so stop complaining.
82 # -Wall: turns on all automake warnings...
83 # -Wno-portability: ...except this one, since GNU make is required.
84 # -Wno-override: ... and this one, since we do want this in testsuite.
85 AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
86 AM_ENABLE_MULTILIB(, ..)
88 # Calculate toolexeclibdir
89 # Also toolexecdir, though it's only used in toolexeclibdir
90 case ${enable_version_specific_runtime_libs} in
92 # Need the gcc compiler version to know where to install libraries
93 # and header files if --enable-version-specific-runtime-libs option
95 toolexecdir='$(libdir)/gcc/$(target_alias)'
96 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
99 if test -n "$with_cross_host" &&
100 test x"$with_cross_host" != x"no"; then
101 # Install a library built with a cross compiler in tooldir, not libdir.
102 toolexecdir='$(exec_prefix)/$(target_alias)'
103 toolexeclibdir='$(toolexecdir)/lib'
105 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
106 toolexeclibdir='$(libdir)'
108 multi_os_directory=`$CC -print-multi-os-directory`
109 case $multi_os_directory in
110 .) ;; # Avoid trailing /.
111 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
115 AC_SUBST(toolexecdir)
116 AC_SUBST(toolexeclibdir)
118 # Check the compiler.
119 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
120 # We must force CC to /not/ be precious variables; otherwise
121 # the wrong, non-multilib-adjusted value will be used in multilibs.
122 # As a side effect, we have to subst CFLAGS ourselves.
124 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
125 m4_define([_AC_ARG_VAR_PRECIOUS],[])
128 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
132 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
133 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
134 # in both places for now and restore CFLAGS at the end of config.
135 save_CFLAGS="$CFLAGS"
137 # Find other programs we need.
138 AC_CHECK_TOOL(AR, ar)
139 AC_CHECK_TOOL(NM, nm)
140 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
141 AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)
147 AC_SUBST(enable_shared)
148 AC_SUBST(enable_static)
151 # For libtool versioning info, format is CURRENT:REVISION:AGE
152 libtool_VERSION=3:0:2
153 AC_SUBST(libtool_VERSION)
155 # Check for used threading-model
156 AC_MSG_CHECKING([for thread model used by GCC])
157 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
158 AC_MSG_RESULT([$target_thread_file])
160 # Get target configury.
161 . ${srcdir}/configure.tgt
162 if test -n "$UNSUPPORTED"; then
163 AC_MSG_ERROR([Configuration ${target} is unsupported.])
166 # Disable fallbacks to __sync routines from libgcc. Otherwise we'll
167 # make silly decisions about what the cpu can do.
168 CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS"
170 # Check header files.
173 GCC_HEADER_STDINT(gstdint.h)
174 AC_CHECK_HEADERS([fenv.h])
176 # Check for common type sizes
177 LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE])
179 # Check for compiler builtins of atomic operations.
180 LIBAT_TEST_ATOMIC_INIT
181 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE])
182 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS])
183 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE])
184 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS])
185 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD])
186 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP])
189 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
191 [#ifndef WORDS_BIGENDIAN
192 #define WORDS_BIGENDIAN 0
197 # Check to see if -pthread or -lpthread is needed. Prefer the former.
198 # In case the pthread.h system header is not found, this test will fail.
199 case " $config_path " in
202 CFLAGS="$CFLAGS -pthread"
205 [#include <pthread.h>
206 void *g(void *d) { return NULL; }],
207 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
208 [XPCFLAGS=" -pthread"],
209 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
212 [#include <pthread.h>
213 void *g(void *d) { return NULL; }],
214 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
216 [AC_MSG_ERROR([Pthreads are required to build libatomic])])])
217 CFLAGS="$save_CFLAGS $XPCFLAGS"
221 # See what sort of export controls are available.
222 LIBAT_CHECK_ATTRIBUTE_VISIBILITY
223 LIBAT_CHECK_ATTRIBUTE_DLLEXPORT
224 LIBAT_CHECK_ATTRIBUTE_ALIAS
225 if test x$try_ifunc = xyes; then
229 # Check linker support.
233 CFLAGS="$save_CFLAGS"
236 # Add -Wall -Werror if we are using GCC.
237 if test "x$GCC" = "xyes"; then
238 XCFLAGS="$XCFLAGS -Wall -Werror"
241 XCFLAGS="$XCFLAGS $XPCFLAGS"
243 AC_SUBST(config_path)
249 AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes)
250 AM_CONDITIONAL(ARCH_ARM_LINUX,
251 [expr "$config_path" : ".* linux/arm .*" > /dev/null])
252 AM_CONDITIONAL(ARCH_I386,
253 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4])
254 AM_CONDITIONAL(ARCH_X86_64,
255 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8])
257 if test ${multilib} = yes; then
258 multilib_arg="--enable-multilib"
263 AC_CONFIG_FILES(Makefile testsuite/Makefile)