| # Process this file with autoreconf to produce a configure script. |
| # Copyright (C) 2012-2017 Free Software Foundation, Inc. |
| # |
| # This file is part of the GNU Atomic Library (libatomic). |
| # |
| # Libatomic is free software; you can redistribute it and/or modify it |
| # under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 3 of the License, or |
| # (at your option) any later version. |
| # |
| # Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY |
| # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| # FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| # more details. |
| # |
| # Under Section 7 of GPL version 3, you are granted additional |
| # permissions described in the GCC Runtime Library Exception, version |
| # 3.1, as published by the Free Software Foundation. |
| # |
| # You should have received a copy of the GNU General Public License and |
| # a copy of the GCC Runtime Library Exception along with this program; |
| # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| # <http://www.gnu.org/licenses/>. |
| |
| AC_PREREQ(2.59) |
| AC_INIT([GNU Atomic Library], 1.0,,[libatomic]) |
| AC_CONFIG_HEADER(auto-config.h) |
| |
| # ------- |
| # Options |
| # ------- |
| |
| AC_MSG_CHECKING([for --enable-version-specific-runtime-libs]) |
| LIBAT_ENABLE(version-specific-runtime-libs, no, , |
| [Specify that runtime libraries should be installed in a compiler-specific directory], |
| permit yes|no) |
| AC_MSG_RESULT($enable_version_specific_runtime_libs) |
| |
| # We would like our source tree to be readonly. However when releases or |
| # pre-releases are generated, the flex/bison generated files as well as the |
| # various formats of manuals need to be included along with the rest of the |
| # sources. Therefore we have --enable-generated-files-in-srcdir to do |
| # just that. |
| AC_MSG_CHECKING([for --enable-generated-files-in-srcdir]) |
| LIBAT_ENABLE(generated-files-in-srcdir, no, , |
| [put copies of generated files in source dir intended for creating source |
| tarballs for users without texinfo bison or flex.], |
| permit yes|no) |
| AC_MSG_RESULT($enable_generated_files_in_srcdir) |
| AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes) |
| |
| |
| # ------- |
| |
| # Gets build, host, target, *_vendor, *_cpu, *_os, etc. |
| # |
| # You will slowly go insane if you do not grok the following fact: when |
| # building this library, the top-level /target/ becomes the library's /host/. |
| # |
| # configure then causes --target to default to --host, exactly like any |
| # other package using autoconf. Therefore, 'target' and 'host' will |
| # always be the same. This makes sense both for native and cross compilers |
| # just think about it for a little while. :-) |
| # |
| # Also, if this library is being configured as part of a cross compiler, the |
| # top-level configure script will pass the "real" host as $with_cross_host. |
| # |
| # Do not delete or change the following two lines. For why, see |
| # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html |
| AC_CANONICAL_SYSTEM |
| target_alias=${target_alias-$host_alias} |
| |
| # Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the |
| # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am. |
| # 1.9.0: minimum required version |
| # no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch |
| # of other PACKAGE_* variables will, however, and there's nothing |
| # we can do about that; they come from AC_INIT). |
| # no-dist: we don't want 'dist' and related rules. |
| # foreign: we don't follow the normal rules for GNU packages (no COPYING |
| # file in the top srcdir, etc, etc), so stop complaining. |
| # -Wall: turns on all automake warnings... |
| # -Wno-portability: ...except this one, since GNU make is required. |
| # -Wno-override: ... and this one, since we do want this in testsuite. |
| AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override]) |
| AM_ENABLE_MULTILIB(, ..) |
| |
| # Calculate toolexeclibdir |
| # Also toolexecdir, though it's only used in toolexeclibdir |
| case ${enable_version_specific_runtime_libs} in |
| yes) |
| # Need the gcc compiler version to know where to install libraries |
| # and header files if --enable-version-specific-runtime-libs option |
| # is selected. |
| toolexecdir='$(libdir)/gcc/$(target_alias)' |
| toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)' |
| ;; |
| no) |
| if test -n "$with_cross_host" && |
| test x"$with_cross_host" != x"no"; then |
| # Install a library built with a cross compiler in tooldir, not libdir. |
| toolexecdir='$(exec_prefix)/$(target_alias)' |
| toolexeclibdir='$(toolexecdir)/lib' |
| else |
| toolexecdir='$(libdir)/gcc-lib/$(target_alias)' |
| toolexeclibdir='$(libdir)' |
| fi |
| multi_os_directory=`$CC -print-multi-os-directory` |
| case $multi_os_directory in |
| .) ;; # Avoid trailing /. |
| *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;; |
| esac |
| ;; |
| esac |
| AC_SUBST(toolexecdir) |
| AC_SUBST(toolexeclibdir) |
| |
| # Check the compiler. |
| # The same as in boehm-gc and libstdc++. Have to borrow it from there. |
| # We must force CC to /not/ be precious variables; otherwise |
| # the wrong, non-multilib-adjusted value will be used in multilibs. |
| # As a side effect, we have to subst CFLAGS ourselves. |
| |
| m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS]) |
| m4_define([_AC_ARG_VAR_PRECIOUS],[]) |
| AC_PROG_CC |
| AM_PROG_AS |
| m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) |
| |
| AC_SUBST(CFLAGS) |
| |
| # In order to override CFLAGS_FOR_TARGET, all of our special flags go |
| # in XCFLAGS. But we need them in CFLAGS during configury. So put them |
| # in both places for now and restore CFLAGS at the end of config. |
| save_CFLAGS="$CFLAGS" |
| |
| # Find other programs we need. |
| AC_CHECK_TOOL(AR, ar) |
| AC_CHECK_TOOL(NM, nm) |
| AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error) |
| AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error) |
| AC_PROG_INSTALL |
| |
| # Configure libtool |
| AM_PROG_LIBTOOL |
| ACX_LT_HOST_FLAGS |
| AC_SUBST(enable_shared) |
| AC_SUBST(enable_static) |
| AM_MAINTAINER_MODE |
| |
| # For libtool versioning info, format is CURRENT:REVISION:AGE |
| libtool_VERSION=3:0:2 |
| AC_SUBST(libtool_VERSION) |
| |
| # Check for used threading-model |
| AC_MSG_CHECKING([for thread model used by GCC]) |
| target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'` |
| AC_MSG_RESULT([$target_thread_file]) |
| |
| # Get target configury. |
| . ${srcdir}/configure.tgt |
| if test -n "$UNSUPPORTED"; then |
| AC_MSG_ERROR([Configuration ${target} is unsupported.]) |
| fi |
| |
| # Disable fallbacks to __sync routines from libgcc. Otherwise we'll |
| # make silly decisions about what the cpu can do. |
| CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS" |
| |
| # Check header files. |
| AC_STDC_HEADERS |
| ACX_HEADER_STRING |
| GCC_HEADER_STDINT(gstdint.h) |
| AC_CHECK_HEADERS([fenv.h]) |
| |
| # Check for common type sizes |
| LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE]) |
| |
| # Check for compiler builtins of atomic operations. |
| LIBAT_TEST_ATOMIC_INIT |
| LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE]) |
| LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS]) |
| LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE]) |
| LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS]) |
| LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD]) |
| LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP]) |
| |
| AC_C_BIGENDIAN |
| # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE. |
| AH_BOTTOM( |
| [#ifndef WORDS_BIGENDIAN |
| #define WORDS_BIGENDIAN 0 |
| #endif]) |
| |
| LIBAT_WORDSIZE |
| |
| # Check to see if -pthread or -lpthread is needed. Prefer the former. |
| # In case the pthread.h system header is not found, this test will fail. |
| case " $config_path " in |
| *" posix "*) |
| XPCFLAGS="" |
| CFLAGS="$CFLAGS -pthread" |
| AC_LINK_IFELSE( |
| [AC_LANG_PROGRAM( |
| [#include <pthread.h> |
| void *g(void *d) { return NULL; }], |
| [pthread_t t; pthread_create(&t,NULL,g,NULL);])], |
| [XPCFLAGS=" -pthread"], |
| [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS" |
| AC_LINK_IFELSE( |
| [AC_LANG_PROGRAM( |
| [#include <pthread.h> |
| void *g(void *d) { return NULL; }], |
| [pthread_t t; pthread_create(&t,NULL,g,NULL);])], |
| [], |
| [AC_MSG_ERROR([Pthreads are required to build libatomic])])]) |
| CFLAGS="$save_CFLAGS $XPCFLAGS" |
| ;; |
| esac |
| |
| # See what sort of export controls are available. |
| LIBAT_CHECK_ATTRIBUTE_VISIBILITY |
| LIBAT_CHECK_ATTRIBUTE_DLLEXPORT |
| LIBAT_CHECK_ATTRIBUTE_ALIAS |
| if test x$try_ifunc = xyes; then |
| LIBAT_CHECK_IFUNC |
| fi |
| |
| # Check linker support. |
| LIBAT_ENABLE_SYMVERS |
| |
| # Cleanup and exit. |
| CFLAGS="$save_CFLAGS" |
| AC_CACHE_SAVE |
| |
| # Add -Wall -Werror if we are using GCC. |
| if test "x$GCC" = "xyes"; then |
| XCFLAGS="$XCFLAGS -Wall -Werror" |
| fi |
| |
| # Add CET specific flags if CET is enabled |
| GCC_CET_FLAGS(CET_FLAGS) |
| XCFLAGS="$XCFLAGS $CET_FLAGS" |
| |
| XCFLAGS="$XCFLAGS $XPCFLAGS" |
| |
| AC_SUBST(config_path) |
| AC_SUBST(XCFLAGS) |
| AC_SUBST(XLDFLAGS) |
| AC_SUBST(LIBS) |
| AC_SUBST(SIZES) |
| |
| AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes) |
| AM_CONDITIONAL(ARCH_ARM_LINUX, |
| [expr "$config_path" : ".* linux/arm .*" > /dev/null]) |
| AM_CONDITIONAL(ARCH_I386, |
| [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4]) |
| AM_CONDITIONAL(ARCH_X86_64, |
| [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8]) |
| |
| # Determine what GCC version number to use in filesystem paths. |
| GCC_BASE_VER |
| |
| if test ${multilib} = yes; then |
| multilib_arg="--enable-multilib" |
| else |
| multilib_arg= |
| fi |
| |
| AC_CONFIG_FILES(Makefile testsuite/Makefile) |
| AC_OUTPUT |