# Process this file with autoreconf to produce a configure script.
# Copyright (C) 2012-2019 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
# .
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])
case "$target" in
*aarch64*)
ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse])
;;
esac
# Get target configury.
. ${srcdir}/configure.tgt
if test -n "$UNSUPPORTED"; then
AC_MSG_ERROR([Configuration ${target} is unsupported.])
fi
# Write out the ifunc resolver arg type.
AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS,
[Define ifunc resolver function argument.])
# Disable fallbacks to __sync routines from libgcc. Otherwise we'll
# make silly decisions about what the cpu can do.
CFLAGS="$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
void *g(void *d) { return NULL; }],
[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
[XPCFLAGS=" -pthread"],
[CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[#include
void *g(void *d) { return NULL; }],
[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
[],
[AC_MSG_ERROR([Pthreads are required to build libatomic])])])
CFLAGS="$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_AARCH64_LINUX,
[expr "$config_path" : ".* linux/aarch64 .*" > /dev/null])
AM_CONDITIONAL(ARCH_ARM_LINUX,
[expr "$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