libatomic/configure.ac - gcc - Git at Google

 # Process this file with autoreconf to produce a configure script.
 #  Copyright (C) 2012-2018 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])

 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 <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$libat_cv_have_ifunc = xyes)
 AM_CONDITIONAL(ARCH_AARCH64_LINUX,
 	       [expr "$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
	# Process this file with autoreconf to produce a configure script.
	# Copyright (C) 2012-2018 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])

	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 <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$libat_cv_have_ifunc = xyes)
	AM_CONDITIONAL(ARCH_AARCH64_LINUX,
	[expr "$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