1# Process this file with autoreconf to produce a configure script. 2# Copyright (C) 2012-2020 Free Software Foundation, Inc. 3# 4# This file is part of the GNU Atomic Library (libatomic). 5# 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. 10# 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 14# more details. 15# 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. 19# 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/>. 24 25AC_INIT([GNU Atomic Library], 1.0,,[libatomic]) 26AC_CONFIG_HEADER(auto-config.h) 27 28# ------- 29# Options 30# ------- 31 32AC_MSG_CHECKING([for --enable-version-specific-runtime-libs]) 33LIBAT_ENABLE(version-specific-runtime-libs, no, , 34 [Specify that runtime libraries should be installed in a compiler-specific directory], 35 permit yes|no) 36AC_MSG_RESULT($enable_version_specific_runtime_libs) 37 38# We would like our source tree to be readonly. However when releases or 39# pre-releases are generated, the flex/bison generated files as well as the 40# various formats of manuals need to be included along with the rest of the 41# sources. Therefore we have --enable-generated-files-in-srcdir to do 42# just that. 43AC_MSG_CHECKING([for --enable-generated-files-in-srcdir]) 44LIBAT_ENABLE(generated-files-in-srcdir, no, , 45 [put copies of generated files in source dir intended for creating source 46 tarballs for users without texinfo bison or flex.], 47 permit yes|no) 48AC_MSG_RESULT($enable_generated_files_in_srcdir) 49AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes) 50 51 52# ------- 53 54# Gets build, host, target, *_vendor, *_cpu, *_os, etc. 55# 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/. 58# 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. :-) 63# 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 $with_cross_host. 66# 67# Do not delete or change the following two lines. For why, see 68# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html 69AC_CANONICAL_SYSTEM 70target_alias=${target_alias-$host_alias} 71 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. 84AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override]) 85AM_ENABLE_MULTILIB(, ..) 86 87GCC_WITH_TOOLEXECLIBDIR 88 89# Calculate toolexeclibdir 90# Also toolexecdir, though it's only used in toolexeclibdir 91case ${enable_version_specific_runtime_libs} in 92 yes) 93 # Need the gcc compiler version to know where to install libraries 94 # and header files if --enable-version-specific-runtime-libs option 95 # is selected. 96 toolexecdir='$(libdir)/gcc/$(target_alias)' 97 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)' 98 ;; 99 no) 100 if test -n "$with_cross_host" && 101 test x"$with_cross_host" != x"no"; then 102 # Install a library built with a cross compiler in tooldir, not libdir. 103 toolexecdir='$(exec_prefix)/$(target_alias)' 104 case ${with_toolexeclibdir} in 105 no) 106 toolexeclibdir='$(toolexecdir)/lib' 107 ;; 108 *) 109 toolexeclibdir=${with_toolexeclibdir} 110 ;; 111 esac 112 else 113 toolexecdir='$(libdir)/gcc-lib/$(target_alias)' 114 toolexeclibdir='$(libdir)' 115 fi 116 multi_os_directory=`$CC -print-multi-os-directory` 117 case $multi_os_directory in 118 .) ;; # Avoid trailing /. 119 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;; 120 esac 121 ;; 122esac 123AC_SUBST(toolexecdir) 124AC_SUBST(toolexeclibdir) 125 126# Check the compiler. 127# The same as in boehm-gc and libstdc++. Have to borrow it from there. 128# We must force CC to /not/ be precious variables; otherwise 129# the wrong, non-multilib-adjusted value will be used in multilibs. 130# As a side effect, we have to subst CFLAGS ourselves. 131 132m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS]) 133m4_define([_AC_ARG_VAR_PRECIOUS],[]) 134AC_PROG_CC 135AM_PROG_AS 136m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) 137 138AC_SUBST(CFLAGS) 139 140# In order to override CFLAGS_FOR_TARGET, all of our special flags go 141# in XCFLAGS. But we need them in CFLAGS during configury. So put them 142# in both places for now and restore CFLAGS at the end of config. 143save_CFLAGS="$CFLAGS" 144 145# Find other programs we need. 146AC_CHECK_TOOL(AR, ar) 147AC_CHECK_TOOL(NM, nm) 148AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error) 149AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error) 150AC_PROG_INSTALL 151 152# Configure libtool 153AM_PROG_LIBTOOL 154ACX_LT_HOST_FLAGS 155AC_SUBST(enable_shared) 156AC_SUBST(enable_static) 157AM_MAINTAINER_MODE 158 159# For libtool versioning info, format is CURRENT:REVISION:AGE 160libtool_VERSION=3:0:2 161AC_SUBST(libtool_VERSION) 162 163# Check for used threading-model 164AC_MSG_CHECKING([for thread model used by GCC]) 165target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'` 166AC_MSG_RESULT([$target_thread_file]) 167 168case "$target" in 169 *aarch64*) 170 ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse]) 171 ;; 172esac 173 174# Get target configury. 175. ${srcdir}/configure.tgt 176if test -n "$UNSUPPORTED"; then 177 AC_MSG_ERROR([Configuration ${target} is unsupported.]) 178fi 179 180# Write out the ifunc resolver arg type. 181AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS, 182 [Define ifunc resolver function argument.]) 183 184# Disable fallbacks to __sync routines from libgcc. Otherwise we'll 185# make silly decisions about what the cpu can do. 186CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS" 187 188# Check header files. 189AC_STDC_HEADERS 190ACX_HEADER_STRING 191GCC_HEADER_STDINT(gstdint.h) 192AC_CHECK_HEADERS([fenv.h]) 193 194# Check for common type sizes 195LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE]) 196 197# Check for compiler builtins of atomic operations. 198LIBAT_TEST_ATOMIC_INIT 199LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE]) 200LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS]) 201LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE]) 202LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS]) 203LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD]) 204LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP]) 205 206AC_C_BIGENDIAN 207# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE. 208AH_BOTTOM( 209[#ifndef WORDS_BIGENDIAN 210#define WORDS_BIGENDIAN 0 211#endif]) 212 213LIBAT_WORDSIZE 214 215# Check to see if -pthread or -lpthread is needed. Prefer the former. 216# In case the pthread.h system header is not found, this test will fail. 217case " $config_path " in 218 *" posix "*) 219 XPCFLAGS="" 220 CFLAGS="$CFLAGS -pthread" 221 AC_LINK_IFELSE( 222 [AC_LANG_PROGRAM( 223 [#include <pthread.h> 224 void *g(void *d) { return NULL; }], 225 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], 226 [XPCFLAGS=" -pthread"], 227 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS" 228 AC_LINK_IFELSE( 229 [AC_LANG_PROGRAM( 230 [#include <pthread.h> 231 void *g(void *d) { return NULL; }], 232 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], 233 [], 234 [AC_MSG_ERROR([Pthreads are required to build libatomic])])]) 235 CFLAGS="$save_CFLAGS $XPCFLAGS" 236 ;; 237esac 238 239# See what sort of export controls are available. 240LIBAT_CHECK_ATTRIBUTE_VISIBILITY 241LIBAT_CHECK_ATTRIBUTE_DLLEXPORT 242LIBAT_CHECK_ATTRIBUTE_ALIAS 243if test x$try_ifunc = xyes; then 244 LIBAT_CHECK_IFUNC 245fi 246 247# Check linker support. 248LIBAT_ENABLE_SYMVERS 249 250# Cleanup and exit. 251CFLAGS="$save_CFLAGS" 252AC_CACHE_SAVE 253 254# Add -Wall -Werror if we are using GCC. 255if test "x$GCC" = "xyes"; then 256 XCFLAGS="$XCFLAGS -Wall -Werror" 257fi 258 259# Add CET specific flags if CET is enabled 260GCC_CET_FLAGS(CET_FLAGS) 261XCFLAGS="$XCFLAGS $CET_FLAGS" 262 263XCFLAGS="$XCFLAGS $XPCFLAGS" 264 265AC_SUBST(config_path) 266AC_SUBST(XCFLAGS) 267AC_SUBST(XLDFLAGS) 268AC_SUBST(LIBS) 269AC_SUBST(SIZES) 270 271AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes) 272AM_CONDITIONAL(ARCH_AARCH64_LINUX, 273 [expr "$config_path" : ".* linux/aarch64 .*" > /dev/null]) 274AM_CONDITIONAL(ARCH_ARM_LINUX, 275 [expr "$config_path" : ".* linux/arm .*" > /dev/null]) 276AM_CONDITIONAL(ARCH_I386, 277 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4]) 278AM_CONDITIONAL(ARCH_X86_64, 279 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8]) 280 281# Determine what GCC version number to use in filesystem paths. 282GCC_BASE_VER 283 284if test ${multilib} = yes; then 285 multilib_arg="--enable-multilib" 286else 287 multilib_arg= 288fi 289 290AC_CONFIG_FILES(Makefile testsuite/Makefile) 291AC_CONFIG_FILES(testsuite/libatomic-site-extra.exp) 292AC_OUTPUT 293