1# Process this file with autoreconf to produce a configure script. 2# Copyright (C) 2012-2019 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 87# Calculate toolexeclibdir 88# Also toolexecdir, though it's only used in toolexeclibdir 89case ${enable_version_specific_runtime_libs} in 90 yes) 91 # Need the gcc compiler version to know where to install libraries 92 # and header files if --enable-version-specific-runtime-libs option 93 # is selected. 94 toolexecdir='$(libdir)/gcc/$(target_alias)' 95 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)' 96 ;; 97 no) 98 if test -n "$with_cross_host" && 99 test x"$with_cross_host" != x"no"; then 100 # Install a library built with a cross compiler in tooldir, not libdir. 101 toolexecdir='$(exec_prefix)/$(target_alias)' 102 toolexeclibdir='$(toolexecdir)/lib' 103 else 104 toolexecdir='$(libdir)/gcc-lib/$(target_alias)' 105 toolexeclibdir='$(libdir)' 106 fi 107 multi_os_directory=`$CC -print-multi-os-directory` 108 case $multi_os_directory in 109 .) ;; # Avoid trailing /. 110 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;; 111 esac 112 ;; 113esac 114AC_SUBST(toolexecdir) 115AC_SUBST(toolexeclibdir) 116 117# Check the compiler. 118# The same as in boehm-gc and libstdc++. Have to borrow it from there. 119# We must force CC to /not/ be precious variables; otherwise 120# the wrong, non-multilib-adjusted value will be used in multilibs. 121# As a side effect, we have to subst CFLAGS ourselves. 122 123m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS]) 124m4_define([_AC_ARG_VAR_PRECIOUS],[]) 125AC_PROG_CC 126AM_PROG_AS 127m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) 128 129AC_SUBST(CFLAGS) 130 131# In order to override CFLAGS_FOR_TARGET, all of our special flags go 132# in XCFLAGS. But we need them in CFLAGS during configury. So put them 133# in both places for now and restore CFLAGS at the end of config. 134save_CFLAGS="$CFLAGS" 135 136# Find other programs we need. 137AC_CHECK_TOOL(AR, ar) 138AC_CHECK_TOOL(NM, nm) 139AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error) 140AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error) 141AC_PROG_INSTALL 142 143# Configure libtool 144AM_PROG_LIBTOOL 145ACX_LT_HOST_FLAGS 146AC_SUBST(enable_shared) 147AC_SUBST(enable_static) 148AM_MAINTAINER_MODE 149 150# For libtool versioning info, format is CURRENT:REVISION:AGE 151libtool_VERSION=3:0:2 152AC_SUBST(libtool_VERSION) 153 154# Check for used threading-model 155AC_MSG_CHECKING([for thread model used by GCC]) 156target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'` 157AC_MSG_RESULT([$target_thread_file]) 158 159case "$target" in 160 *aarch64*) 161 ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse]) 162 ;; 163esac 164 165# Get target configury. 166. ${srcdir}/configure.tgt 167if test -n "$UNSUPPORTED"; then 168 AC_MSG_ERROR([Configuration ${target} is unsupported.]) 169fi 170 171# Write out the ifunc resolver arg type. 172AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS, 173 [Define ifunc resolver function argument.]) 174 175# Disable fallbacks to __sync routines from libgcc. Otherwise we'll 176# make silly decisions about what the cpu can do. 177CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS" 178 179# Check header files. 180AC_STDC_HEADERS 181ACX_HEADER_STRING 182GCC_HEADER_STDINT(gstdint.h) 183AC_CHECK_HEADERS([fenv.h]) 184 185# Check for common type sizes 186LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE]) 187 188# Check for compiler builtins of atomic operations. 189LIBAT_TEST_ATOMIC_INIT 190LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE]) 191LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS]) 192LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE]) 193LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS]) 194LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD]) 195LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP]) 196 197AC_C_BIGENDIAN 198# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE. 199AH_BOTTOM( 200[#ifndef WORDS_BIGENDIAN 201#define WORDS_BIGENDIAN 0 202#endif]) 203 204LIBAT_WORDSIZE 205 206# Check to see if -pthread or -lpthread is needed. Prefer the former. 207# In case the pthread.h system header is not found, this test will fail. 208case " $config_path " in 209 *" posix "*) 210 XPCFLAGS="" 211 CFLAGS="$CFLAGS -pthread" 212 AC_LINK_IFELSE( 213 [AC_LANG_PROGRAM( 214 [#include <pthread.h> 215 void *g(void *d) { return NULL; }], 216 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], 217 [XPCFLAGS=" -pthread"], 218 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS" 219 AC_LINK_IFELSE( 220 [AC_LANG_PROGRAM( 221 [#include <pthread.h> 222 void *g(void *d) { return NULL; }], 223 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], 224 [], 225 [AC_MSG_ERROR([Pthreads are required to build libatomic])])]) 226 CFLAGS="$save_CFLAGS $XPCFLAGS" 227 ;; 228esac 229 230# See what sort of export controls are available. 231LIBAT_CHECK_ATTRIBUTE_VISIBILITY 232LIBAT_CHECK_ATTRIBUTE_DLLEXPORT 233LIBAT_CHECK_ATTRIBUTE_ALIAS 234if test x$try_ifunc = xyes; then 235 LIBAT_CHECK_IFUNC 236fi 237 238# Check linker support. 239LIBAT_ENABLE_SYMVERS 240 241# Cleanup and exit. 242CFLAGS="$save_CFLAGS" 243AC_CACHE_SAVE 244 245# Add -Wall -Werror if we are using GCC. 246if test "x$GCC" = "xyes"; then 247 XCFLAGS="$XCFLAGS -Wall -Werror" 248fi 249 250# Add CET specific flags if CET is enabled 251GCC_CET_FLAGS(CET_FLAGS) 252XCFLAGS="$XCFLAGS $CET_FLAGS" 253 254XCFLAGS="$XCFLAGS $XPCFLAGS" 255 256AC_SUBST(config_path) 257AC_SUBST(XCFLAGS) 258AC_SUBST(XLDFLAGS) 259AC_SUBST(LIBS) 260AC_SUBST(SIZES) 261 262AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes) 263AM_CONDITIONAL(ARCH_AARCH64_LINUX, 264 [expr "$config_path" : ".* linux/aarch64 .*" > /dev/null]) 265AM_CONDITIONAL(ARCH_ARM_LINUX, 266 [expr "$config_path" : ".* linux/arm .*" > /dev/null]) 267AM_CONDITIONAL(ARCH_I386, 268 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4]) 269AM_CONDITIONAL(ARCH_X86_64, 270 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8]) 271 272# Determine what GCC version number to use in filesystem paths. 273GCC_BASE_VER 274 275if test ${multilib} = yes; then 276 multilib_arg="--enable-multilib" 277else 278 multilib_arg= 279fi 280 281AC_CONFIG_FILES(Makefile testsuite/Makefile) 282AC_OUTPUT 283