1# Process this file with autoreconf to produce a configure script. 2# Copyright (C) 2012-2018 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_PREREQ(2.59) 26AC_INIT([GNU Atomic Library], 1.0,,[libatomic]) 27AC_CONFIG_HEADER(auto-config.h) 28 29# ------- 30# Options 31# ------- 32 33AC_MSG_CHECKING([for --enable-version-specific-runtime-libs]) 34LIBAT_ENABLE(version-specific-runtime-libs, no, , 35 [Specify that runtime libraries should be installed in a compiler-specific directory], 36 permit yes|no) 37AC_MSG_RESULT($enable_version_specific_runtime_libs) 38 39# We would like our source tree to be readonly. However when releases or 40# pre-releases are generated, the flex/bison generated files as well as the 41# various formats of manuals need to be included along with the rest of the 42# sources. Therefore we have --enable-generated-files-in-srcdir to do 43# just that. 44AC_MSG_CHECKING([for --enable-generated-files-in-srcdir]) 45LIBAT_ENABLE(generated-files-in-srcdir, no, , 46 [put copies of generated files in source dir intended for creating source 47 tarballs for users without texinfo bison or flex.], 48 permit yes|no) 49AC_MSG_RESULT($enable_generated_files_in_srcdir) 50AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes) 51 52 53# ------- 54 55# Gets build, host, target, *_vendor, *_cpu, *_os, etc. 56# 57# You will slowly go insane if you do not grok the following fact: when 58# building this library, the top-level /target/ becomes the library's /host/. 59# 60# configure then causes --target to default to --host, exactly like any 61# other package using autoconf. Therefore, 'target' and 'host' will 62# always be the same. This makes sense both for native and cross compilers 63# just think about it for a little while. :-) 64# 65# Also, if this library is being configured as part of a cross compiler, the 66# top-level configure script will pass the "real" host as $with_cross_host. 67# 68# Do not delete or change the following two lines. For why, see 69# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html 70AC_CANONICAL_SYSTEM 71target_alias=${target_alias-$host_alias} 72 73# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the 74# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am. 75# 1.9.0: minimum required version 76# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch 77# of other PACKAGE_* variables will, however, and there's nothing 78# we can do about that; they come from AC_INIT). 79# no-dist: we don't want 'dist' and related rules. 80# foreign: we don't follow the normal rules for GNU packages (no COPYING 81# file in the top srcdir, etc, etc), so stop complaining. 82# -Wall: turns on all automake warnings... 83# -Wno-portability: ...except this one, since GNU make is required. 84# -Wno-override: ... and this one, since we do want this in testsuite. 85AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override]) 86AM_ENABLE_MULTILIB(, ..) 87 88# Calculate toolexeclibdir 89# Also toolexecdir, though it's only used in toolexeclibdir 90case ${enable_version_specific_runtime_libs} in 91 yes) 92 # Need the gcc compiler version to know where to install libraries 93 # and header files if --enable-version-specific-runtime-libs option 94 # is selected. 95 toolexecdir='$(libdir)/gcc/$(target_alias)' 96 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)' 97 ;; 98 no) 99 if test -n "$with_cross_host" && 100 test x"$with_cross_host" != x"no"; then 101 # Install a library built with a cross compiler in tooldir, not libdir. 102 toolexecdir='$(exec_prefix)/$(target_alias)' 103 toolexeclibdir='$(toolexecdir)/lib' 104 else 105 toolexecdir='$(libdir)/gcc-lib/$(target_alias)' 106 toolexeclibdir='$(libdir)' 107 fi 108 multi_os_directory=`$CC -print-multi-os-directory` 109 case $multi_os_directory in 110 .) ;; # Avoid trailing /. 111 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;; 112 esac 113 ;; 114esac 115AC_SUBST(toolexecdir) 116AC_SUBST(toolexeclibdir) 117 118# Check the compiler. 119# The same as in boehm-gc and libstdc++. Have to borrow it from there. 120# We must force CC to /not/ be precious variables; otherwise 121# the wrong, non-multilib-adjusted value will be used in multilibs. 122# As a side effect, we have to subst CFLAGS ourselves. 123 124m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS]) 125m4_define([_AC_ARG_VAR_PRECIOUS],[]) 126AC_PROG_CC 127AM_PROG_AS 128m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) 129 130AC_SUBST(CFLAGS) 131 132# In order to override CFLAGS_FOR_TARGET, all of our special flags go 133# in XCFLAGS. But we need them in CFLAGS during configury. So put them 134# in both places for now and restore CFLAGS at the end of config. 135save_CFLAGS="$CFLAGS" 136 137# Find other programs we need. 138AC_CHECK_TOOL(AR, ar) 139AC_CHECK_TOOL(NM, nm) 140AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error) 141AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error) 142AC_PROG_INSTALL 143 144# Configure libtool 145AM_PROG_LIBTOOL 146ACX_LT_HOST_FLAGS 147AC_SUBST(enable_shared) 148AC_SUBST(enable_static) 149AM_MAINTAINER_MODE 150 151# For libtool versioning info, format is CURRENT:REVISION:AGE 152libtool_VERSION=3:0:2 153AC_SUBST(libtool_VERSION) 154 155# Check for used threading-model 156AC_MSG_CHECKING([for thread model used by GCC]) 157target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'` 158AC_MSG_RESULT([$target_thread_file]) 159 160case "$target" in 161 *aarch64*) 162 ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse]) 163 ;; 164esac 165 166# Get target configury. 167. ${srcdir}/configure.tgt 168if test -n "$UNSUPPORTED"; then 169 AC_MSG_ERROR([Configuration ${target} is unsupported.]) 170fi 171 172# Write out the ifunc resolver arg type. 173AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS, 174 [Define ifunc resolver function argument.]) 175 176# Disable fallbacks to __sync routines from libgcc. Otherwise we'll 177# make silly decisions about what the cpu can do. 178CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS" 179 180# Check header files. 181AC_STDC_HEADERS 182ACX_HEADER_STRING 183GCC_HEADER_STDINT(gstdint.h) 184AC_CHECK_HEADERS([fenv.h]) 185 186# Check for common type sizes 187LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE]) 188 189# Check for compiler builtins of atomic operations. 190LIBAT_TEST_ATOMIC_INIT 191LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE]) 192LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS]) 193LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE]) 194LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS]) 195LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD]) 196LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP]) 197 198AC_C_BIGENDIAN 199# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE. 200AH_BOTTOM( 201[#ifndef WORDS_BIGENDIAN 202#define WORDS_BIGENDIAN 0 203#endif]) 204 205LIBAT_WORDSIZE 206 207# Check to see if -pthread or -lpthread is needed. Prefer the former. 208# In case the pthread.h system header is not found, this test will fail. 209case " $config_path " in 210 *" posix "*) 211 XPCFLAGS="" 212 CFLAGS="$CFLAGS -pthread" 213 AC_LINK_IFELSE( 214 [AC_LANG_PROGRAM( 215 [#include <pthread.h> 216 void *g(void *d) { return NULL; }], 217 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], 218 [XPCFLAGS=" -pthread"], 219 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS" 220 AC_LINK_IFELSE( 221 [AC_LANG_PROGRAM( 222 [#include <pthread.h> 223 void *g(void *d) { return NULL; }], 224 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], 225 [], 226 [AC_MSG_ERROR([Pthreads are required to build libatomic])])]) 227 CFLAGS="$save_CFLAGS $XPCFLAGS" 228 ;; 229esac 230 231# See what sort of export controls are available. 232LIBAT_CHECK_ATTRIBUTE_VISIBILITY 233LIBAT_CHECK_ATTRIBUTE_DLLEXPORT 234LIBAT_CHECK_ATTRIBUTE_ALIAS 235if test x$try_ifunc = xyes; then 236 LIBAT_CHECK_IFUNC 237fi 238 239# Check linker support. 240LIBAT_ENABLE_SYMVERS 241 242# Cleanup and exit. 243CFLAGS="$save_CFLAGS" 244AC_CACHE_SAVE 245 246# Add -Wall -Werror if we are using GCC. 247if test "x$GCC" = "xyes"; then 248 XCFLAGS="$XCFLAGS -Wall -Werror" 249fi 250 251# Add CET specific flags if CET is enabled 252GCC_CET_FLAGS(CET_FLAGS) 253XCFLAGS="$XCFLAGS $CET_FLAGS" 254 255XCFLAGS="$XCFLAGS $XPCFLAGS" 256 257AC_SUBST(config_path) 258AC_SUBST(XCFLAGS) 259AC_SUBST(XLDFLAGS) 260AC_SUBST(LIBS) 261AC_SUBST(SIZES) 262 263AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes) 264AM_CONDITIONAL(ARCH_AARCH64_LINUX, 265 [expr "$config_path" : ".* linux/aarch64 .*" > /dev/null]) 266AM_CONDITIONAL(ARCH_ARM_LINUX, 267 [expr "$config_path" : ".* linux/arm .*" > /dev/null]) 268AM_CONDITIONAL(ARCH_I386, 269 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4]) 270AM_CONDITIONAL(ARCH_X86_64, 271 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8]) 272 273# Determine what GCC version number to use in filesystem paths. 274GCC_BASE_VER 275 276if test ${multilib} = yes; then 277 multilib_arg="--enable-multilib" 278else 279 multilib_arg= 280fi 281 282AC_CONFIG_FILES(Makefile testsuite/Makefile) 283AC_OUTPUT 284