1# configure.ac -- Backtrace configure script. 2# Copyright (C) 2012-2015 Free Software Foundation, Inc. 3 4# Redistribution and use in source and binary forms, with or without 5# modification, are permitted provided that the following conditions are 6# met: 7 8# (1) Redistributions of source code must retain the above copyright 9# notice, this list of conditions and the following disclaimer. 10 11# (2) Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in 13# the documentation and/or other materials provided with the 14# distribution. 15 16# (3) The name of the author may not be used to 17# endorse or promote products derived from this software without 18# specific prior written permission. 19 20# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 22# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 23# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 24# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 25# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 26# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 28# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 29# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30# POSSIBILITY OF SUCH DAMAGE. 31 32AC_PREREQ(2.64) 33AC_INIT(package-unused, version-unused,, libbacktrace) 34AC_CONFIG_SRCDIR(backtrace.h) 35AC_CONFIG_HEADER(config.h) 36 37if test -n "${with_target_subdir}"; then 38 AM_ENABLE_MULTILIB(, ..) 39fi 40 41AC_CANONICAL_SYSTEM 42target_alias=${target_alias-$host_alias} 43 44AC_USE_SYSTEM_EXTENSIONS 45 46libtool_VERSION=1:0:0 47AC_SUBST(libtool_VERSION) 48 49# 1.11.1: Require that version of automake. 50# foreign: Don't require README, INSTALL, NEWS, etc. 51# no-define: Don't define PACKAGE and VERSION. 52# no-dependencies: Don't generate automatic dependencies. 53# (because it breaks when using bootstrap-lean, since some of the 54# headers are gone at "make install" time). 55# -Wall: Issue all automake warnings. 56# -Wno-portability: Don't warn about constructs supported by GNU make. 57# (because GCC requires GNU make anyhow). 58AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability]) 59 60AM_MAINTAINER_MODE 61 62AC_ARG_WITH(target-subdir, 63[ --with-target-subdir=SUBDIR Configuring in a subdirectory for target]) 64 65# We must force CC to /not/ be precious variables; otherwise 66# the wrong, non-multilib-adjusted value will be used in multilibs. 67# As a side effect, we have to subst CFLAGS ourselves. 68m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS]) 69m4_define([_AC_ARG_VAR_PRECIOUS],[]) 70AC_PROG_CC 71m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) 72 73AC_SUBST(CFLAGS) 74 75AC_PROG_RANLIB 76 77AC_PROG_AWK 78case "$AWK" in 79"") AC_MSG_ERROR([can't build without awk]) ;; 80esac 81 82LT_INIT([disable-shared]) 83AM_PROG_LIBTOOL 84 85backtrace_supported=yes 86 87if test -n "${with_target_subdir}"; then 88 # We are compiling a GCC library. We can assume that the unwind 89 # library exists. 90 BACKTRACE_FILE="backtrace.lo simple.lo" 91else 92 AC_CHECK_HEADER([unwind.h], 93 [AC_CHECK_FUNC([_Unwind_Backtrace], 94 [BACKTRACE_FILE="backtrace.lo simple.lo"], 95 [BACKTRACE_FILE="nounwind.lo" 96 backtrace_supported=no])], 97 [BACKTRACE_FILE="nounwind.lo" 98 backtrace_supported=no]) 99fi 100AC_SUBST(BACKTRACE_FILE) 101 102EXTRA_FLAGS= 103if test -n "${with_target_subdir}"; then 104 EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@" 105else 106 AC_CACHE_CHECK([for -funwind-tables option], 107 [libbacktrace_cv_c_unwind_tables], 108 [CFLAGS_hold="$CFLAGS" 109 CFLAGS="$CFLAGS -funwind-tables" 110 AC_COMPILE_IFELSE( 111 [AC_LANG_PROGRAM([static int f() { return 0; }], [return f();])], 112 [libbacktrace_cv_c_unwind_tables=yes], 113 [libbacktrace_cv_c_unwind_tables=no]) 114 CFLAGS="$CFLAGS_hold"]) 115 if test "$libbacktrace_cv_c_unwind_tables" = "yes"; then 116 EXTRA_FLAGS=-funwind-tables 117 fi 118 AC_CACHE_CHECK([for -frandom-seed=string option], 119 [libbacktrace_cv_c_random_seed_string], 120 [CFLAGS_hold="$CFLAGS" 121 CFLAGS="$CFLAGS -frandom-seed=conftest.lo" 122 AC_COMPILE_IFELSE( 123 [AC_LANG_PROGRAM([], [return 0;])], 124 [libbacktrace_cv_c_random_seed_string=yes], 125 [libbacktrace_cv_c_random_seed_string=no]) 126 CFLAGS="$CFLAGS_hold"]) 127 if test "$libbacktrace_cv_c_random_seed_string" = "yes"; then 128 EXTRA_FLAGS="$EXTRA_FLAGS -frandom-seed=\$@" 129 fi 130fi 131AC_SUBST(EXTRA_FLAGS) 132 133ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \ 134 -Wmissing-prototypes -Wold-style-definition \ 135 -Wmissing-format-attribute -Wcast-qual], 136 [WARN_FLAGS]) 137 138if test -n "${with_target_subdir}"; then 139 WARN_FLAGS="$WARN_FLAGS -Werror" 140fi 141 142AC_SUBST(WARN_FLAGS) 143 144if test -n "${with_target_subdir}"; then 145 GCC_CHECK_UNWIND_GETIPINFO 146else 147 ac_save_CFFLAGS="$CFLAGS" 148 CFLAGS="$CFLAGS -Werror-implicit-function-declaration" 149 AC_MSG_CHECKING([for _Unwind_GetIPInfo]) 150 AC_LINK_IFELSE( 151 [AC_LANG_PROGRAM( 152 [#include "unwind.h" 153 struct _Unwind_Context *context; 154 int ip_before_insn = 0;], 155 [return _Unwind_GetIPInfo (context, &ip_before_insn);])], 156 [have_unwind_getipinfo=yes], [have_unwind_getipinfo=no]) 157 CFLAGS="$ac_save_CFLAGS" 158 AC_MSG_RESULT([$have_unwind_getipinfo]) 159 if test "$have_unwind_getipinfo" = "yes"; then 160 AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.]) 161 fi 162fi 163 164# When building as a target library, shared libraries may want to link 165# this in. We don't want to provide another shared library to 166# complicate dependencies. Instead, we just compile with -fPIC. 167PIC_FLAG= 168if test -n "${with_target_subdir}"; then 169 PIC_FLAG=-fPIC 170fi 171# Similarly, use -fPIC with --enable-host-shared: 172AC_ARG_ENABLE(host-shared, 173[AS_HELP_STRING([--enable-host-shared], 174 [build host code as shared libraries])], 175[PIC_FLAG=-fPIC], []) 176AC_SUBST(PIC_FLAG) 177 178# Test for __sync support. 179AC_CACHE_CHECK([__sync extensions], 180[libbacktrace_cv_sys_sync], 181[if test -n "${with_target_subdir}"; then 182 libbacktrace_cv_sys_sync=yes 183 else 184 AC_LINK_IFELSE( 185 [AC_LANG_PROGRAM([int i;], 186 [__sync_bool_compare_and_swap (&i, i, i); 187 __sync_lock_test_and_set (&i, 1); 188 __sync_lock_release (&i);])], 189 [libbacktrace_cv_sys_sync=yes], 190 [libbacktrace_cv_sys_sync=no]) 191 fi]) 192BACKTRACE_SUPPORTS_THREADS=0 193if test "$libbacktrace_cv_sys_sync" = "yes"; then 194 BACKTRACE_SUPPORTS_THREADS=1 195 AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1, 196 [Define to 1 if you have the __sync functions]) 197fi 198AC_SUBST(BACKTRACE_SUPPORTS_THREADS) 199 200# Test for __atomic support. 201AC_CACHE_CHECK([__atomic extensions], 202[libbacktrace_cv_sys_atomic], 203[if test -n "${with_target_subdir}"; then 204 libbacktrace_cv_sys_atomic=yes 205 else 206 AC_LINK_IFELSE( 207 [AC_LANG_PROGRAM([int i;], 208 [__atomic_load_n (&i, __ATOMIC_ACQUIRE); 209 __atomic_store_n (&i, 1, __ATOMIC_RELEASE);])], 210 [libbacktrace_cv_sys_atomic=yes], 211 [libbacktrace_cv_sys_atomic=no]) 212 fi]) 213if test "$libbacktrace_cv_sys_atomic" = "yes"; then 214 AC_DEFINE([HAVE_ATOMIC_FUNCTIONS], 1, 215 [Define to 1 if you have the __atomic functions]) 216fi 217 218# The library needs to be able to read the executable itself. Compile 219# a file to determine the executable format. The awk script 220# filetype.awk prints out the file type. 221AC_CACHE_CHECK([output filetype], 222[libbacktrace_cv_sys_filetype], 223[filetype= 224AC_COMPILE_IFELSE( 225 [AC_LANG_PROGRAM([int i;], [int j;])], 226 [filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`], 227 [AC_MSG_FAILURE([compiler failed])]) 228libbacktrace_cv_sys_filetype=$filetype]) 229 230# Match the file type to decide what files to compile. 231FORMAT_FILE= 232case "$libbacktrace_cv_sys_filetype" in 233elf*) FORMAT_FILE="elf.lo" ;; 234*) AC_MSG_WARN([could not determine output file type]) 235 FORMAT_FILE="unknown.lo" 236 backtrace_supported=no 237 ;; 238esac 239AC_SUBST(FORMAT_FILE) 240 241# ELF defines. 242elfsize= 243case "$libbacktrace_cv_sys_filetype" in 244elf32) elfsize=32 ;; 245elf64) elfsize=64 ;; 246esac 247AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64]) 248 249BACKTRACE_SUPPORTED=0 250if test "$backtrace_supported" = "yes"; then 251 BACKTRACE_SUPPORTED=1 252fi 253AC_SUBST(BACKTRACE_SUPPORTED) 254 255GCC_HEADER_STDINT(gstdint.h) 256 257AC_CHECK_HEADERS(sys/mman.h) 258if test "$ac_cv_header_sys_mman_h" = "no"; then 259 have_mmap=no 260else 261 if test -n "${with_target_subdir}"; then 262 # When built as a GCC target library, we can't do a link test. We 263 # simply assume that if we have mman.h, we have mmap. 264 have_mmap=yes 265 else 266 AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no]) 267 fi 268fi 269if test "$have_mmap" = "no"; then 270 VIEW_FILE=read.lo 271 ALLOC_FILE=alloc.lo 272else 273 VIEW_FILE=mmapio.lo 274 AC_PREPROC_IFELSE([ 275#include <sys/mman.h> 276#if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON) 277 #error no MAP_ANONYMOUS 278#endif 279], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo]) 280fi 281AC_SUBST(VIEW_FILE) 282AC_SUBST(ALLOC_FILE) 283 284BACKTRACE_USES_MALLOC=0 285if test "$ALLOC_FILE" = "alloc.lo"; then 286 BACKTRACE_USES_MALLOC=1 287fi 288AC_SUBST(BACKTRACE_USES_MALLOC) 289 290# Check for dl_iterate_phdr. 291AC_CHECK_HEADERS(link.h) 292if test "$ac_cv_header_link_h" = "no"; then 293 have_dl_iterate_phdr=no 294else 295 if test -n "${with_target_subdir}"; then 296 # When built as a GCC target library, we can't do a link test. 297 AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes], 298 [have_dl_iterate_phdr=no]) 299 case "${host}" in 300 *-*-solaris2.10*) 301 # Avoid dl_iterate_phdr on Solaris 10, where it is in the 302 # header file but is only in -ldl. 303 have_dl_iterate_phdr=no ;; 304 esac 305 else 306 AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes], 307 [have_dl_iterate_phdr=no]) 308 fi 309fi 310if test "$have_dl_iterate_phdr" = "yes"; then 311 AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.]) 312fi 313 314# Check for the fcntl function. 315if test -n "${with_target_subdir}"; then 316 case "${host}" in 317 *-*-mingw*) have_fcntl=no ;; 318 *) have_fcntl=yes ;; 319 esac 320else 321 AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no]) 322fi 323if test "$have_fcntl" = "yes"; then 324 AC_DEFINE([HAVE_FCNTL], 1, 325 [Define to 1 if you have the fcntl function]) 326fi 327 328AC_CHECK_DECLS(strnlen) 329 330# Check for getexecname function. 331if test -n "${with_target_subdir}"; then 332 case "${host}" in 333 *-*-solaris2*) have_getexecname=yes ;; 334 *) have_getexecname=no ;; 335 esac 336else 337 AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no]) 338fi 339if test "$have_getexecname" = "yes"; then 340 AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.]) 341fi 342 343AC_CACHE_CHECK([whether tests can run], 344 [libbacktrace_cv_sys_native], 345 [AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])], 346 [libbacktrace_cv_sys_native=yes], 347 [libbacktrace_cv_sys_native=no], 348 [libbacktrace_cv_sys_native=no])]) 349AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes") 350 351if test "${multilib}" = "yes"; then 352 multilib_arg="--enable-multilib" 353else 354 multilib_arg= 355fi 356 357AC_CONFIG_FILES(Makefile backtrace-supported.h) 358 359# We need multilib support, but only if configuring for the target. 360AC_CONFIG_COMMANDS([default], 361[if test -n "$CONFIG_FILES"; then 362 if test -n "${with_target_subdir}"; then 363 # Multilibs need MULTISUBDIR defined correctly in certain makefiles so 364 # that multilib installs will end up installed in the correct place. 365 # The testsuite needs it for multilib-aware ABI baseline files. 366 # To work around this not being passed down from config-ml.in -> 367 # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually 368 # append it here. Only modify Makefiles that have just been created. 369 # 370 # Also, get rid of this simulated-VPATH thing that automake does. 371 cat > vpsed << \_EOF 372 s!`test -f '$<' || echo '$(srcdir)/'`!! 373_EOF 374 for i in $SUBDIRS; do 375 case $CONFIG_FILES in 376 *${i}/Makefile*) 377 #echo "Adding MULTISUBDIR to $i/Makefile" 378 sed -f vpsed $i/Makefile > tmp 379 grep '^MULTISUBDIR =' Makefile >> tmp 380 mv tmp $i/Makefile 381 ;; 382 esac 383 done 384 rm vpsed 385 fi 386 fi 387], 388[ 389# Variables needed in config.status (file generation) which aren't already 390# passed by autoconf. 391SUBDIRS="$SUBDIRS" 392]) 393 394AC_OUTPUT 395