1# configure.ac -- Backtrace configure script. 2# Copyright (C) 2012-2020 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_INIT(package-unused, version-unused,, libbacktrace) 33AC_CONFIG_SRCDIR(backtrace.h) 34AC_CONFIG_HEADER(config.h) 35 36if test -n "${with_target_subdir}"; then 37 AM_ENABLE_MULTILIB(, ..) 38fi 39 40AC_CANONICAL_SYSTEM 41target_alias=${target_alias-$host_alias} 42 43AC_USE_SYSTEM_EXTENSIONS 44 45libtool_VERSION=1:0:0 46AC_SUBST(libtool_VERSION) 47 48# 1.11.1: Require that version of automake. 49# foreign: Don't require README, INSTALL, NEWS, etc. 50# no-define: Don't define PACKAGE and VERSION. 51# no-dependencies: Don't generate automatic dependencies. 52# (because it breaks when using bootstrap-lean, since some of the 53# headers are gone at "make install" time). 54# -Wall: Issue all automake warnings. 55# -Wno-portability: Don't warn about constructs supported by GNU make. 56# (because GCC requires GNU make anyhow). 57AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability]) 58 59AM_MAINTAINER_MODE 60 61AC_ARG_WITH(target-subdir, 62[ --with-target-subdir=SUBDIR Configuring in a subdirectory for target]) 63 64# We must force CC to /not/ be precious variables; otherwise 65# the wrong, non-multilib-adjusted value will be used in multilibs. 66# As a side effect, we have to subst CFLAGS ourselves. 67m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS]) 68m4_define([_AC_ARG_VAR_PRECIOUS],[]) 69AC_PROG_CC 70m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) 71 72AC_SUBST(CFLAGS) 73 74AC_PROG_RANLIB 75 76AC_PROG_AWK 77case "$AWK" in 78"") AC_MSG_ERROR([can't build without awk]) ;; 79esac 80 81AC_CHECK_PROG(DWZ, dwz, dwz) 82AM_CONDITIONAL(HAVE_DWZ, test "$DWZ" != "") 83 84LT_INIT 85AM_PROG_LIBTOOL 86 87AC_SYS_LARGEFILE 88 89backtrace_supported=yes 90 91if test -n "${with_target_subdir}"; then 92 # We are compiling a GCC library. We can assume that the unwind 93 # library exists. 94 BACKTRACE_FILE="backtrace.lo simple.lo" 95else 96 AC_CHECK_HEADER([unwind.h], 97 [AC_CHECK_FUNC([_Unwind_Backtrace], 98 [BACKTRACE_FILE="backtrace.lo simple.lo"], 99 [BACKTRACE_FILE="nounwind.lo" 100 backtrace_supported=no])], 101 [BACKTRACE_FILE="nounwind.lo" 102 backtrace_supported=no]) 103fi 104AC_SUBST(BACKTRACE_FILE) 105 106EXTRA_FLAGS= 107if test -n "${with_target_subdir}"; then 108 EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@" 109else 110 AC_CACHE_CHECK([for -funwind-tables option], 111 [libbacktrace_cv_c_unwind_tables], 112 [CFLAGS_hold="$CFLAGS" 113 CFLAGS="$CFLAGS -funwind-tables" 114 AC_COMPILE_IFELSE( 115 [AC_LANG_PROGRAM([static int f() { return 0; }], [return f();])], 116 [libbacktrace_cv_c_unwind_tables=yes], 117 [libbacktrace_cv_c_unwind_tables=no]) 118 CFLAGS="$CFLAGS_hold"]) 119 if test "$libbacktrace_cv_c_unwind_tables" = "yes"; then 120 EXTRA_FLAGS=-funwind-tables 121 fi 122 AC_CACHE_CHECK([for -frandom-seed=string option], 123 [libbacktrace_cv_c_random_seed_string], 124 [CFLAGS_hold="$CFLAGS" 125 CFLAGS="$CFLAGS -frandom-seed=conftest.lo" 126 AC_COMPILE_IFELSE( 127 [AC_LANG_PROGRAM([], [return 0;])], 128 [libbacktrace_cv_c_random_seed_string=yes], 129 [libbacktrace_cv_c_random_seed_string=no]) 130 CFLAGS="$CFLAGS_hold"]) 131 if test "$libbacktrace_cv_c_random_seed_string" = "yes"; then 132 EXTRA_FLAGS="$EXTRA_FLAGS -frandom-seed=\$@" 133 fi 134fi 135 136if test -n "${with_target_subdir}"; then 137 # Add CET specific flags is Intel CET is enabled. 138 GCC_CET_FLAGS(CET_FLAGS) 139 EXTRA_FLAGS="$EXTRA_FLAGS $CET_FLAGS" 140fi 141AC_SUBST(EXTRA_FLAGS) 142 143ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \ 144 -Wmissing-prototypes -Wold-style-definition \ 145 -Wmissing-format-attribute -Wcast-qual], 146 [WARN_FLAGS]) 147 148if test -n "${with_target_subdir}"; then 149 WARN_FLAGS="$WARN_FLAGS -Werror" 150fi 151 152AC_SUBST(WARN_FLAGS) 153 154if test -n "${with_target_subdir}"; then 155 GCC_CHECK_UNWIND_GETIPINFO 156else 157 ac_save_CFFLAGS="$CFLAGS" 158 CFLAGS="$CFLAGS -Werror-implicit-function-declaration" 159 AC_MSG_CHECKING([for _Unwind_GetIPInfo]) 160 AC_LINK_IFELSE( 161 [AC_LANG_PROGRAM( 162 [#include "unwind.h" 163 struct _Unwind_Context *context; 164 int ip_before_insn = 0;], 165 [return _Unwind_GetIPInfo (context, &ip_before_insn);])], 166 [have_unwind_getipinfo=yes], [have_unwind_getipinfo=no]) 167 CFLAGS="$ac_save_CFLAGS" 168 AC_MSG_RESULT([$have_unwind_getipinfo]) 169 if test "$have_unwind_getipinfo" = "yes"; then 170 AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.]) 171 fi 172fi 173 174# Enable --enable-host-shared. 175AC_ARG_ENABLE(host-shared, 176[AS_HELP_STRING([--enable-host-shared], 177 [build host code as shared libraries])], 178[PIC_FLAG=-fPIC], [PIC_FLAG=]) 179AC_SUBST(PIC_FLAG) 180 181# Test for __sync support. 182AC_CACHE_CHECK([__sync extensions], 183[libbacktrace_cv_sys_sync], 184[if test -n "${with_target_subdir}"; then 185 case "${host}" in 186 hppa*-*-hpux*) libbacktrace_cv_sys_sync=no ;; 187 *) libbacktrace_cv_sys_sync=yes ;; 188 esac 189 else 190 AC_LINK_IFELSE( 191 [AC_LANG_PROGRAM([int i;], 192 [__sync_bool_compare_and_swap (&i, i, i); 193 __sync_lock_test_and_set (&i, 1); 194 __sync_lock_release (&i);])], 195 [libbacktrace_cv_sys_sync=yes], 196 [libbacktrace_cv_sys_sync=no]) 197 fi]) 198BACKTRACE_SUPPORTS_THREADS=0 199if test "$libbacktrace_cv_sys_sync" = "yes"; then 200 BACKTRACE_SUPPORTS_THREADS=1 201 AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1, 202 [Define to 1 if you have the __sync functions]) 203fi 204AC_SUBST(BACKTRACE_SUPPORTS_THREADS) 205 206# Test for __atomic support. 207AC_CACHE_CHECK([__atomic extensions], 208[libbacktrace_cv_sys_atomic], 209[if test -n "${with_target_subdir}"; then 210 libbacktrace_cv_sys_atomic=yes 211 else 212 AC_LINK_IFELSE( 213 [AC_LANG_PROGRAM([int i;], 214 [__atomic_load_n (&i, __ATOMIC_ACQUIRE); 215 __atomic_store_n (&i, 1, __ATOMIC_RELEASE);])], 216 [libbacktrace_cv_sys_atomic=yes], 217 [libbacktrace_cv_sys_atomic=no]) 218 fi]) 219if test "$libbacktrace_cv_sys_atomic" = "yes"; then 220 AC_DEFINE([HAVE_ATOMIC_FUNCTIONS], 1, 221 [Define to 1 if you have the __atomic functions]) 222fi 223 224# The library needs to be able to read the executable itself. Compile 225# a file to determine the executable format. The awk script 226# filetype.awk prints out the file type. 227AC_CACHE_CHECK([output filetype], 228[libbacktrace_cv_sys_filetype], 229[filetype= 230AC_COMPILE_IFELSE( 231 [AC_LANG_PROGRAM([int i;], [int j;])], 232 [filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`], 233 [AC_MSG_FAILURE([compiler failed])]) 234libbacktrace_cv_sys_filetype=$filetype]) 235 236# Match the file type to decide what files to compile. 237FORMAT_FILE= 238backtrace_supports_data=yes 239case "$libbacktrace_cv_sys_filetype" in 240elf*) FORMAT_FILE="elf.lo" ;; 241pecoff) FORMAT_FILE="pecoff.lo" 242 backtrace_supports_data=no 243 ;; 244xcoff*) FORMAT_FILE="xcoff.lo" 245 backtrace_supports_data=no 246 ;; 247*) AC_MSG_WARN([could not determine output file type]) 248 FORMAT_FILE="unknown.lo" 249 backtrace_supported=no 250 ;; 251esac 252AC_SUBST(FORMAT_FILE) 253 254# ELF defines. 255elfsize= 256case "$libbacktrace_cv_sys_filetype" in 257elf32) elfsize=32 ;; 258elf64) elfsize=64 ;; 259*) elfsize=unused 260esac 261AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64]) 262AM_CONDITIONAL(HAVE_ELF, test "$FORMAT_FILE" = "elf.lo") 263 264# XCOFF defines. 265xcoffsize= 266case "$libbacktrace_cv_sys_filetype" in 267xcoff32) xcoffsize=32 ;; 268xcoff64) xcoffsize=64 ;; 269*) xcoffsize=unused 270esac 271AC_DEFINE_UNQUOTED([BACKTRACE_XCOFF_SIZE], [$xcoffsize], [XCOFF size: 32 or 64]) 272 273BACKTRACE_SUPPORTED=0 274if test "$backtrace_supported" = "yes"; then 275 BACKTRACE_SUPPORTED=1 276fi 277AC_SUBST(BACKTRACE_SUPPORTED) 278 279BACKTRACE_SUPPORTS_DATA=0 280if test "$backtrace_supports_data" = "yes"; then 281 BACKTRACE_SUPPORTS_DATA=1 282fi 283AC_SUBST(BACKTRACE_SUPPORTS_DATA) 284 285GCC_HEADER_STDINT(gstdint.h) 286 287AC_CHECK_HEADERS(sys/mman.h) 288if test "$ac_cv_header_sys_mman_h" = "no"; then 289 have_mmap=no 290else 291 if test -n "${with_target_subdir}"; then 292 # When built as a GCC target library, we can't do a link test. We 293 # simply assume that if we have mman.h, we have mmap. 294 have_mmap=yes 295 case "${host}" in 296 *-*-msdosdjgpp) 297 # DJGPP has sys/man.h, but no mmap 298 have_mmap=no ;; 299 esac 300 else 301 AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no]) 302 fi 303fi 304if test "$have_mmap" = "no"; then 305 VIEW_FILE=read.lo 306 ALLOC_FILE=alloc.lo 307else 308 VIEW_FILE=mmapio.lo 309 AC_PREPROC_IFELSE([AC_LANG_SOURCE([ 310#include <sys/mman.h> 311#if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON) 312 #error no MAP_ANONYMOUS 313#endif 314])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo]) 315fi 316AC_SUBST(VIEW_FILE) 317AC_SUBST(ALLOC_FILE) 318 319BACKTRACE_USES_MALLOC=0 320if test "$ALLOC_FILE" = "alloc.lo"; then 321 BACKTRACE_USES_MALLOC=1 322fi 323AC_SUBST(BACKTRACE_USES_MALLOC) 324 325# Check for dl_iterate_phdr. 326AC_CHECK_HEADERS(link.h) 327if test "$ac_cv_header_link_h" = "no"; then 328 have_dl_iterate_phdr=no 329else 330 if test -n "${with_target_subdir}"; then 331 # When built as a GCC target library, we can't do a link test. 332 AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes], 333 [have_dl_iterate_phdr=no]) 334 else 335 AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes], 336 [have_dl_iterate_phdr=no]) 337 fi 338fi 339if test "$have_dl_iterate_phdr" = "yes"; then 340 AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.]) 341fi 342 343# Check for loadquery. 344AC_CHECK_HEADERS(sys/ldr.h) 345if test "$ac_cv_header_sys_ldr_h" = "no"; then 346 have_loadquery=no 347else 348 if test -n "${with_target_subdir}"; then 349 # When built as a GCC target library, we can't do a link test. 350 AC_EGREP_HEADER([loadquery], [sys/ldr.h], [have_loadquery=yes], 351 [have_loadquery=no]) 352 else 353 AC_CHECK_FUNC([loadquery], [have_loadquery=yes], 354 [have_loadquery=no]) 355 fi 356fi 357if test "$have_loadquery" = "yes"; then 358 AC_DEFINE(HAVE_LOADQUERY, 1, [Define if AIX loadquery is available.]) 359fi 360 361# Check for the fcntl function. 362if test -n "${with_target_subdir}"; then 363 case "${host}" in 364 *-*-mingw*) have_fcntl=no ;; 365 *) have_fcntl=yes ;; 366 esac 367else 368 AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no]) 369fi 370if test "$have_fcntl" = "yes"; then 371 AC_DEFINE([HAVE_FCNTL], 1, 372 [Define to 1 if you have the fcntl function]) 373fi 374 375AC_CHECK_DECLS(strnlen) 376AC_CHECK_FUNCS(lstat readlink) 377 378# Check for getexecname function. 379if test -n "${with_target_subdir}"; then 380 case "${host}" in 381 *-*-solaris2*) have_getexecname=yes ;; 382 *) have_getexecname=no ;; 383 esac 384else 385 AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no]) 386fi 387if test "$have_getexecname" = "yes"; then 388 AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.]) 389fi 390 391# Check for the clock_gettime function. 392AC_CHECK_FUNCS(clock_gettime) 393clock_gettime_link= 394# At least for glibc, clock_gettime is in librt. But don't 395# pull that in if it still doesn't give us the function we want. This 396# test is copied from libgomp, and modified to not link in -lrt as 397# we're using this for test timing only. 398if test "$ac_cv_func_clock_gettime" = no; then 399 AC_CHECK_LIB(rt, clock_gettime, 400 [CLOCK_GETTIME_LINK=-lrt 401 AC_DEFINE(HAVE_CLOCK_GETTIME, 1, 402 [Define to 1 if you have the `clock_gettime' function.])]) 403fi 404AC_SUBST(CLOCK_GETTIME_LINK) 405 406dnl Test whether the compiler supports the -pthread option. 407AC_CACHE_CHECK([whether -pthread is supported], 408[libgo_cv_lib_pthread], 409[CFLAGS_hold=$CFLAGS 410CFLAGS="$CFLAGS -pthread" 411AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])], 412[libgo_cv_lib_pthread=yes], 413[libgo_cv_lib_pthread=no]) 414CFLAGS=$CFLAGS_hold]) 415PTHREAD_CFLAGS= 416if test "$libgo_cv_lib_pthread" = yes; then 417 PTHREAD_CFLAGS=-pthread 418fi 419AC_SUBST(PTHREAD_CFLAGS) 420 421AM_CONDITIONAL(HAVE_PTHREAD, test "$libgo_cv_lib_pthread" = yes) 422 423dnl Test whether the compiler and the linker support the -gdwarf-5 option. 424AC_CACHE_CHECK([whether -gdwarf-5 is supported], 425[libbacktrace_cv_lib_dwarf5], 426[CFLAGS_hold=$CFLAGS 427CFLAGS="$CFLAGS -gdwarf-5" 428AC_LINK_IFELSE([AC_LANG_PROGRAM([int i;], [return 0;])], 429[libbacktrace_cv_lib_dwarf5=yes], 430[libbacktrace_cv_lib_dwarf5=no]) 431CFLAGS=$CFLAGS_hold]) 432AM_CONDITIONAL(HAVE_DWARF5, test "$libbacktrace_cv_lib_dwarf5" = yes) 433 434AC_CHECK_LIB([z], [compress], 435 [AC_DEFINE(HAVE_ZLIB, 1, [Define if -lz is available.])]) 436AM_CONDITIONAL(HAVE_ZLIB, test "$ac_cv_lib_z_compress" = yes) 437 438dnl Test whether the linker supports the --compress_debug_sections option. 439AC_CACHE_CHECK([whether --compress-debug-sections is supported], 440[libgo_cv_ld_compress], 441[LDFLAGS_hold=$LDFLAGS 442LDFLAGS="$LDFLAGS -Wl,--compress-debug-sections=zlib-gnu" 443AC_LINK_IFELSE([AC_LANG_PROGRAM(,)], 444[libgo_cv_ld_compress=yes], 445[libgo_cv_ld_compress=no]) 446LDFLAGS=$LDFLAGS_hold]) 447AM_CONDITIONAL(HAVE_COMPRESSED_DEBUG, test "$libgo_cv_ld_compress" = yes) 448 449AC_ARG_VAR(OBJCOPY, [location of objcopy]) 450AC_CHECK_PROG(OBJCOPY, objcopy, objcopy,) 451AC_CHECK_PROG(READELF, readelf, readelf) 452AC_CACHE_CHECK([whether objcopy supports debuglink], 453[libbacktrace_cv_objcopy_debuglink], 454[if test -n "${with_target_subdir}"; then 455 libbacktrace_cv_objcopy_debuglink=no 456elif ${OBJCOPY} --add-gnu-debuglink=x /bin/ls /tmp/ls$$; then 457 rm -f /tmp/ls$$ 458 libbacktrace_cv_objcopy_debuglink=yes 459else 460 libbacktrace_cv_objcopy_debuglink=no 461fi]) 462AM_CONDITIONAL(HAVE_OBJCOPY_DEBUGLINK, test "$libbacktrace_cv_objcopy_debuglink" = yes) 463 464AC_CACHE_CHECK([whether tests can run], 465 [libbacktrace_cv_sys_native], 466 [AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])], 467 [libbacktrace_cv_sys_native=yes], 468 [libbacktrace_cv_sys_native=no], 469 [libbacktrace_cv_sys_native=no])]) 470AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes") 471 472if test "${multilib}" = "yes"; then 473 multilib_arg="--enable-multilib" 474else 475 multilib_arg= 476fi 477 478AC_CONFIG_FILES(Makefile backtrace-supported.h) 479AC_CONFIG_FILES(install-debuginfo-for-buildid.sh, chmod +x install-debuginfo-for-buildid.sh) 480 481# We need multilib support, but only if configuring for the target. 482AC_CONFIG_COMMANDS([default], 483[if test -n "$CONFIG_FILES"; then 484 if test -n "${with_target_subdir}"; then 485 # Multilibs need MULTISUBDIR defined correctly in certain makefiles so 486 # that multilib installs will end up installed in the correct place. 487 # The testsuite needs it for multilib-aware ABI baseline files. 488 # To work around this not being passed down from config-ml.in -> 489 # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually 490 # append it here. Only modify Makefiles that have just been created. 491 # 492 # Also, get rid of this simulated-VPATH thing that automake does. 493 cat > vpsed << \_EOF 494 s!`test -f '$<' || echo '$(srcdir)/'`!! 495_EOF 496 for i in $SUBDIRS; do 497 case $CONFIG_FILES in 498 *${i}/Makefile*) 499 #echo "Adding MULTISUBDIR to $i/Makefile" 500 sed -f vpsed $i/Makefile > tmp 501 grep '^MULTISUBDIR =' Makefile >> tmp 502 mv tmp $i/Makefile 503 ;; 504 esac 505 done 506 rm vpsed 507 fi 508 fi 509], 510[ 511# Variables needed in config.status (file generation) which aren't already 512# passed by autoconf. 513SUBDIRS="$SUBDIRS" 514]) 515 516AC_OUTPUT 517