libbacktrace/configure.ac

   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
  32 AC_INIT(package-unused, version-unused,, libbacktrace)
  33 AC_CONFIG_SRCDIR(backtrace.h)
  34 AC_CONFIG_HEADER(config.h)
  35
  36 if test -n "${with_target_subdir}"; then
  37   AM_ENABLE_MULTILIB(, ..)
  38 fi
  39
  40 AC_CANONICAL_SYSTEM
  41 target_alias=${target_alias-$host_alias}
  42
  43 AC_USE_SYSTEM_EXTENSIONS
  44
  45 libtool_VERSION=1:0:0
  46 AC_SUBST(libtool_VERSION)
  47
  48 # 1.11.1: Require that version of automake.
  49 # foreign: Don't require README, INSTALL, NEWS, etc.
  50 # no-define: Don't define PACKAGE and VERSION.
  51 # no-dependencies: Don't generate automatic dependencies.
  52 #    (because it breaks when using bootstrap-lean, since some of the
  53 #    headers are gone at "make install" time).
  54 # -Wall: Issue all automake warnings.
  55 # -Wno-portability: Don't warn about constructs supported by GNU make.
  56 #    (because GCC requires GNU make anyhow).
  57 AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability])
  58
  59 AM_MAINTAINER_MODE
  60
  61 AC_ARG_WITH(target-subdir,
  62 [  --with-target-subdir=SUBDIR      Configuring in a subdirectory for target])
  63
  64 # We must force CC to /not/ be precious variables; otherwise
  65 # the wrong, non-multilib-adjusted value will be used in multilibs.
  66 # As a side effect, we have to subst CFLAGS ourselves.
  67 m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS])
  68 m4_define([_AC_ARG_VAR_PRECIOUS],[])
  69 AC_PROG_CC
  70 m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
  71
  72 AC_SUBST(CFLAGS)
  73
  74 AC_PROG_RANLIB
  75
  76 AC_PROG_AWK
  77 case "$AWK" in
  78 "") AC_MSG_ERROR([can't build without awk]) ;;
  79 esac
  80
  81 AC_CHECK_PROG(DWZ, dwz, dwz)
  82 AM_CONDITIONAL(HAVE_DWZ, test "$DWZ" != "")
  83
  84 LT_INIT
  85 AM_PROG_LIBTOOL
  86
  87 AC_SYS_LARGEFILE
  88
  89 backtrace_supported=yes
  90
  91 if test -n "${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"
  95 else
  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])
 103 fi
 104 AC_SUBST(BACKTRACE_FILE)
 105
 106 EXTRA_FLAGS=
 107 if test -n "${with_target_subdir}"; then
 108   EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@"
 109 else
 110   AC_CACHE_CHECK([for -funwind-tables option],
 111     [libbacktrace_cv_c_unwind_tables],
 112     [CFLAGS_hold="$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
 134 fi
 135
 136 if 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 $CET_FLAGS"
 140 fi
 141 AC_SUBST(EXTRA_FLAGS)
 142
 143 ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
 144                           -Wmissing-prototypes -Wold-style-definition \
 145                           -Wmissing-format-attribute -Wcast-qual],
 146                           [WARN_FLAGS])
 147
 148 if test -n "${with_target_subdir}"; then
 149   WARN_FLAGS="$WARN_FLAGS -Werror"
 150 fi
 151
 152 AC_SUBST(WARN_FLAGS)
 153
 154 if test -n "${with_target_subdir}"; then
 155   GCC_CHECK_UNWIND_GETIPINFO
 156 else
 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 "$have_unwind_getipinfo" = "yes"; then
 170     AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
 171   fi
 172 fi
 173
 174 # Enable --enable-host-shared.
 175 AC_ARG_ENABLE(host-shared,
 176 [AS_HELP_STRING([--enable-host-shared],
 177                 [build host code as shared libraries])],
 178 [PIC_FLAG=-fPIC], [PIC_FLAG=])
 179 AC_SUBST(PIC_FLAG)
 180
 181 # Enable Intel CET on Intel CET enabled host if jit is enabled.
 182 GCC_CET_HOST_FLAGS(CET_HOST_FLAGS)
 183 case x$enable_languages in
 184 *jit*)
 185   ;;
 186 *)
 187   CET_HOST_FLAGS=
 188   ;;
 189 esac
 190 AC_SUBST(CET_HOST_FLAGS)
 191
 192 # Test for __sync support.
 193 AC_CACHE_CHECK([__sync extensions],
 194 [libbacktrace_cv_sys_sync],
 195 [if test -n "${with_target_subdir}"; then
 196    case "${host}" in
 197    hppa*-*-hpux*) libbacktrace_cv_sys_sync=no ;;
 198    *) libbacktrace_cv_sys_sync=yes ;;
 199    esac
 200  else
 201    AC_LINK_IFELSE(
 202      [AC_LANG_PROGRAM([int i;],
 203                       [__sync_bool_compare_and_swap (&i, i, i);
 204                        __sync_lock_test_and_set (&i, 1);
 205                        __sync_lock_release (&i);])],
 206      [libbacktrace_cv_sys_sync=yes],
 207      [libbacktrace_cv_sys_sync=no])
 208  fi])
 209 BACKTRACE_SUPPORTS_THREADS=0
 210 if test "$libbacktrace_cv_sys_sync" = "yes"; then
 211   BACKTRACE_SUPPORTS_THREADS=1
 212   AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1,
 213             [Define to 1 if you have the __sync functions])
 214 fi
 215 AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
 216
 217 # Test for __atomic support.
 218 AC_CACHE_CHECK([__atomic extensions],
 219 [libbacktrace_cv_sys_atomic],
 220 [if test -n "${with_target_subdir}"; then
 221    libbacktrace_cv_sys_atomic=yes
 222  else
 223    AC_LINK_IFELSE(
 224      [AC_LANG_PROGRAM([int i;],
 225                       [__atomic_load_n (&i, __ATOMIC_ACQUIRE);
 226                        __atomic_store_n (&i, 1, __ATOMIC_RELEASE);])],
 227      [libbacktrace_cv_sys_atomic=yes],
 228      [libbacktrace_cv_sys_atomic=no])
 229  fi])
 230 if test "$libbacktrace_cv_sys_atomic" = "yes"; then
 231   AC_DEFINE([HAVE_ATOMIC_FUNCTIONS], 1,
 232             [Define to 1 if you have the __atomic functions])
 233 fi
 234
 235 # The library needs to be able to read the executable itself.  Compile
 236 # a file to determine the executable format.  The awk script
 237 # filetype.awk prints out the file type.
 238 AC_CACHE_CHECK([output filetype],
 239 [libbacktrace_cv_sys_filetype],
 240 [filetype=
 241 AC_COMPILE_IFELSE(
 242   [AC_LANG_PROGRAM([int i;], [int j;])],
 243   [filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`],
 244   [AC_MSG_FAILURE([compiler failed])])
 245 libbacktrace_cv_sys_filetype=$filetype])
 246
 247 # Match the file type to decide what files to compile.
 248 FORMAT_FILE=
 249 backtrace_supports_data=yes
 250 case "$libbacktrace_cv_sys_filetype" in
 251 elf*) FORMAT_FILE="elf.lo" ;;
 252 macho) FORMAT_FILE="macho.lo" ;;
 253 pecoff) FORMAT_FILE="pecoff.lo"
 254         backtrace_supports_data=no
 255         ;;
 256 xcoff*) FORMAT_FILE="xcoff.lo"
 257         backtrace_supports_data=no
 258         ;;
 259 *) AC_MSG_WARN([could not determine output file type])
 260    FORMAT_FILE="unknown.lo"
 261    backtrace_supported=no
 262    ;;
 263 esac
 264 AC_SUBST(FORMAT_FILE)
 265
 266 # ELF defines.
 267 elfsize=
 268 case "$libbacktrace_cv_sys_filetype" in
 269 elf32) elfsize=32 ;;
 270 elf64) elfsize=64 ;;
 271 *)     elfsize=unused
 272 esac
 273 AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])
 274 AM_CONDITIONAL(HAVE_ELF, test "$FORMAT_FILE" = "elf.lo")
 275
 276 # XCOFF defines.
 277 xcoffsize=
 278 case "$libbacktrace_cv_sys_filetype" in
 279 xcoff32) xcoffsize=32 ;;
 280 xcoff64) xcoffsize=64 ;;
 281 *)       xcoffsize=unused
 282 esac
 283 AC_DEFINE_UNQUOTED([BACKTRACE_XCOFF_SIZE], [$xcoffsize], [XCOFF size: 32 or 64])
 284
 285 BACKTRACE_SUPPORTED=0
 286 if test "$backtrace_supported" = "yes"; then
 287   BACKTRACE_SUPPORTED=1
 288 fi
 289 AC_SUBST(BACKTRACE_SUPPORTED)
 290
 291 BACKTRACE_SUPPORTS_DATA=0
 292 if test "$backtrace_supports_data" = "yes"; then
 293   BACKTRACE_SUPPORTS_DATA=1
 294 fi
 295 AC_SUBST(BACKTRACE_SUPPORTS_DATA)
 296
 297 GCC_HEADER_STDINT(gstdint.h)
 298
 299 AC_CHECK_HEADERS(sys/mman.h)
 300 if test "$ac_cv_header_sys_mman_h" = "no"; then
 301   have_mmap=no
 302 else
 303   if test -n "${with_target_subdir}"; then
 304     # When built as a GCC target library, we can't do a link test.  We
 305     # simply assume that if we have mman.h, we have mmap.
 306     have_mmap=yes
 307     case "${host}" in
 308     *-*-msdosdjgpp)
 309         # DJGPP has sys/man.h, but no mmap
 310         have_mmap=no ;;
 311     esac
 312   else
 313     AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
 314   fi
 315 fi
 316 if test "$have_mmap" = "no"; then
 317   VIEW_FILE=read.lo
 318   ALLOC_FILE=alloc.lo
 319 else
 320   VIEW_FILE=mmapio.lo
 321   AC_PREPROC_IFELSE([AC_LANG_SOURCE([
 322 #include <sys/mman.h>
 323 #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
 324   #error no MAP_ANONYMOUS
 325 #endif
 326 ])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
 327 fi
 328 AC_SUBST(VIEW_FILE)
 329 AC_SUBST(ALLOC_FILE)
 330
 331 BACKTRACE_USES_MALLOC=0
 332 if test "$ALLOC_FILE" = "alloc.lo"; then
 333   BACKTRACE_USES_MALLOC=1
 334 fi
 335 AC_SUBST(BACKTRACE_USES_MALLOC)
 336
 337 # Check for dl_iterate_phdr.
 338 AC_CHECK_HEADERS(link.h)
 339 if test "$ac_cv_header_link_h" = "no"; then
 340   have_dl_iterate_phdr=no
 341 else
 342   if test -n "${with_target_subdir}"; then
 343     # When built as a GCC target library, we can't do a link test.
 344     AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
 345                     [have_dl_iterate_phdr=no])
 346   else
 347     AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes],
 348                   [have_dl_iterate_phdr=no])
 349   fi
 350 fi
 351 if test "$have_dl_iterate_phdr" = "yes"; then
 352   AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.])
 353 fi
 354
 355 # Check for header file for Mach-O image functions.
 356 AC_CHECK_HEADERS(mach-o/dyld.h)
 357
 358 # Check for loadquery.
 359 AC_CHECK_HEADERS(sys/ldr.h)
 360 if test "$ac_cv_header_sys_ldr_h" = "no"; then
 361   have_loadquery=no
 362 else
 363   if test -n "${with_target_subdir}"; then
 364     # When built as a GCC target library, we can't do a link test.
 365     AC_EGREP_HEADER([loadquery], [sys/ldr.h], [have_loadquery=yes],
 366                     [have_loadquery=no])
 367   else
 368     AC_CHECK_FUNC([loadquery], [have_loadquery=yes],
 369                   [have_loadquery=no])
 370   fi
 371 fi
 372 if test "$have_loadquery" = "yes"; then
 373   AC_DEFINE(HAVE_LOADQUERY, 1, [Define if AIX loadquery is available.])
 374 fi
 375
 376 # Check for the fcntl function.
 377 if test -n "${with_target_subdir}"; then
 378    case "${host}" in
 379    *-*-mingw*) have_fcntl=no ;;
 380    *) have_fcntl=yes ;;
 381    esac
 382 else
 383   AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
 384 fi
 385 if test "$have_fcntl" = "yes"; then
 386   AC_DEFINE([HAVE_FCNTL], 1,
 387             [Define to 1 if you have the fcntl function])
 388 fi
 389
 390 AC_CHECK_DECLS([strnlen, getpagesize])
 391 AC_CHECK_FUNCS(lstat readlink)
 392
 393 # Check for getexecname function.
 394 if test -n "${with_target_subdir}"; then
 395    case "${host}" in
 396    *-*-solaris2*) have_getexecname=yes ;;
 397    *) have_getexecname=no ;;
 398    esac
 399 else
 400   AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
 401 fi
 402 if test "$have_getexecname" = "yes"; then
 403   AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.])
 404 fi
 405
 406 # Check for sysctl definitions.
 407
 408 AC_CACHE_CHECK([for KERN_PROC],
 409 [libbacktrace_cv_proc],
 410 [AC_COMPILE_IFELSE(
 411   [AC_LANG_PROGRAM([
 412 #include <sys/types.h>
 413 #include <sys/sysctl.h>
 414 ], [int mib0 = CTL_KERN; int mib1 = KERN_PROC; int mib2 = KERN_PROC_PATHNAME;])],
 415   [libbacktrace_cv_proc=yes],
 416   [libbacktrace_cv_proc=no])])
 417 if test "$libbacktrace_cv_proc" = "yes"; then
 418   AC_DEFINE([HAVE_KERN_PROC], 1,
 419             [Define to 1 if you have KERN_PROC and KERN_PROC_PATHNAME in <sys/sysctl.h>.])
 420 fi
 421
 422 AC_CACHE_CHECK([for KERN_PROG_ARGS],
 423 [libbacktrace_cv_procargs],
 424 [AC_COMPILE_IFELSE(
 425   [AC_LANG_PROGRAM([
 426 #include <sys/types.h>
 427 #include <sys/sysctl.h>
 428 ], [int mib0 = CTL_KERN; int mib1 = KERN_PROC_ARGS; int mib2 = KERN_PROC_PATHNAME;])],
 429   [libbacktrace_cv_procargs=yes],
 430   [libbacktrace_cv_procargs=no])])
 431 if test "$libbacktrace_cv_procargs" = "yes"; then
 432   AC_DEFINE([HAVE_KERN_PROC_ARGS], 1,
 433             [Define to 1 if you have KERN_PROCARGS and KERN_PROC_PATHNAME in <sys/sysctl.h>.])
 434 fi
 435
 436 # Check for the clock_gettime function.
 437 AC_CHECK_FUNCS(clock_gettime)
 438 clock_gettime_link=
 439 # At least for glibc, clock_gettime is in librt.  But don't
 440 # pull that in if it still doesn't give us the function we want.  This
 441 # test is copied from libgomp, and modified to not link in -lrt as
 442 # we're using this for test timing only.
 443 if test "$ac_cv_func_clock_gettime" = no; then
 444   AC_CHECK_LIB(rt, clock_gettime,
 445     [CLOCK_GETTIME_LINK=-lrt
 446      AC_DEFINE(HAVE_CLOCK_GETTIME, 1,
 447                [Define to 1 if you have the `clock_gettime' function.])])
 448 fi
 449 AC_SUBST(CLOCK_GETTIME_LINK)
 450
 451 dnl Test whether the compiler supports the -pthread option.
 452 AC_CACHE_CHECK([whether -pthread is supported],
 453 [libgo_cv_lib_pthread],
 454 [CFLAGS_hold=$CFLAGS
 455 CFLAGS="$CFLAGS -pthread"
 456 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 457 [libgo_cv_lib_pthread=yes],
 458 [libgo_cv_lib_pthread=no])
 459 CFLAGS=$CFLAGS_hold])
 460 PTHREAD_CFLAGS=
 461 if test "$libgo_cv_lib_pthread" = yes; then
 462   PTHREAD_CFLAGS=-pthread
 463 fi
 464 AC_SUBST(PTHREAD_CFLAGS)
 465
 466 AM_CONDITIONAL(HAVE_PTHREAD, test "$libgo_cv_lib_pthread" = yes)
 467
 468 dnl Test whether the compiler supports the -gdwarf-5 option.
 469 AC_CACHE_CHECK([whether -gdwarf-5 is supported],
 470 [libbacktrace_cv_lib_dwarf5],
 471 [CFLAGS_hold=$CFLAGS
 472 CFLAGS="$CFLAGS -gdwarf-5"
 473 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 474 [libbacktrace_cv_lib_dwarf5=yes],
 475 [libbacktrace_cv_lib_dwarf5=no])
 476 CFLAGS=$CFLAGS_hold])
 477 AM_CONDITIONAL(HAVE_DWARF5, test "$libbacktrace_cv_lib_dwarf5" = yes)
 478
 479 AC_CHECK_LIB([z], [compress],
 480     [AC_DEFINE(HAVE_ZLIB, 1, [Define if -lz is available.])])
 481 AM_CONDITIONAL(HAVE_ZLIB, test "$ac_cv_lib_z_compress" = yes)
 482
 483 dnl Test whether the linker supports the --compress_debug_sections option.
 484 AC_CACHE_CHECK([whether --compress-debug-sections is supported],
 485 [libgo_cv_ld_compress],
 486 [LDFLAGS_hold=$LDFLAGS
 487 LDFLAGS="$LDFLAGS -Wl,--compress-debug-sections=zlib-gnu"
 488 AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
 489 [libgo_cv_ld_compress=yes],
 490 [libgo_cv_ld_compress=no])
 491 LDFLAGS=$LDFLAGS_hold])
 492 AM_CONDITIONAL(HAVE_COMPRESSED_DEBUG, test "$libgo_cv_ld_compress" = yes)
 493
 494 AC_ARG_VAR(OBJCOPY, [location of objcopy])
 495 AC_CHECK_PROG(OBJCOPY, objcopy, objcopy,)
 496 AC_CHECK_PROG(READELF, readelf, readelf)
 497 AC_CACHE_CHECK([whether objcopy supports debuglink],
 498 [libbacktrace_cv_objcopy_debuglink],
 499 [if test -n "${with_target_subdir}"; then
 500   libbacktrace_cv_objcopy_debuglink=no
 501 elif ! test -n "${OBJCOPY}"; then
 502   libbacktrace_cv_objcopy_debuglink=no
 503 elif ${OBJCOPY} --add-gnu-debuglink=x /bin/ls /tmp/ls$$; then
 504   rm -f /tmp/ls$$
 505   libbacktrace_cv_objcopy_debuglink=yes
 506 else
 507   libbacktrace_cv_objcopy_debuglink=no
 508 fi])
 509 AM_CONDITIONAL(HAVE_OBJCOPY_DEBUGLINK, test "$libbacktrace_cv_objcopy_debuglink" = yes)
 510
 511 AC_ARG_VAR(DSYMUTIL, [location of dsymutil])
 512 AC_CHECK_PROG(DSYMUTIL, dsymutil, dsymutil)
 513 AM_CONDITIONAL(HAVE_DSYMUTIL, test -n "${DSYMUTIL}")
 514
 515 AC_CACHE_CHECK([whether tests can run],
 516   [libbacktrace_cv_sys_native],
 517   [AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
 518      [libbacktrace_cv_sys_native=yes],
 519      [libbacktrace_cv_sys_native=no],
 520      [libbacktrace_cv_sys_native=no])])
 521 AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes")
 522
 523 if test "${multilib}" = "yes"; then
 524   multilib_arg="--enable-multilib"
 525 else
 526   multilib_arg=
 527 fi
 528
 529 AC_CONFIG_FILES(Makefile backtrace-supported.h)
 530 AC_CONFIG_FILES(install-debuginfo-for-buildid.sh, chmod +x install-debuginfo-for-buildid.sh)
 531
 532 # We need multilib support, but only if configuring for the target.
 533 AC_CONFIG_COMMANDS([default],
 534 [if test -n "$CONFIG_FILES"; then
 535    if test -n "${with_target_subdir}"; then
 536      # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
 537      # that multilib installs will end up installed in the correct place.
 538      # The testsuite needs it for multilib-aware ABI baseline files.
 539      # To work around this not being passed down from config-ml.in ->
 540      # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
 541      # append it here.  Only modify Makefiles that have just been created.
 542      #
 543      # Also, get rid of this simulated-VPATH thing that automake does.
 544      cat > vpsed << \_EOF
 545   s!`test -f '$<' || echo '$(srcdir)/'`!!
 546 _EOF
 547      for i in $SUBDIRS; do
 548       case $CONFIG_FILES in
 549        *${i}/Makefile*)
 550          #echo "Adding MULTISUBDIR to $i/Makefile"
 551          sed -f vpsed $i/Makefile > tmp
 552          grep '^MULTISUBDIR =' Makefile >> tmp
 553          mv tmp $i/Makefile
 554          ;;
 555       esac
 556      done
 557      rm vpsed
 558    fi
 559  fi
 560 ],
 561 [
 562 # Variables needed in config.status (file generation) which aren't already
 563 # passed by autoconf.
 564 SUBDIRS="$SUBDIRS"
 565 ])
 566
 567 AC_OUTPUT