[gcc.git] / libbacktrace / configure.ac

# configure.ac -- Backtrace configure script.
# Copyright (C) 2012-2013 Free Software Foundation, Inc.

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:

#     (1) Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer. 

#     (2) Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
#     distribution.  
    
#     (3) The name of the author may not be used to
#     endorse or promote products derived from this software without
#     specific prior written permission.

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

AC_PREREQ(2.64)
AC_INIT(package-unused, version-unused,, libbacktrace)
AC_CONFIG_SRCDIR(backtrace.h)
AC_CONFIG_HEADER(config.h)

AC_CANONICAL_SYSTEM
target_alias=${target_alias-$host_alias}

AC_USE_SYSTEM_EXTENSIONS

libtool_VERSION=1:0:0
AC_SUBST(libtool_VERSION)

# 1.11.1: Require that version of automake.
# foreign: Don't require README, INSTALL, NEWS, etc.
# no-define: Don't define PACKAGE and VERSION.
# no-dependencies: Don't generate automatic dependencies.
#    (because it breaks when using bootstrap-lean, since some of the
#    headers are gone at "make install" time).
# -Wall: Issue all automake warnings.
# -Wno-portability: Don't warn about constructs supported by GNU make.
#    (because GCC requires GNU make anyhow).
AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability])

AM_MAINTAINER_MODE

AC_ARG_WITH(target-subdir,
[  --with-target-subdir=SUBDIR      Configuring in a subdirectory for target])

# We must force CC to /not/ be precious variables; otherwise
# the wrong, non-multilib-adjusted value will be used in multilibs.
# As a side effect, we have to subst CFLAGS ourselves.
m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS])
m4_define([_AC_ARG_VAR_PRECIOUS],[])
AC_PROG_CC
m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

AC_SUBST(CFLAGS)

AC_PROG_RANLIB

AC_PROG_AWK
case "$AWK" in
"") AC_MSG_ERROR([can't build without awk]) ;;
esac

LT_INIT([disable-shared])
AM_PROG_LIBTOOL

backtrace_supported=yes

if test -n "${with_target_subdir}"; then
  # We are compiling a GCC library.  We can assume that the unwind
  # library exists.
  AM_ENABLE_MULTILIB(, ..)
  BACKTRACE_FILE="backtrace.lo simple.lo"
else
  AC_CHECK_HEADER([unwind.h],
    [AC_CHECK_FUNC([_Unwind_Backtrace],
	           [BACKTRACE_FILE="backtrace.lo simple.lo"],
		   [BACKTRACE_FILE="nounwind.lo"
                    backtrace_supported=no])],
    [BACKTRACE_FILE="nounwind.lo"
     backtrace_supported=no])
fi
AC_SUBST(BACKTRACE_FILE)

EXTRA_FLAGS=
if test -n "${with_target_subdir}"; then
  EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@"
else
  AC_CACHE_CHECK([for -funwind-tables option],
    [libbacktrace_cv_c_unwind_tables],
    [CFLAGS_hold="$CFLAGS"
     CFLAGS="$CFLAGS -funwind-tables"
     AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM([static int f() { return 0; }], [return f();])],
       [libbacktrace_cv_c_unwind_tables=yes],
       [libbacktrace_cv_c_unwind_tables=no])
     CFLAGS="$CFLAGS_hold"])
  if test "$libbacktrace_cv_c_unwind_tables" = "yes"; then
    EXTRA_FLAGS=-funwind-tables
  fi
  AC_CACHE_CHECK([for -frandom-seed=string option],
    [libbacktrace_cv_c_random_seed_string],
    [CFLAGS_hold="$CFLAGS"
     CFLAGS="$CFLAGS -frandom-seed=conftest.lo"
     AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM([], [return 0;])],
       [libbacktrace_cv_c_random_seed_string=yes],
       [libbacktrace_cv_c_random_seed_string=no])
     CFLAGS="$CFLAGS_hold"])
  if test "$libbacktrace_cv_c_random_seed_string" = "yes"; then
    EXTRA_FLAGS="$EXTRA_FLAGS -frandom-seed=\$@"
  fi
fi
AC_SUBST(EXTRA_FLAGS)

ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
			  -Wmissing-prototypes -Wold-style-definition \
			  -Wmissing-format-attribute -Wcast-qual],
			  [WARN_FLAGS])

if test -n "${with_target_subdir}"; then
  WARN_FLAGS="$WARN_FLAGS -Werror"
fi

AC_SUBST(WARN_FLAGS)

if test -n "${with_target_subdir}"; then
  GCC_CHECK_UNWIND_GETIPINFO
else
  ac_save_CFFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
  AC_MSG_CHECKING([for _Unwind_GetIPInfo])
  AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
       [#include "unwind.h"
	struct _Unwind_Context *context;
	int ip_before_insn = 0;],
	[return _Unwind_GetIPInfo (context, &ip_before_insn);])],
	[have_unwind_getipinfo=yes], [have_unwind_getipinfo=no])
  CFLAGS="$ac_save_CFLAGS"
  AC_MSG_RESULT([$have_unwind_getipinfo])
  if test "$have_unwind_getipinfo" = "yes"; then
    AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
  fi
fi

# When building as a target library, shared libraries may want to link
# this in.  We don't want to provide another shared library to
# complicate dependencies.  Instead, we just compile with -fPIC.
PIC_FLAG=
if test -n "${with_target_subdir}"; then
  PIC_FLAG=-fPIC
fi
AC_SUBST(PIC_FLAG)

# Test for __sync support.
AC_CACHE_CHECK([__sync extensions],
[libbacktrace_cv_sys_sync],
[if test -n "${with_target_subdir}"; then
   libbacktrace_cv_sys_sync=yes
 else
   AC_LINK_IFELSE(
     [AC_LANG_PROGRAM([int i;],
                      [__sync_bool_compare_and_swap (&i, i, i);
                       __sync_lock_test_and_set (&i, 1);
                       __sync_lock_release (&i);])],
     [libbacktrace_cv_sys_sync=yes],
     [libbacktrace_cv_sys_sync=no])
 fi])
BACKTRACE_SUPPORTS_THREADS=0
if test "$libbacktrace_cv_sys_sync" = "yes"; then
  BACKTRACE_SUPPORTS_THREADS=1
  AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1,
	    [Define to 1 if you have the __sync functions])
fi
AC_SUBST(BACKTRACE_SUPPORTS_THREADS)

# The library needs to be able to read the executable itself.  Compile
# a file to determine the executable format.  The awk script
# filetype.awk prints out the file type.
AC_CACHE_CHECK([output filetype],
[libbacktrace_cv_sys_filetype],
[filetype=
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([int i;], [int j;])],
  [filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`],
  [AC_MSG_FAILURE([compiler failed])])
libbacktrace_cv_sys_filetype=$filetype])

# Match the file type to decide what files to compile.
FORMAT_FILE=
case "$libbacktrace_cv_sys_filetype" in
elf*) FORMAT_FILE="elf.lo" ;;
*) AC_MSG_WARN([could not determine output file type])
   FORMAT_FILE="unknown.lo"
   backtrace_supported=no
   ;;
esac
AC_SUBST(FORMAT_FILE)

# ELF defines.
elfsize=
case "$libbacktrace_cv_sys_filetype" in
elf32) elfsize=32 ;;
elf64) elfsize=64 ;;
esac
AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])

BACKTRACE_SUPPORTED=0
if test "$backtrace_supported" = "yes"; then
  BACKTRACE_SUPPORTED=1
fi
AC_SUBST(BACKTRACE_SUPPORTED)

GCC_HEADER_STDINT(gstdint.h)

AC_CHECK_HEADERS(sys/mman.h)
if test "$ac_cv_header_sys_mman_h" = "no"; then
  have_mmap=no
else
  if test -n "${with_target_subdir}"; then
    # When built as a GCC target library, we can't do a link test.  We
    # simply assume that if we have mman.h, we have mmap.
    have_mmap=yes
  else
    AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
  fi
fi
if test "$have_mmap" = "no"; then
  VIEW_FILE=read.lo
  ALLOC_FILE=alloc.lo
else
  VIEW_FILE=mmapio.lo
  AC_PREPROC_IFELSE([
#include <sys/mman.h>
#if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
  #error no MAP_ANONYMOUS
#endif
], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
fi
AC_SUBST(VIEW_FILE)
AC_SUBST(ALLOC_FILE)

BACKTRACE_USES_MALLOC=0
if test "$ALLOC_FILE" = "alloc.lo"; then
  BACKTRACE_USES_MALLOC=1
fi
AC_SUBST(BACKTRACE_USES_MALLOC)

# Check for dl_iterate_phdr.
AC_CHECK_HEADERS(link.h)
if test "$ac_cv_header_link_h" = "no"; then
  have_dl_iterate_phdr=no
else
  if test -n "${with_target_subdir}"; then
    # When built as a GCC target library, we can't do a link test.
    AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
		    [have_dl_iterate_phdr=no])
    case "${host}" in
    *-*-solaris2.10*)
        # Avoid dl_iterate_phdr on Solaris 10, where it is in the
    	# header file but is only in -ldl.
	have_dl_iterate_phdr=no ;;
    esac
  else
    AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes],
		  [have_dl_iterate_phdr=no])
  fi
fi
if test "$have_dl_iterate_phdr" = "yes"; then
  AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.])
fi

# Check for the fcntl function.
if test -n "${with_target_subdir}"; then
   case "${host}" in
   *-*-mingw*) have_fcntl=no ;;
   *) have_fcntl=yes ;;
   esac
else
  AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
fi
if test "$have_fcntl" = "yes"; then
  AC_DEFINE([HAVE_FCNTL], 1,
	    [Define to 1 if you have the fcntl function])
fi

AC_CHECK_DECLS(strnlen)

# Check for getexecname function.
if test -n "${with_target_subdir}"; then
   case "${host}" in
   *-*-solaris2*) have_getexecname=yes ;;
   *) have_getexecname=no ;;
   esac
else
  AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
fi
if test "$have_getexecname" = "yes"; then
  AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.])
fi

AC_CACHE_CHECK([whether tests can run],
  [libbacktrace_cv_sys_native],
  [AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
     [libbacktrace_cv_sys_native=yes],
     [libbacktrace_cv_sys_native=no],
     [libbacktrace_cv_sys_native=no])])
AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes")

if test "${multilib}" = "yes"; then
  multilib_arg="--enable-multilib"
else
  multilib_arg=
fi

AC_CONFIG_FILES(Makefile backtrace-supported.h)

# We need multilib support, but only if configuring for the target.
AC_CONFIG_COMMANDS([default],
[if test -n "$CONFIG_FILES"; then
   if test -n "${with_target_subdir}"; then
     # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
     # that multilib installs will end up installed in the correct place.
     # The testsuite needs it for multilib-aware ABI baseline files.
     # To work around this not being passed down from config-ml.in ->
     # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
     # append it here.  Only modify Makefiles that have just been created.
     #
     # Also, get rid of this simulated-VPATH thing that automake does.
     cat > vpsed << \_EOF
  s!`test -f '$<' || echo '$(srcdir)/'`!!
_EOF
     for i in $SUBDIRS; do
      case $CONFIG_FILES in
       *${i}/Makefile*)
	 #echo "Adding MULTISUBDIR to $i/Makefile"
	 sed -f vpsed $i/Makefile > tmp
	 grep '^MULTISUBDIR =' Makefile >> tmp
	 mv tmp $i/Makefile
	 ;;
      esac
     done
     rm vpsed
   fi
 fi
],
[
# Variables needed in config.status (file generation) which aren't already
# passed by autoconf.
SUBDIRS="$SUBDIRS"
])

AC_OUTPUT
Commit	Line	Data
eff02e4f	1	# configure.ac -- Backtrace configure script.
f8a7e1a4	2	# Copyright (C) 2012-2013 Free Software Foundation, Inc.
eff02e4f ILT	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_PREREQ(2.64)
	33	AC_INIT(package-unused, version-unused,, libbacktrace)
	34	AC_CONFIG_SRCDIR(backtrace.h)
	35	AC_CONFIG_HEADER(config.h)
	36
	37	AC_CANONICAL_SYSTEM
	38	target_alias=${target_alias-$host_alias}
	39
d4c059d5 ILT	40	AC_USE_SYSTEM_EXTENSIONS
d4c059d5 ILT	41
eff02e4f ILT	42	libtool_VERSION=1:0:0
	43	AC_SUBST(libtool_VERSION)
	44
af710874 ILT	45	# 1.11.1: Require that version of automake.
	46	# foreign: Don't require README, INSTALL, NEWS, etc.
	47	# no-define: Don't define PACKAGE and VERSION.
	48	# no-dependencies: Don't generate automatic dependencies.
	49	# (because it breaks when using bootstrap-lean, since some of the
	50	# headers are gone at "make install" time).
	51	# -Wall: Issue all automake warnings.
	52	# -Wno-portability: Don't warn about constructs supported by GNU make.
	53	# (because GCC requires GNU make anyhow).
	54	AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability])
eff02e4f ILT	55
	56	AM_MAINTAINER_MODE
	57
	58	AC_ARG_WITH(target-subdir,
	59	[ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
	60
	61	# We must force CC to /not/ be precious variables; otherwise
	62	# the wrong, non-multilib-adjusted value will be used in multilibs.
	63	# As a side effect, we have to subst CFLAGS ourselves.
	64	m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS])
	65	m4_define([_AC_ARG_VAR_PRECIOUS],[])
	66	AC_PROG_CC
	67	m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
	68
	69	AC_SUBST(CFLAGS)
	70
	71	AC_PROG_RANLIB
	72
	73	AC_PROG_AWK
	74	case "$AWK" in
	75	"") AC_MSG_ERROR([can't build without awk]) ;;
	76	esac
	77
	78	LT_INIT([disable-shared])
	79	AM_PROG_LIBTOOL
	80
	81	backtrace_supported=yes
	82
	83	if test -n "${with_target_subdir}"; then
	84	# We are compiling a GCC library. We can assume that the unwind
	85	# library exists.
	86	AM_ENABLE_MULTILIB(, ..)
	87	BACKTRACE_FILE="backtrace.lo simple.lo"
	88	else
	89	AC_CHECK_HEADER([unwind.h],
	90	[AC_CHECK_FUNC([_Unwind_Backtrace],
	91	[BACKTRACE_FILE="backtrace.lo simple.lo"],
	92	[BACKTRACE_FILE="nounwind.lo"
	93	backtrace_supported=no])],
	94	[BACKTRACE_FILE="nounwind.lo"
	95	backtrace_supported=no])
	96	fi
	97	AC_SUBST(BACKTRACE_FILE)
	98
56195009	99	EXTRA_FLAGS=
32061319	100	if test -n "${with_target_subdir}"; then
36a58fb3	101	EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@"
32061319 ILT	102	else
	103	AC_CACHE_CHECK([for -funwind-tables option],
	104	[libbacktrace_cv_c_unwind_tables],
	105	[CFLAGS_hold="$CFLAGS"
	106	CFLAGS="$CFLAGS -funwind-tables"
	107	AC_COMPILE_IFELSE(
	108	[AC_LANG_PROGRAM([static int f() { return 0; }], [return f();])],
	109	[libbacktrace_cv_c_unwind_tables=yes],
	110	[libbacktrace_cv_c_unwind_tables=no])
	111	CFLAGS="$CFLAGS_hold"])
36a58fb3 JJ	112	if test "$libbacktrace_cv_c_unwind_tables" = "yes"; then
	113	EXTRA_FLAGS=-funwind-tables
	114	fi
	115	AC_CACHE_CHECK([for -frandom-seed=string option],
	116	[libbacktrace_cv_c_random_seed_string],
	117	[CFLAGS_hold="$CFLAGS"
	118	CFLAGS="$CFLAGS -frandom-seed=conftest.lo"
	119	AC_COMPILE_IFELSE(
	120	[AC_LANG_PROGRAM([], [return 0;])],
	121	[libbacktrace_cv_c_random_seed_string=yes],
	122	[libbacktrace_cv_c_random_seed_string=no])
	123	CFLAGS="$CFLAGS_hold"])
	124	if test "$libbacktrace_cv_c_random_seed_string" = "yes"; then
	125	EXTRA_FLAGS="$EXTRA_FLAGS -frandom-seed=\$@"
	126	fi
56195009 UB	127	fi
	128	AC_SUBST(EXTRA_FLAGS)
	129
eff02e4f ILT	130	ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
	131	-Wmissing-prototypes -Wold-style-definition \
	132	-Wmissing-format-attribute -Wcast-qual],
	133	[WARN_FLAGS])
	134
73c3ed27	135	if test -n "${with_target_subdir}"; then
eff02e4f ILT	136	WARN_FLAGS="$WARN_FLAGS -Werror"
	137	fi
	138
	139	AC_SUBST(WARN_FLAGS)
	140
64b89453 ILT	141	if test -n "${with_target_subdir}"; then
	142	GCC_CHECK_UNWIND_GETIPINFO
	143	else
385710cf JH	144	ac_save_CFFLAGS="$CFLAGS"
	145	CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
	146	AC_MSG_CHECKING([for _Unwind_GetIPInfo])
	147	AC_COMPILE_IFELSE(
	148	[AC_LANG_PROGRAM(
	149	[#include "unwind.h"
	150	struct _Unwind_Context *context;
	151	int ip_before_insn = 0;],
	152	[return _Unwind_GetIPInfo (context, &ip_before_insn);])],
	153	[have_unwind_getipinfo=yes], [have_unwind_getipinfo=no])
	154	CFLAGS="$ac_save_CFLAGS"
	155	AC_MSG_RESULT([$have_unwind_getipinfo])
64b89453 ILT	156	if test "$have_unwind_getipinfo" = "yes"; then
	157	AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
	158	fi
	159	fi
eff02e4f ILT	160
	161	# When building as a target library, shared libraries may want to link
	162	# this in. We don't want to provide another shared library to
	163	# complicate dependencies. Instead, we just compile with -fPIC.
	164	PIC_FLAG=
	165	if test -n "${with_target_subdir}"; then
	166	PIC_FLAG=-fPIC
	167	fi
	168	AC_SUBST(PIC_FLAG)
	169
	170	# Test for __sync support.
	171	AC_CACHE_CHECK([__sync extensions],
	172	[libbacktrace_cv_sys_sync],
	173	[if test -n "${with_target_subdir}"; then
	174	libbacktrace_cv_sys_sync=yes
	175	else
	176	AC_LINK_IFELSE(
	177	[AC_LANG_PROGRAM([int i;],
	178	[__sync_bool_compare_and_swap (&i, i, i);
	179	__sync_lock_test_and_set (&i, 1);
	180	__sync_lock_release (&i);])],
	181	[libbacktrace_cv_sys_sync=yes],
	182	[libbacktrace_cv_sys_sync=no])
	183	fi])
	184	BACKTRACE_SUPPORTS_THREADS=0
	185	if test "$libbacktrace_cv_sys_sync" = "yes"; then
	186	BACKTRACE_SUPPORTS_THREADS=1
	187	AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1,
	188	[Define to 1 if you have the __sync functions])
	189	fi
	190	AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
	191
	192	# The library needs to be able to read the executable itself. Compile
	193	# a file to determine the executable format. The awk script
	194	# filetype.awk prints out the file type.
	195	AC_CACHE_CHECK([output filetype],
	196	[libbacktrace_cv_sys_filetype],
	197	[filetype=
	198	AC_COMPILE_IFELSE(
	199	[AC_LANG_PROGRAM([int i;], [int j;])],
	200	[filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`],
	201	[AC_MSG_FAILURE([compiler failed])])
	202	libbacktrace_cv_sys_filetype=$filetype])
	203
	204	# Match the file type to decide what files to compile.
	205	FORMAT_FILE=
	206	case "$libbacktrace_cv_sys_filetype" in
	207	elf*) FORMAT_FILE="elf.lo" ;;
	208	*) AC_MSG_WARN([could not determine output file type])
	209	FORMAT_FILE="unknown.lo"
	210	backtrace_supported=no
	211	;;
	212	esac
	213	AC_SUBST(FORMAT_FILE)
	214
	215	# ELF defines.
	216	elfsize=
	217	case "$libbacktrace_cv_sys_filetype" in
	218	elf32) elfsize=32 ;;
	219	elf64) elfsize=64 ;;
	220	esac
	221	AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])
	222
	223	BACKTRACE_SUPPORTED=0
224	if test "$backtrace_supported" = "yes"; then
225	BACKTRACE_SUPPORTED=1
226	fi
227	AC_SUBST(BACKTRACE_SUPPORTED)
228
76850556 RO	229	GCC_HEADER_STDINT(gstdint.h)
76850556 RO	230
eff02e4f ILT	231	AC_CHECK_HEADERS(sys/mman.h)
	232	if test "$ac_cv_header_sys_mman_h" = "no"; then
	233	have_mmap=no
	234	else
	235	if test -n "${with_target_subdir}"; then
	236	# When built as a GCC target library, we can't do a link test. We
	237	# simply assume that if we have mman.h, we have mmap.
	238	have_mmap=yes
	239	else
	240	AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
	241	fi
	242	fi
	243	if test "$have_mmap" = "no"; then
	244	VIEW_FILE=read.lo
	245	ALLOC_FILE=alloc.lo
	246	else
	247	VIEW_FILE=mmapio.lo
	248	AC_PREPROC_IFELSE([
	249	#include <sys/mman.h>
	250	#if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
	251	#error no MAP_ANONYMOUS
	252	#endif
	253	], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
	254	fi
	255	AC_SUBST(VIEW_FILE)
	256	AC_SUBST(ALLOC_FILE)
	257
	258	BACKTRACE_USES_MALLOC=0
	259	if test "$ALLOC_FILE" = "alloc.lo"; then
	260	BACKTRACE_USES_MALLOC=1
	261	fi
	262	AC_SUBST(BACKTRACE_USES_MALLOC)
	263
e561a992 ILT	264	# Check for dl_iterate_phdr.
	265	AC_CHECK_HEADERS(link.h)
	266	if test "$ac_cv_header_link_h" = "no"; then
	267	have_dl_iterate_phdr=no
	268	else
	269	if test -n "${with_target_subdir}"; then
	270	# When built as a GCC target library, we can't do a link test.
	271	AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
	272	[have_dl_iterate_phdr=no])
5551b12c ILT	273	case "${host}" in
	274	--solaris2.10*)
	275	# Avoid dl_iterate_phdr on Solaris 10, where it is in the
	276	# header file but is only in -ldl.
	277	have_dl_iterate_phdr=no ;;
	278	esac
e561a992 ILT	279	else
	280	AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes],
	281	[have_dl_iterate_phdr=no])
	282	fi
	283	fi
	284	if test "$have_dl_iterate_phdr" = "yes"; then
	285	AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.])
	286	fi
	287
3319ef17 ILT	288	# Check for the fcntl function.
	289	if test -n "${with_target_subdir}"; then
	290	case "${host}" in
	291	--mingw*) have_fcntl=no ;;
	292	*) have_fcntl=yes ;;
	293	esac
	294	else
	295	AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
	296	fi
	297	if test "$have_fcntl" = "yes"; then
	298	AC_DEFINE([HAVE_FCNTL], 1,
	299	[Define to 1 if you have the fcntl function])
	300	fi
	301
772a71a9 ILT	302	AC_CHECK_DECLS(strnlen)
772a71a9 ILT	303
33521509 ILT	304	# Check for getexecname function.
	305	if test -n "${with_target_subdir}"; then
	306	case "${host}" in
	307	--solaris2*) have_getexecname=yes ;;
	308	*) have_getexecname=no ;;
	309	esac
	310	else
	311	AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
	312	fi
	313	if test "$have_getexecname" = "yes"; then
	314	AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.])
	315	fi
	316
eff02e4f ILT	317	AC_CACHE_CHECK([whether tests can run],
	318	[libbacktrace_cv_sys_native],
	319	[AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
	320	[libbacktrace_cv_sys_native=yes],
	321	[libbacktrace_cv_sys_native=no],
	322	[libbacktrace_cv_sys_native=no])])
	323	AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes")
	324
	325	if test "${multilib}" = "yes"; then
	326	multilib_arg="--enable-multilib"
	327	else
	328	multilib_arg=
	329	fi
	330
	331	AC_CONFIG_FILES(Makefile backtrace-supported.h)
	332
	333	# We need multilib support, but only if configuring for the target.
	334	AC_CONFIG_COMMANDS([default],
	335	[if test -n "$CONFIG_FILES"; then
	336	if test -n "${with_target_subdir}"; then
	337	# Multilibs need MULTISUBDIR defined correctly in certain makefiles so
	338	# that multilib installs will end up installed in the correct place.
	339	# The testsuite needs it for multilib-aware ABI baseline files.
	340	# To work around this not being passed down from config-ml.in ->
	341	# srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
	342	# append it here. Only modify Makefiles that have just been created.
	343	#
	344	# Also, get rid of this simulated-VPATH thing that automake does.
	345	cat > vpsed << \_EOF
	346	s!`test -f '$<' \|\| echo '$(srcdir)/'`!!
	347	_EOF
	348	for i in $SUBDIRS; do
	349	case $CONFIG_FILES in
	350	${i}/Makefile)
	351	#echo "Adding MULTISUBDIR to $i/Makefile"
	352	sed -f vpsed $i/Makefile > tmp
	353	grep '^MULTISUBDIR =' Makefile >> tmp
	354	mv tmp $i/Makefile
	355	;;
	356	esac
	357	done
	358	rm vpsed
	359	fi
	360	fi
	361	],
	362	[
	363	# Variables needed in config.status (file generation) which aren't already
	364	# passed by autoconf.
	365	SUBDIRS="$SUBDIRS"
	366	])
	367
	368	AC_OUTPUT