[thirdparty/gcc.git] / libbacktrace / configure.ac

# configure.ac -- Backtrace configure script.
# Copyright (C) 2012-2016 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)

if test -n "${with_target_subdir}"; then
  AM_ENABLE_MULTILIB(, ..)
fi

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
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.
  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="$CFLAGS -Werror-implicit-function-declaration"
  AC_MSG_CHECKING([for _Unwind_GetIPInfo])
  AC_LINK_IFELSE(
    [AC_LANG_PROGRAM(
       [#include "unwind.h"
	struct _Unwind_Context *context;
	int ip_before_insn = 0;],
	[return _Unwind_GetIPInfo (context, &ip_before_insn);])],
	[have_unwind_getipinfo=yes], [have_unwind_getipinfo=no])
  CFLAGS="$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

# Enable --enable-host-shared.
AC_ARG_ENABLE(host-shared,
[AS_HELP_STRING([--enable-host-shared],
		[build host code as shared libraries])],
[PIC_FLAG=-fPIC], [PIC_FLAG=])
AC_SUBST(PIC_FLAG)

# Test for __sync support.
AC_CACHE_CHECK([__sync extensions],
[libbacktrace_cv_sys_sync],
[if test -n "${with_target_subdir}"; then
   case "${host}" in
   hppa*-*-hpux*) libbacktrace_cv_sys_sync=no ;;
   *) libbacktrace_cv_sys_sync=yes ;;
   esac
 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)

# Test for __atomic support.
AC_CACHE_CHECK([__atomic extensions],
[libbacktrace_cv_sys_atomic],
[if test -n "${with_target_subdir}"; then
   libbacktrace_cv_sys_atomic=yes
 else
   AC_LINK_IFELSE(
     [AC_LANG_PROGRAM([int i;],
     		      [__atomic_load_n (&i, __ATOMIC_ACQUIRE);
		       __atomic_store_n (&i, 1, __ATOMIC_RELEASE);])],
     [libbacktrace_cv_sys_atomic=yes],
     [libbacktrace_cv_sys_atomic=no])
 fi])
if test "$libbacktrace_cv_sys_atomic" = "yes"; then
  AC_DEFINE([HAVE_ATOMIC_FUNCTIONS], 1,
	    [Define to 1 if you have the __atomic functions])
fi

# 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=
backtrace_supports_data=yes
case "$libbacktrace_cv_sys_filetype" in
elf*) FORMAT_FILE="elf.lo" ;;
pecoff) FORMAT_FILE="pecoff.lo"
        backtrace_supports_data=no
	;;
*) 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 "$libbacktrace_cv_sys_filetype" in
elf32) elfsize=32 ;;
elf64) elfsize=64 ;;
*)     elfsize=unused
esac
AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])

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

BACKTRACE_SUPPORTS_DATA=0
if test "$backtrace_supports_data" = "yes"; then
  BACKTRACE_SUPPORTS_DATA=1
fi
AC_SUBST(BACKTRACE_SUPPORTS_DATA)

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
    case "${host}" in
    spu-*-*|*-*-msdosdjgpp)
        # The SPU does not have mmap, but it has a sys/mman.h header file
        # containing "mmap_eaddr" and the mmap flags, confusing the test.
        # DJGPP also has sys/man.h, but no mmap
	have_mmap=no ;;
    esac
  else
    AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
  fi
fi
if test "$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 ;;
   spu-*-*) 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.
818ab71a	2	# Copyright (C) 2012-2016 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
405a6b1c MK	37	if test -n "${with_target_subdir}"; then
	38	AM_ENABLE_MULTILIB(, ..)
	39	fi
	40
eff02e4f ILT	41	AC_CANONICAL_SYSTEM
	42	target_alias=${target_alias-$host_alias}
	43
d4c059d5 ILT	44	AC_USE_SYSTEM_EXTENSIONS
d4c059d5 ILT	45
eff02e4f ILT	46	libtool_VERSION=1:0:0
	47	AC_SUBST(libtool_VERSION)
	48
af710874 ILT	49	# 1.11.1: Require that version of automake.
	50	# foreign: Don't require README, INSTALL, NEWS, etc.
	51	# no-define: Don't define PACKAGE and VERSION.
	52	# no-dependencies: Don't generate automatic dependencies.
	53	# (because it breaks when using bootstrap-lean, since some of the
	54	# headers are gone at "make install" time).
	55	# -Wall: Issue all automake warnings.
	56	# -Wno-portability: Don't warn about constructs supported by GNU make.
	57	# (because GCC requires GNU make anyhow).
	58	AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability])
eff02e4f ILT	59
	60	AM_MAINTAINER_MODE
	61
	62	AC_ARG_WITH(target-subdir,
	63	[ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
	64
	65	# We must force CC to /not/ be precious variables; otherwise
	66	# the wrong, non-multilib-adjusted value will be used in multilibs.
	67	# As a side effect, we have to subst CFLAGS ourselves.
	68	m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS])
	69	m4_define([_AC_ARG_VAR_PRECIOUS],[])
	70	AC_PROG_CC
	71	m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
	72
	73	AC_SUBST(CFLAGS)
	74
	75	AC_PROG_RANLIB
	76
	77	AC_PROG_AWK
	78	case "$AWK" in
	79	"") AC_MSG_ERROR([can't build without awk]) ;;
	80	esac
	81
7e5c7547	82	LT_INIT
eff02e4f ILT	83	AM_PROG_LIBTOOL
	84
	85	backtrace_supported=yes
	86
	87	if test -n "${with_target_subdir}"; then
	88	# We are compiling a GCC library. We can assume that the unwind
	89	# library exists.
eff02e4f ILT	90	BACKTRACE_FILE="backtrace.lo simple.lo"
	91	else
	92	AC_CHECK_HEADER([unwind.h],
	93	[AC_CHECK_FUNC([_Unwind_Backtrace],
	94	[BACKTRACE_FILE="backtrace.lo simple.lo"],
	95	[BACKTRACE_FILE="nounwind.lo"
	96	backtrace_supported=no])],
	97	[BACKTRACE_FILE="nounwind.lo"
	98	backtrace_supported=no])
	99	fi
	100	AC_SUBST(BACKTRACE_FILE)
	101
56195009	102	EXTRA_FLAGS=
32061319	103	if test -n "${with_target_subdir}"; then
36a58fb3	104	EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@"
32061319 ILT	105	else
	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="$CFLAGS_hold"])
36a58fb3 JJ	115	if test "$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="$EXTRA_FLAGS -frandom-seed=\$@"
	129	fi
56195009 UB	130	fi
	131	AC_SUBST(EXTRA_FLAGS)
	132
eff02e4f ILT	133	ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
	134	-Wmissing-prototypes -Wold-style-definition \
	135	-Wmissing-format-attribute -Wcast-qual],
	136	[WARN_FLAGS])
	137
73c3ed27	138	if test -n "${with_target_subdir}"; then
eff02e4f ILT	139	WARN_FLAGS="$WARN_FLAGS -Werror"
	140	fi
	141
	142	AC_SUBST(WARN_FLAGS)
	143
64b89453 ILT	144	if test -n "${with_target_subdir}"; then
	145	GCC_CHECK_UNWIND_GETIPINFO
	146	else
385710cf JH	147	ac_save_CFFLAGS="$CFLAGS"
	148	CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
	149	AC_MSG_CHECKING([for _Unwind_GetIPInfo])
63fefb4b	150	AC_LINK_IFELSE(
385710cf JH	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])
64b89453 ILT	159	if test "$have_unwind_getipinfo" = "yes"; then
	160	AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
	161	fi
	162	fi
eff02e4f	163
7e5c7547	164	# Enable --enable-host-shared.
459260ec DM	165	AC_ARG_ENABLE(host-shared,
	166	[AS_HELP_STRING([--enable-host-shared],
	167	[build host code as shared libraries])],
7e5c7547	168	[PIC_FLAG=-fPIC], [PIC_FLAG=])
eff02e4f ILT	169	AC_SUBST(PIC_FLAG)
	170
	171	# Test for __sync support.
	172	AC_CACHE_CHECK([__sync extensions],
	173	[libbacktrace_cv_sys_sync],
	174	[if test -n "${with_target_subdir}"; then
2f401a8f JDA	175	case "${host}" in
	176	hppa--hpux*) libbacktrace_cv_sys_sync=no ;;
	177	*) libbacktrace_cv_sys_sync=yes ;;
	178	esac
eff02e4f ILT	179	else
	180	AC_LINK_IFELSE(
	181	[AC_LANG_PROGRAM([int i;],
	182	[__sync_bool_compare_and_swap (&i, i, i);
	183	__sync_lock_test_and_set (&i, 1);
	184	__sync_lock_release (&i);])],
	185	[libbacktrace_cv_sys_sync=yes],
	186	[libbacktrace_cv_sys_sync=no])
	187	fi])
	188	BACKTRACE_SUPPORTS_THREADS=0
	189	if test "$libbacktrace_cv_sys_sync" = "yes"; then
	190	BACKTRACE_SUPPORTS_THREADS=1
	191	AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1,
	192	[Define to 1 if you have the __sync functions])
	193	fi
	194	AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
	195
49579c7e ILT	196	# Test for __atomic support.
	197	AC_CACHE_CHECK([__atomic extensions],
	198	[libbacktrace_cv_sys_atomic],
	199	[if test -n "${with_target_subdir}"; then
	200	libbacktrace_cv_sys_atomic=yes
	201	else
	202	AC_LINK_IFELSE(
	203	[AC_LANG_PROGRAM([int i;],
	204	[__atomic_load_n (&i, __ATOMIC_ACQUIRE);
	205	__atomic_store_n (&i, 1, __ATOMIC_RELEASE);])],
	206	[libbacktrace_cv_sys_atomic=yes],
	207	[libbacktrace_cv_sys_atomic=no])
	208	fi])
	209	if test "$libbacktrace_cv_sys_atomic" = "yes"; then
	210	AC_DEFINE([HAVE_ATOMIC_FUNCTIONS], 1,
	211	[Define to 1 if you have the __atomic functions])
	212	fi
	213
eff02e4f ILT	214	# The library needs to be able to read the executable itself. Compile
	215	# a file to determine the executable format. The awk script
	216	# filetype.awk prints out the file type.
	217	AC_CACHE_CHECK([output filetype],
	218	[libbacktrace_cv_sys_filetype],
	219	[filetype=
	220	AC_COMPILE_IFELSE(
	221	[AC_LANG_PROGRAM([int i;], [int j;])],
	222	[filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`],
	223	[AC_MSG_FAILURE([compiler failed])])
	224	libbacktrace_cv_sys_filetype=$filetype])
	225
	226	# Match the file type to decide what files to compile.
	227	FORMAT_FILE=
e24afc10	228	backtrace_supports_data=yes
eff02e4f ILT	229	case "$libbacktrace_cv_sys_filetype" in
eff02e4f ILT	230	elf*) FORMAT_FILE="elf.lo" ;;
e24afc10 TG	231	pecoff) FORMAT_FILE="pecoff.lo"
	232	backtrace_supports_data=no
	233	;;
eff02e4f ILT	234	*) AC_MSG_WARN([could not determine output file type])
	235	FORMAT_FILE="unknown.lo"
	236	backtrace_supported=no
	237	;;
	238	esac
	239	AC_SUBST(FORMAT_FILE)
	240
	241	# ELF defines.
	242	elfsize=
	243	case "$libbacktrace_cv_sys_filetype" in
	244	elf32) elfsize=32 ;;
	245	elf64) elfsize=64 ;;
e24afc10	246	*) elfsize=unused
eff02e4f ILT	247	esac
	248	AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])
	249
	250	BACKTRACE_SUPPORTED=0
	251	if test "$backtrace_supported" = "yes"; then
	252	BACKTRACE_SUPPORTED=1
	253	fi
	254	AC_SUBST(BACKTRACE_SUPPORTED)
	255
e24afc10 TG	256	BACKTRACE_SUPPORTS_DATA=0
	257	if test "$backtrace_supports_data" = "yes"; then
	258	BACKTRACE_SUPPORTS_DATA=1
	259	fi
	260	AC_SUBST(BACKTRACE_SUPPORTS_DATA)
	261
76850556 RO	262	GCC_HEADER_STDINT(gstdint.h)
76850556 RO	263
eff02e4f ILT	264	AC_CHECK_HEADERS(sys/mman.h)
	265	if test "$ac_cv_header_sys_mman_h" = "no"; then
	266	have_mmap=no
	267	else
	268	if test -n "${with_target_subdir}"; then
	269	# When built as a GCC target library, we can't do a link test. We
	270	# simply assume that if we have mman.h, we have mmap.
	271	have_mmap=yes
1b533361	272	case "${host}" in
5b4bbc7d	273	spu--\|--msdosdjgpp)
1b533361 UW	274	# The SPU does not have mmap, but it has a sys/mman.h header file
1b533361 UW	275	# containing "mmap_eaddr" and the mmap flags, confusing the test.
5b4bbc7d	276	# DJGPP also has sys/man.h, but no mmap
1b533361 UW	277	have_mmap=no ;;
1b533361 UW	278	esac
eff02e4f ILT	279	else
	280	AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
	281	fi
	282	fi
	283	if test "$have_mmap" = "no"; then
	284	VIEW_FILE=read.lo
	285	ALLOC_FILE=alloc.lo
	286	else
	287	VIEW_FILE=mmapio.lo
	288	AC_PREPROC_IFELSE([
	289	#include <sys/mman.h>
	290	#if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
	291	#error no MAP_ANONYMOUS
	292	#endif
	293	], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
	294	fi
	295	AC_SUBST(VIEW_FILE)
	296	AC_SUBST(ALLOC_FILE)
	297
	298	BACKTRACE_USES_MALLOC=0
	299	if test "$ALLOC_FILE" = "alloc.lo"; then
	300	BACKTRACE_USES_MALLOC=1
	301	fi
	302	AC_SUBST(BACKTRACE_USES_MALLOC)
	303
e561a992 ILT	304	# Check for dl_iterate_phdr.
	305	AC_CHECK_HEADERS(link.h)
	306	if test "$ac_cv_header_link_h" = "no"; then
	307	have_dl_iterate_phdr=no
	308	else
	309	if test -n "${with_target_subdir}"; then
	310	# When built as a GCC target library, we can't do a link test.
	311	AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
	312	[have_dl_iterate_phdr=no])
5551b12c ILT	313	case "${host}" in
	314	--solaris2.10*)
	315	# Avoid dl_iterate_phdr on Solaris 10, where it is in the
	316	# header file but is only in -ldl.
	317	have_dl_iterate_phdr=no ;;
	318	esac
e561a992 ILT	319	else
	320	AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes],
	321	[have_dl_iterate_phdr=no])
	322	fi
	323	fi
	324	if test "$have_dl_iterate_phdr" = "yes"; then
	325	AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.])
	326	fi
	327
3319ef17 ILT	328	# Check for the fcntl function.
	329	if test -n "${with_target_subdir}"; then
	330	case "${host}" in
	331	--mingw*) have_fcntl=no ;;
8f5027bf	332	spu--) have_fcntl=no ;;
3319ef17 ILT	333	*) have_fcntl=yes ;;
	334	esac
	335	else
	336	AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
	337	fi
	338	if test "$have_fcntl" = "yes"; then
	339	AC_DEFINE([HAVE_FCNTL], 1,
	340	[Define to 1 if you have the fcntl function])
	341	fi
	342
772a71a9 ILT	343	AC_CHECK_DECLS(strnlen)
772a71a9 ILT	344
33521509 ILT	345	# Check for getexecname function.
	346	if test -n "${with_target_subdir}"; then
	347	case "${host}" in
	348	--solaris2*) have_getexecname=yes ;;
	349	*) have_getexecname=no ;;
	350	esac
	351	else
	352	AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
	353	fi
	354	if test "$have_getexecname" = "yes"; then
	355	AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.])
	356	fi
	357
eff02e4f ILT	358	AC_CACHE_CHECK([whether tests can run],
	359	[libbacktrace_cv_sys_native],
	360	[AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
	361	[libbacktrace_cv_sys_native=yes],
	362	[libbacktrace_cv_sys_native=no],
	363	[libbacktrace_cv_sys_native=no])])
	364	AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes")
	365
	366	if test "${multilib}" = "yes"; then
	367	multilib_arg="--enable-multilib"
	368	else
	369	multilib_arg=
	370	fi
	371
	372	AC_CONFIG_FILES(Makefile backtrace-supported.h)
	373
	374	# We need multilib support, but only if configuring for the target.
	375	AC_CONFIG_COMMANDS([default],
	376	[if test -n "$CONFIG_FILES"; then
	377	if test -n "${with_target_subdir}"; then
	378	# Multilibs need MULTISUBDIR defined correctly in certain makefiles so
	379	# that multilib installs will end up installed in the correct place.
	380	# The testsuite needs it for multilib-aware ABI baseline files.
	381	# To work around this not being passed down from config-ml.in ->
	382	# srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
	383	# append it here. Only modify Makefiles that have just been created.
	384	#
	385	# Also, get rid of this simulated-VPATH thing that automake does.
	386	cat > vpsed << \_EOF
	387	s!`test -f '$<' \|\| echo '$(srcdir)/'`!!
	388	_EOF
	389	for i in $SUBDIRS; do
	390	case $CONFIG_FILES in
	391	${i}/Makefile)
	392	#echo "Adding MULTISUBDIR to $i/Makefile"
	393	sed -f vpsed $i/Makefile > tmp
	394	grep '^MULTISUBDIR =' Makefile >> tmp
	395	mv tmp $i/Makefile
	396	;;
	397	esac
	398	done
	399	rm vpsed
	400	fi
	401	fi
	402	],
	403	[
	404	# Variables needed in config.status (file generation) which aren't already
	405	# passed by autoconf.
	406	SUBDIRS="$SUBDIRS"
	407	])
	408
	409	AC_OUTPUT