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|
# configure.ac -- Backtrace configure script.
# Copyright (C) 2012 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}
libtool_VERSION=1:0:0
AC_SUBST(libtool_VERSION)
AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define -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)
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 "x$GCC" = "xyes"; then
WARN_FLAGS="$WARN_FLAGS -Werror"
fi
AC_SUBST(WARN_FLAGS)
GCC_CHECK_UNWIND_GETIPINFO
# 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 "$backtrace_supported" = "yes"; then
BACKTRACE_SUPPORTED=1
fi
AC_SUBST(BACKTRACE_SUPPORTED)
AC_CHECK_HEADERS(sys/mman.h)
if test "$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 "$ALLOC_FILE" = "alloc.lo"; then
BACKTRACE_USES_MALLOC=1
fi
AC_SUBST(BACKTRACE_USES_MALLOC)
AC_CACHE_CHECK([whether tests can run],
[libbacktrace_cv_sys_native],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
[libbacktrace_cv_sys_native=yes],
[libbacktrace_cv_sys_native=no],
[libbacktrace_cv_sys_native=no])])
AM_CONDITIONAL(NATIVE, test "$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
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