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# Process this file with autoconf to produce a configure script, like so:
# aclocal -I .. -I ../config && autoconf && autoheader && automake
AC_PREREQ(2.59)
AC_INIT(libmudflap, 1.0)
AC_CONFIG_SRCDIR(mf-runtime.c)
AC_CANONICAL_SYSTEM
ACX_NONCANONICAL_TARGET
AM_INIT_AUTOMAKE
AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
AC_ARG_ENABLE(version-specific-runtime-libs,
[ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
[case "$enableval" in
yes) version_specific_libs=yes ;;
no) version_specific_libs=no ;;
*) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
esac],
[version_specific_libs=no])
AC_MSG_RESULT($version_specific_libs)
AM_MAINTAINER_MODE
AC_EXEEXT
AM_ENABLE_MULTILIB(, ..)
target_alias=${target_alias-$host_alias}
AC_SUBST(target_alias)
AC_CONFIG_HEADERS(config.h)
AC_LANG_C
# The same as in boehm-gc and libstdc++. Have to borrow it from there.
# 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],[real_PRECIOUS])
m4_define([_AC_ARG_VAR_PRECIOUS],[])
AC_PROG_CC
m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
AC_SUBST(CFLAGS)
if test "x$GCC" != "xyes"; then
AC_MSG_ERROR([libmudflap must be built with GCC])
fi
AC_PROG_CPP
# Some hosts don't have dlsym(RTLD_NEXT, "symbol") for use in
# symbol interposition. We disable shared libraries for these.
AC_MSG_CHECKING([whether dlsym(RTLD_NEXT,...) is available])
AC_TRY_COMPILE([
#define _GNU_SOURCE
#include <dlfcn.h>
],
[void *foo = dlsym (RTLD_NEXT, "exit");],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
enable_shared=no])
AC_CHECK_HEADERS(stdint.h execinfo.h signal.h dlfcn.h dirent.h pwd.h grp.h \
netdb.h sys/ipc.h sys/sem.h sys/shm.h sys/wait.h ctype.h mntent.h \
sys/socket.h netinet/in.h arpa/inet.h dlfcn.h sys/mman.h)
AC_CHECK_FUNCS(backtrace backtrace_symbols gettimeofday signal)
AC_CHECK_FUNCS(fopen64 fseeko64 ftello64 stat64 freopen64)
AC_CHECK_FUNCS(setbuf setbuffer setlinebuf setvbuf)
AC_CHECK_FUNCS(strnlen memrchr strncpy memmem sethostname)
AC_CHECK_FUNCS(__ctype_b_loc __ctype_tolower_loc __ctype_toupper_loc)
AC_CHECK_FUNCS(getlogin cuserid getpwnam getpwuid getpwent getgrnam getgrgid getgrent)
AC_CHECK_FUNCS(getlogin_r getpwnam_r getpwuid_r getgrnam_r getgrgid_r)
AC_CHECK_FUNCS(getservent getservbyname getservbyport getaddrinfo gai_strerror)
AC_CHECK_FUNCS(getprotoent getprotobyname getprotobynumber)
AC_CHECK_FUNCS(getmntent setmntent addmntent)
AC_CHECK_FUNCS(inet_ntoa mmap munmap)
AC_CHECK_FUNCS(__libc_freeres)
AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>],[union semun foo;], [mf_have_semun=1], [mf_have_semun=0])
if test $mf_have_semun = 1
then
AC_DEFINE(HAVE_UNION_SEMUN, 1, [union semun defined in sys/ipc.h or sys/sem.h])
fi
AC_MSG_CHECKING([for socklen_t in sys/socket.h])
AC_TRY_COMPILE([#define _POSIX_PII_SOCKET
#include <sys/types.h>
#include <sys/socket.h>], [socklen_t x = 5;],
[AC_DEFINE(HAVE_SOCKLEN_T, 1, [Define it socklen_t typedef is in sys/socket.h.])
AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)])
AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL
AC_SUBST(enable_shared)
AC_SUBST(enable_static)
AC_CHECK_HEADER(stdint.h, [MF_HAVE_STDINT_H=1], [MF_HAVE_STDINT_H=0])
AC_SUBST(MF_HAVE_STDINT_H)
if test $MF_HAVE_STDINT_H = 1
then
MF_HAVE_UINTPTR_T=1
else
AC_TRY_COMPILE([#include <sys/types.h>], [uintptr_t k = 0;],
[MF_HAVE_UINTPTR_T=1], [MF_HAVE_UINTPTR_T=0])
fi
AC_SUBST(MF_HAVE_UINTPTR_T)
if test ! -d pth
then
# libmudflapth objects are built in this subdirectory
mkdir pth
fi
AC_CHECK_HEADERS(pthread.h)
AC_MSG_CHECKING([for thread model used by GCC])
target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
AC_MSG_RESULT([$target_thread_file])
# We only support posix threads, or no threads at all.
posix_threads=
case ${target_thread_file} in
posix)
posix_threads=yes
;;
single)
;;
*)
echo "${target_thread_file} is an unsupported thread package" 1>&2
exit 1
;;
esac
AM_CONDITIONAL(LIBMUDFLAPTH, [test "x$posix_threads" != "x"])
if test "x$posix_threads" != "x"
then
build_libmudflapth=1
else
build_libmudflapth=0
fi
AC_SUBST(build_libmudflapth)
AC_CHECK_LIB(dl, dlsym)
# Calculate toolexeclibdir
# Also toolexecdir, though it's only used in toolexeclibdir
case ${version_specific_libs} in
yes)
# Need the gcc compiler version to know where to install libraries
# and header files if --enable-version-specific-runtime-libs option
# is selected.
toolexecdir='$(libdir)/gcc/$(target_alias)'
toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
;;
no)
if test -n "$with_cross_host" &&
test x"$with_cross_host" != x"no"; then
# Install a library built with a cross compiler in tooldir, not libdir.
toolexecdir='$(exec_prefix)/$(target_alias)'
toolexeclibdir='$(toolexecdir)/lib'
else
toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
toolexeclibdir='$(libdir)'
fi
multi_os_directory=`$CC -print-multi-os-directory`
case $multi_os_directory in
.) ;; # Avoid trailing /.
*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
esac
;;
esac
AC_SUBST(toolexecdir)
AC_SUBST(toolexeclibdir)
includedir=${toolexecdir}/include
AC_SUBST(includedir)
pthread_create_version='""'
if test "x$enable_shared" = "xyes" && test "x$posix_threads" != "x"; then
# NB: don't check for -lpthread here, because then it would be
# added to LIBS. For the thread-unaware libmudflap.la, we don't
# want it there.
# glibc-related hacks. dlsym() may pick the wrong version of
# interposed functions like pthread_create on modern glibc.
# We need to find the proper symbol version string, and use
# the nonstandard dlvsym().
AC_CHECK_FUNCS(dlvsym)
AC_CHECK_TOOL(NM, nm)
if test "x$ac_cv_have_dlvsym" != "x"; then
# Try compiling a simple pthreads program. Find the shared libraries it
# ends up with. Then use "nm" on those libraries to extract the
# default symbol versioning suffix ("@@"), if any. But that's tricky.
# Rather, run nm on the resulting executable. Unfortunately, autoconf
# doesn't appear to have a macro that builds a test executable for
# subsequent analysis ... so we do it by hand here.
cat >> conftest.c << EOF
#include <pthread.h>
int main () { void *p = (void *) & pthread_create; return (int) p; }
EOF
oldLIBS="$LIBS"
LIBS="$LIBS -lpthread"
pthread_create_version="\"\""
AC_MSG_CHECKING(pthread_create symbol version)
if eval $ac_link 2>&5 && test -s conftest${ac_exeext}; then
version=`$NM conftest${ac_exeect} | grep 'pthread_create@@' | sed -e 's/^.*@@//'`
if test "x$version" != "x"; then
pthread_create_version="\"$version\""
fi
fi
AC_MSG_RESULT($pthread_create_version)
LIBS="$oldLIBS"
fi
fi
AC_DEFINE_UNQUOTED(PTHREAD_CREATE_VERSION, $pthread_create_version, [pthread_create symbol version])
# Figure out whether the compiler supports "-ffunction-sections -fdata-sections",
# similarly to how libstdc++ does it
ac_test_CFLAGS="${CFLAGS+set}"
ac_save_CFLAGS="$CFLAGS"
# Check for -ffunction-sections -fdata-sections
AC_MSG_CHECKING([for gcc that supports -ffunction-sections -fdata-sections])
CFLAGS='-Werror -ffunction-sections -fdata-sections'
AC_TRY_COMPILE(, [int foo;], [ac_fdsections=yes], [ac_fdsections=no])
if test "$ac_test_CFLAGS" = set; then
CFLAGS="$ac_save_CFLAGS"
else
# this is the suspicious part
CFLAGS=""
fi
if test x"$ac_fdsections" = x"yes"; then
SECTION_FLAGS='-ffunction-sections -fdata-sections'
fi
AC_MSG_RESULT($ac_fdsections)
AC_SUBST(SECTION_FLAGS)
# Check for the name of the symbol used for the entry point.
AC_CACHE_CHECK([for the name of the symbol used for the entry point],
[mudflap_cv_entry_point], [
for name in _start __start unknown; do
AC_LINK_IFELSE([AC_LANG_PROGRAM([extern char $name@<:@@:>@;], [$name@<:@0@:>@ = 0;])],
[break])
done
mudflap_cv_entry_point="$name"])
if test "$mudflap_cv_entry_point" = unknown; then
AC_MSG_ERROR([none of the known symbol names works])
fi
AC_DEFINE_UNQUOTED([ENTRY_POINT], [$mudflap_cv_entry_point],
[Define to the name of the symbol used for the entry point.])
if test ${multilib} = yes; then
multilib_arg="--enable-multilib"
else
multilib_arg=
fi
# See if we support thread-local storage.
GCC_CHECK_TLS
AC_CONFIG_FILES([Makefile testsuite/Makefile testsuite/mfconfig.exp])
AC_OUTPUT
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