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re PR fortran/47571 (undefined reference to clock_gettime in Linux build of 02/01/2011) 

PR libfortran/47571
	* acinclude.m4 (LIBGFOR_GTHREAD_WEAK): Remove.
	(LIBGFOR_CHECK_WEAKREF): New test.
	* configure.ac: Call LIBGFOR_CHECK_WEAKREF instead of
	LIBGFOR_GTHREAD_WEAK.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* intrinsics/system_clock.c: Use SUPPORTS_WEAKREF instead of
	SUPPORTS_WEAK and GTHREAD_USE_WEAK.

From-SVN: r227335
This commit is contained in:
Francois-Xavier Coudert 2015-08-31 10:37:30 +00:00 committed by François-Xavier Coudert
parent 4ba00e9dba
commit e78549932d
6 changed files with 56 additions and 64 deletions
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12
libgfortran/ChangeLog
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@ -1,3 +1,15 @@
2015-08-31 Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
PR libfortran/47571
* acinclude.m4 (LIBGFOR_GTHREAD_WEAK): Remove.
(LIBGFOR_CHECK_WEAKREF): New test.
* configure.ac: Call LIBGFOR_CHECK_WEAKREF instead of
LIBGFOR_GTHREAD_WEAK.
* config.h.in: Regenerate.
* configure: Regenerate.
* intrinsics/system_clock.c: Use SUPPORTS_WEAKREF instead of
SUPPORTS_WEAK and GTHREAD_USE_WEAK.
2015-08-29 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libgfortran/67367

36
libgfortran/acinclude.m4
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@ -69,27 +69,21 @@ if (foovar > 10) return __sync_add_and_fetch (&foovar, -1);]])],
[Define to 1 if the target supports __sync_fetch_and_add])
fi])
dnl Check for pragma weak.
AC_DEFUN([LIBGFOR_GTHREAD_WEAK], [
AC_CACHE_CHECK([whether pragma weak works],
libgfor_cv_have_pragma_weak, [
gfor_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wunknown-pragmas"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
void foo (void);
#pragma weak foo
]], [[if (foo) foo ();]])],
libgfor_cv_have_pragma_weak=yes, libgfor_cv_have_pragma_weak=no)])
if test $libgfor_cv_have_pragma_weak = yes; then
AC_DEFINE(SUPPORTS_WEAK, 1,
[Define to 1 if the target supports #pragma weak])
fi
case "$host" in
*-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
AC_DEFINE(GTHREAD_USE_WEAK, 0,
[Define to 0 if the target shouldn't use #pragma weak])
;;
esac])
dnl Check whether target effectively supports weakref
AC_DEFUN([LIBGFOR_CHECK_WEAKREF], [
AC_CACHE_CHECK([whether the target supports weakref],
libgfor_cv_have_weakref, [
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wunknown-pragmas -Werror"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
static int mytoto (int) __attribute__((__weakref__("toto")));
]], [[return (mytoto != 0);]])],
libgfor_cv_have_weakref=yes, libgfor_cv_have_weakref=no)
CFLAGS="$save_CFLAGS"])
if test $libgfor_cv_have_weakref = yes; then
AC_DEFINE(SUPPORTS_WEAKREF, 1,
[Define to 1 if the target supports weakref])
fi])
dnl Check whether target can unlink a file still open.
AC_DEFUN([LIBGFOR_CHECK_UNLINK_OPEN_FILE], [

7
libgfortran/config.h.in
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@ -1,8 +1,5 @@
/* config.h.in. Generated from configure.ac by autoheader. */
/* Define to 0 if the target shouldn't use #pragma weak */
#undef GTHREAD_USE_WEAK
/* Define to 1 if you have the `access' function. */
#undef HAVE_ACCESS
@ -874,8 +871,8 @@
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Define to 1 if the target supports #pragma weak */
#undef SUPPORTS_WEAK
/* Define to 1 if the target supports weakref */
#undef SUPPORTS_WEAKREF
/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE

47
libgfortran/configure vendored
View File

@ -25953,51 +25953,48 @@ $as_echo "#define HAVE_SYNC_FETCH_AND_ADD 1" >>confdefs.h
fi
# Check out #pragma weak.
# Check out weakref support.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pragma weak works" >&5
$as_echo_n "checking whether pragma weak works... " >&6; }
if test "${libgfor_cv_have_pragma_weak+set}" = set; then :
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the target supports weakref" >&5
$as_echo_n "checking whether the target supports weakref... " >&6; }
if test "${libgfor_cv_have_weakref+set}" = set; then :
$as_echo_n "(cached) " >&6
else
gfor_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wunknown-pragmas"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wunknown-pragmas -Werror"
if test x$gcc_no_link = xyes; then
as_fn_error "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5
fi
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
void foo (void);
#pragma weak foo
static int mytoto (int) __attribute__((__weakref__("toto")));
int
main ()
{
if (foo) foo ();
return (mytoto != 0);
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
libgfor_cv_have_pragma_weak=yes
if ac_fn_c_try_link "$LINENO"; then :
libgfor_cv_have_weakref=yes
else
libgfor_cv_have_pragma_weak=no
libgfor_cv_have_weakref=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
CFLAGS="$save_CFLAGS"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgfor_cv_have_pragma_weak" >&5
$as_echo "$libgfor_cv_have_pragma_weak" >&6; }
if test $libgfor_cv_have_pragma_weak = yes; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgfor_cv_have_weakref" >&5
$as_echo "$libgfor_cv_have_weakref" >&6; }
if test $libgfor_cv_have_weakref = yes; then
$as_echo "#define SUPPORTS_WEAK 1" >>confdefs.h
$as_echo "#define SUPPORTS_WEAKREF 1" >>confdefs.h
fi
case "$host" in
*-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
$as_echo "#define GTHREAD_USE_WEAK 0" >>confdefs.h
;;
esac
# Various other checks on target

4
libgfortran/configure.ac
View File

@ -595,8 +595,8 @@ LIBGFOR_CHECK_ATTRIBUTE_ALIAS
# Check out sync builtins support.
LIBGFOR_CHECK_SYNC_FETCH_AND_ADD
# Check out #pragma weak.
LIBGFOR_GTHREAD_WEAK
# Check out weakref support.
LIBGFOR_CHECK_WEAKREF
# Various other checks on target
LIBGFOR_CHECK_UNLINK_OPEN_FILE

14
libgfortran/intrinsics/system_clock.c
View File

@ -45,16 +45,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
/* Weakref trickery for clock_gettime(). On Glibc <= 2.16,
clock_gettime() requires us to link in librt, which also pulls in
libpthread. In order to avoid this by default, only call
clock_gettime() through a weak reference.
Some targets don't support weak undefined references; on these
GTHREAD_USE_WEAK is 0. So we need to define it to 1 on other
targets. */
#ifndef GTHREAD_USE_WEAK
#define GTHREAD_USE_WEAK 1
#endif
#if SUPPORTS_WEAK && GTHREAD_USE_WEAK && defined(HAVE_CLOCK_GETTIME_LIBRT)
clock_gettime() through a weak reference. */
#if SUPPORTS_WEAKREF && defined(HAVE_CLOCK_GETTIME_LIBRT)
static int weak_gettime (clockid_t, struct timespec *)
__attribute__((__weakref__("clock_gettime")));
#endif
@ -90,7 +82,7 @@ gf_gettime_mono (time_t * secs, long * fracsecs, long * tck)
*fracsecs = ts.tv_nsec;
return err;
#else
#if defined(HAVE_CLOCK_GETTIME_LIBRT) && SUPPORTS_WEAK && GTHREAD_USE_WEAK
#if SUPPORTS_WEAKREF && defined(HAVE_CLOCK_GETTIME_LIBRT)
if (weak_gettime)
{
struct timespec ts;