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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227335 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 22 insertions, 25 deletions

diff --git a/libgfortran/configure b/libgfortran/configure
index 546a5a9b55e..12f6f131e61 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -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