From a0203ca711308b96d33acb895d4f7d254594287c Mon Sep 17 00:00:00 2001
From: Alexandre Oliva <aoliva@redhat.com>
Date: Wed, 9 Nov 2005 20:13:41 +0000
Subject: re PR other/4372 (#pragma weak pthread* inclusion causes applications
 to crash without a linker error when one forgets to link with -lpthread)

PR other/4372
* tree.h (IDENTIFIER_TRANSPARENT_ALIAS): New.
(TREE_DEPRECATED): Adjust comment.  Check for a DECL.
* c-common.c (handle_weakref_attribute): New.
(c_common_attribute_table): Add weakref.
* configure.ac (HAVE_GAS_WEAKREF): Check for weakref support
in the assembler.
* configure, config.in: Rebuilt.
* defaults.h (ASM_OUTPUT_WEAKREF): Define if HAVE_GAS_WEAKREF.
* doc/extend.texi: Document weakref attribute.
* varasm.c (ultimate_transparent_alias_target): New
(assemble_name): Use it.
(weak_finish_1): Split out of...
(weak_finish): ... and deal with weakrefs in...
(weakref_targets): ... new list.
(globalize_decl): Clean up weakref_targets.
(do_assemble_alias): Handle weakrefs.
(finish_aliases_1): Do not reject weakrefs to external symbols.
(assemble_alias): Handle weakrefs.

From-SVN: r106703
---
 gcc/configure | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'gcc/configure')

diff --git a/gcc/configure b/gcc/configure
index df77571..ba43b58 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -13988,6 +13988,43 @@ _ACEOF
 
 fi
 
+echo "$as_me:$LINENO: checking assembler for .weakref" >&5
+echo $ECHO_N "checking assembler for .weakref... $ECHO_C" >&6
+if test "${gcc_cv_as_weakref+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  gcc_cv_as_weakref=no
+    if test $in_tree_gas = yes; then
+    if test $gcc_cv_gas_vers -ge `expr \( \( 2 \* 1000 \) + 17 \) \* 1000 + 0`
+  then gcc_cv_as_weakref=yes
+fi
+  elif test x$gcc_cv_as != x; then
+    echo '	.weakref foobar, barfnot' > conftest.s
+    if { ac_try='$gcc_cv_as  -o conftest.o conftest.s >&5'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }
+    then
+	gcc_cv_as_weakref=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+echo "$as_me:$LINENO: result: $gcc_cv_as_weakref" >&5
+echo "${ECHO_T}$gcc_cv_as_weakref" >&6
+if test $gcc_cv_as_weakref = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_GAS_WEAKREF 1
+_ACEOF
+
+fi
+
 echo "$as_me:$LINENO: checking assembler for .nsubspa comdat" >&5
 echo $ECHO_N "checking assembler for .nsubspa comdat... $ECHO_C" >&6
 if test "${gcc_cv_as_nsubspa_comdat+set}" = set; then
-- 
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