re PR c++/52759 (ICE in cp/mangle.c)

	PR c++/52759
	* decl.c (start_decl): Don't call maybe_apply_pragma_weak
	if processing_template_decl.

	* g++.dg/ext/weak4.C: New test.

From-SVN: r185966

gcc/cp/ChangeLog

+2012-03-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/52759
+	* decl.c (start_decl): Don't call maybe_apply_pragma_weak
+	if processing_template_decl.
+
 2012-03-29  Jason Merrill  <jason@redhat.com>
 
 	PR c++/52743

gcc/cp/decl.c

@@ -4431,7 +4431,8 @@ start_decl (const cp_declarator *declarator,
     }
 
   /* If #pragma weak was used, mark the decl weak now.  */
-  maybe_apply_pragma_weak (decl);
+  if (!processing_template_decl)
+    maybe_apply_pragma_weak (decl);
 
   if (TREE_CODE (decl) == FUNCTION_DECL
       && DECL_DECLARED_INLINE_P (decl)

gcc/testsuite/ChangeLog

 2012-03-29  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/52759
+	* g++.dg/ext/weak4.C: New test.
+
 	PR tree-optimization/52760
 	* gcc.c-torture/execute/pr52760.c: New test.
 

gcc/testsuite/g++.dg/ext/weak4.C

+// PR c++/52759
+// { dg-do compile }
+// { dg-require-weak "" }
+// { dg-options "" }
+#pragma weak foo
+template <typename T>
+struct A { };
+template <typename T>
+void bar (A<T> &);