re PR lto/48042 (lto segfaults while building Qt 4.7.2 with -g -flto -fwhole-program)

2011-12-09  Richard Guenther  <rguenther@suse.de>

	PR lto/48042
	* tree.c (free_lang_data_in_decl): Remove freeing conditional
	on debuginfo level.

	* g++.dg/lto/pr48042_0.C: New testcase.

From-SVN: r182163

gcc/ChangeLog

+2011-12-09  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48042
+	* tree.c (free_lang_data_in_decl): Remove freeing conditional
+	on debuginfo level.
+
 2011-12-09  Joern Rennecke  <joern.rennecke@embecosm.com>
 
 	PR middle-end/40154

gcc/testsuite/ChangeLog

 2011-12-09  Richard Guenther  <rguenther@suse.de>
 
+	PR lto/48042
+	* g++.dg/lto/pr48042_0.C: New testcase.
+
+2011-12-09  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/51482
 	* g++.dg/torture/pr51482.C: New testcase.
 

gcc/testsuite/g++.dg/lto/pr48042_0.C

+// { dg-lto-do link }
+// { dg-extra-ld-options "-r -nostdlib -g" }
+
+class A {
+    virtual int x() = 0;
+};
+
+class B:public A {
+    int x();
+};
+
+int B::x() {
+}
+

gcc/tree.c

@@ -4600,11 +4600,6 @@ free_lang_data_in_decl (tree decl)
   if (TREE_CODE (decl) == FIELD_DECL)
     free_lang_data_in_one_sizepos (&DECL_FIELD_OFFSET (decl));
 
- /* DECL_FCONTEXT is only used for debug info generation.  */
- if (TREE_CODE (decl) == FIELD_DECL
-     && debug_info_level < DINFO_LEVEL_TERSE)
-   DECL_FCONTEXT (decl) = NULL_TREE;
-
  if (TREE_CODE (decl) == FUNCTION_DECL)
     {
       if (gimple_has_body_p (decl))