re PR debug/48703 (segfault in canonicalize_for_substitution)

2011-04-21  Richard Guenther  <rguenther@suse.de>

	PR lto/48703
	* tree.c (free_lang_data_in_decl): Do not zero TREE_TYPE of
	DECL_NAME.

	* g++.dg/lto/pr48207-2_0.C: New testcase.
	* g++.dg/lto/pr48207-3_0.C: Likewise.

From-SVN: r172830

gcc/ChangeLog

+2011-04-21  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48703
+	* tree.c (free_lang_data_in_decl): Do not zero TREE_TYPE of
+	DECL_NAME.
+
 2011-04-21  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gimple.c (walk_gimple_op) <GIMPLE_CALL>: Fix couple of oversights.

gcc/testsuite/ChangeLog

+2011-04-21  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48703
+	* g++.dg/lto/pr48207-2_0.C: New testcase.
+	* g++.dg/lto/pr48207-3_0.C: Likewise.
+
 2011-04-21  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/volatile5.adb: New test.

gcc/testsuite/g++.dg/lto/pr48207-2_0.C

+// { dg-lto-do link }
+// { dg-lto-options { { -flto -g } } }
+
+namespace {
+    typedef struct {
+	int x;
+    } Foo;
+}
+
+int main () {}

gcc/testsuite/g++.dg/lto/pr48207-3_0.C

+// { dg-lto-do link }
+// { dg-lto-options { { -flto -g } } }
+
+void bar(void) {}
+
+void foo(void)
+{
+  typedef enum { ABC } DEF;
+  bar();
+}
+
+int main () {}

gcc/tree.c

@@ -4561,10 +4561,6 @@ free_lang_data_in_decl (tree decl)
   TREE_LANG_FLAG_5 (decl) = 0;
   TREE_LANG_FLAG_6 (decl) = 0;
 
-  /* Identifiers need not have a type.  */
-  if (DECL_NAME (decl))
-    TREE_TYPE (DECL_NAME (decl)) = NULL_TREE;
-
   free_lang_data_in_one_sizepos (&DECL_SIZE (decl));
   free_lang_data_in_one_sizepos (&DECL_SIZE_UNIT (decl));
   if (TREE_CODE (decl) == FIELD_DECL)