c-decl.c (pop_scope): Always set file-scope DECL_CONTEXT.

2010-09-24  Richard Guenther  <rguenther@suse.de>

	* c-decl.c (pop_scope): Always set file-scope DECL_CONTEXT.
	Make sure to not call set_type_context with error_mark_node.
	* langhooks.c (lhd_set_decl_assembler_name): Use DECL_FILE_SCOPE_P.

	* gcc.dg/lto/20091006-2_0.c: Prune warnings.

From-SVN: r164591

gcc/ChangeLog

 2010-09-24  Richard Guenther  <rguenther@suse.de>
 
+	* c-decl.c (pop_scope): Always set file-scope DECL_CONTEXT.
+	Make sure to not call set_type_context with error_mark_node.
+	* langhooks.c (lhd_set_decl_assembler_name): Use DECL_FILE_SCOPE_P.
+
+2010-09-24  Richard Guenther  <rguenther@suse.de>
+
 	* Makefile.in (OBJS-onestep): Remove.
 	(ALL_HOST_BACKEND_OBJS): Remove libbackend.o.
 	(libbackend.a): Remove onestep support.

gcc/c-decl.c

@@ -1203,15 +1203,14 @@ pop_scope (void)
 	      DECL_CHAIN (extp) = BLOCK_VARS (block);
 	      BLOCK_VARS (block) = extp;
 	    }
-	  /* If this is the file scope, and we are processing more
-	     than one translation unit in this compilation, set
-	     DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
-	     This makes same_translation_unit_p work, and causes
-	     static declarations to be given disambiguating suffixes.  */
-	  if (scope == file_scope && num_in_fnames > 1)
+	  /* If this is the file scope set DECL_CONTEXT of each decl to
+	     the TRANSLATION_UNIT_DECL.  This makes same_translation_unit_p
+	     work.  */
+	  if (scope == file_scope)
 	    {
 	      DECL_CONTEXT (p) = context;
-	      if (TREE_CODE (p) == TYPE_DECL)
+	      if (TREE_CODE (p) == TYPE_DECL
+		  && TREE_TYPE (p) != error_mark_node)
 		set_type_context (TREE_TYPE (p), context);
 	    }
 

gcc/langhooks.c

@@ -176,7 +176,7 @@ lhd_set_decl_assembler_name (tree decl)
      is less than the whole compilation.  Concatenate a distinguishing
      number - we use the DECL_UID.  */
 
-  if (TREE_PUBLIC (decl) || DECL_CONTEXT (decl) == NULL_TREE)
+  if (TREE_PUBLIC (decl) || DECL_FILE_SCOPE_P (decl))
     id = targetm.mangle_decl_assembler_name (decl, DECL_NAME (decl));
   else
     {

gcc/testsuite/ChangeLog

+2010-09-24  Richard Guenther  <rguenther@suse.de>
+
+	* gcc.dg/lto/20091006-2_0.c: Prune warnings.
+
 2010-09-24  Marcus Shawcroft  <marcus.shawcroft@arm.com>
 
 	* g++.dg/debug/dwarf2/nested-2.C: Permit the ARM @ character

gcc/testsuite/gcc.dg/lto/20091006-2_0.c

 /* { dg-lto-do link } */
+/* { dg-extra-ld-options "-w" } */
 
 extern int a[10];
 int main() { return 0; }