re PR lto/48437 (LTO crashes with block-local function declarations)

2011-12-08  Richard Guenther  <rguenther@suse.de>

	PR lto/48437
	* lto-streamer-out.c (tree_is_indexable): Exclude block-local
	extern declarations.

	* gcc.dg/lto/20111207-2_0.c: New testcase.
	* gcc.dg/guality/pr48437.c: Likewise.

From-SVN: r182100

gcc/ChangeLog

+2011-12-08  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48437
+	* lto-streamer-out.c (tree_is_indexable): Exclude block-local
+	extern declarations.
+
 2011-12-07  Andrew Pinski  <apinski@cavium.com>
 
 	PR middle-end/45416

gcc/lto-streamer-out.c

@@ -129,6 +129,16 @@ tree_is_indexable (tree t)
   else if (TREE_CODE (t) == VAR_DECL && decl_function_context (t)
 	   && !TREE_STATIC (t))
     return false;
+  /* If this is a decl generated for block local externs for
+     debug info generation, stream it unshared alongside BLOCK_VARS.  */
+  else if (VAR_OR_FUNCTION_DECL_P (t)
+	   /* ???  The following tests are a literal match on what
+	      c-decl.c:pop_scope does.  */
+	   && TREE_PUBLIC (t)
+	   && DECL_EXTERNAL (t)
+	   && DECL_CONTEXT (t)
+	   && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
+    return false;
   else
     return (TYPE_P (t) || DECL_P (t) || TREE_CODE (t) == SSA_NAME);
 }

gcc/testsuite/ChangeLog

+2011-12-08  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48437
+	* gcc.dg/lto/20111207-2_0.c: New testcase.
+	* gcc.dg/guality/pr48437.c: Likewise.
+
 2011-12-07  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/51401

gcc/testsuite/gcc.dg/guality/pr48437.c

+/* PR lto/48437 */
+/* { dg-do run } */
+/* { dg-options "-g" } */
+
+#include "../nop.h"
+
+int i __attribute__((used));
+int main()
+{
+  volatile int i;
+  for (i = 3; i < 7; ++i)
+    {
+      extern int i;
+      asm volatile (NOP : : : "memory"); /* { dg-final { gdb-test 14 "i" "0" } } */
+    }
+  return 0;
+}

gcc/testsuite/gcc.dg/lto/20111207-2_0.c

+/* { dg-lto-do run } */
+
+int
+test (void)
+{
+  int f (void);
+  return 0;
+}
+
+int
+main (void)
+{
+  int f (void);
+  int test (void);
+
+  return test ();
+}