re PR target/50009 (Segmentation fault in tree_nop_conversion)

	PR target/50009
	* stor-layout.c (update_alignment_for_field): Don't ICE on
	packed flexible array members if ms_bitfield_layout_p.

	* gcc.c-torture/compile/pr50009.c: New test.

From-SVN: r177860

gcc/ChangeLog

 2011-08-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/50009
+	* stor-layout.c (update_alignment_for_field): Don't ICE on
+	packed flexible array members if ms_bitfield_layout_p.
+
 	PR target/50092
 	* config/i386/i386.c (assign_386_stack_local): Call validize_mem
 	on the result before returning it.

gcc/stor-layout.c

 /* C-compiler utilities for types and variables storage layout
    Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1996, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
-   Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+   2011 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -935,7 +935,8 @@ update_alignment_for_field (record_layout_info rli, tree field,
 	 applies if there was an immediately prior, nonzero-size
 	 bitfield.  (That's the way it is, experimentally.) */
       if ((!is_bitfield && !DECL_PACKED (field))
-	  || (!integer_zerop (DECL_SIZE (field))
+	  || ((DECL_SIZE (field) == NULL_TREE
+	       || !integer_zerop (DECL_SIZE (field)))
 	      ? !DECL_PACKED (field)
 	      : (rli->prev_field
 		 && DECL_BIT_FIELD_TYPE (rli->prev_field)

gcc/testsuite/ChangeLog

 2011-08-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/50009
+	* gcc.c-torture/compile/pr50009.c: New test.
+
 	PR target/50092
 	* gcc.dg/torture/pr50092.c: New test.
 

gcc/testsuite/gcc.c-torture/compile/pr50009.c

+/* PR target/50009 */
+
+struct S {
+  short a;
+  short b[];
+} __attribute__((packed));