[backport from gcc-4.7/trunk r181172, one hunk only, fixes PR51969 <mikpe@it.uu.se>]

gcc/

2011-11-08  Michael Matz  <matz@suse.de>

	* gengtype.c (write_field_root): Avoid out-of-scope access of newv.

--- gcc-4.6.2/gcc/gengtype.c.~1~	2010-11-25 20:03:27.000000000 +0100
+++ gcc-4.6.2/gcc/gengtype.c	2012-02-05 22:28:03.000000000 +0100
@@ -3594,14 +3594,13 @@ write_field_root (outf_p f, pair_p v, ty
 		  int has_length, struct fileloc *line, const char *if_marked,
 		  bool emit_pch, type_p field_type, const char *field_name)
 {
+  struct pair newv;
   /* If the field reference is relative to V, rather than to some
      subcomponent of V, we can mark any subarrays with a single stride.
      We're effectively treating the field as a global variable in its
      own right.  */
   if (v && type == v->type)
     {
-      struct pair newv;
-
       newv = *v;
       newv.type = field_type;
       newv.name = ACONCAT ((v->name, ".", field_name, NULL));