re PR middle-end/35432 (ICE with zero-sized array)

        PR middle-end/35432
        * gimplify.c (gimplify_modify_expr): Do not optimize zero-sized types
        if want_value.
 testsuite/
        * gcc.c-torture/compile/pr35432.c: New file.

From-SVN: r138793

gcc/ChangeLog

+2008-08-06  Aldy Hernandez  <aldyh@redhat.com>
+
+	PR middle-end/35432
+	* gimplify.c (gimplify_modify_expr): Do not optimize zero-sized types
+	if want_value.
+
 2008-08-06  Jan Hubicka  <jh@suse.cz>
 
 	* predict.c (maybe_hot_frequency_p): When profile is absent, all

gcc/gimplify.c

@@ -4217,7 +4217,7 @@ gimplify_modify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
      side as statements and throw away the assignment.  Do this after
      gimplify_modify_expr_rhs so we handle TARGET_EXPRs of addressable
      types properly.  */
-  if (zero_sized_type (TREE_TYPE (*from_p)))
+  if (zero_sized_type (TREE_TYPE (*from_p)) && !want_value)
     {
       gimplify_stmt (from_p, pre_p);
       gimplify_stmt (to_p, pre_p);

gcc/testsuite/ChangeLog

+2008-08-06  Aldy Hernandez  <aldyh@redhat.com>
+	PR middle-end/35432
+	* gcc.c-torture/compile/pr35432.c: New file.
+
 2008-08-06  Arnaud Charlet  <charlet@adacore.com>
 
 	* gnat.dg/iface_test.ad[s,b]: New test.

gcc/testsuite/gcc.c-torture/compile/pr35432.c

+/* PR middle-end/35432 */
+
+struct A
+{
+  char c[0];
+};
+
+void foo(struct A a)
+{
+  (a = a).c;
+}