re PR c++/55137 (Unexpected static structure initialization)

	PR c++/55137
	* semantics.c (verify_constant): Track overflow separately.
	(reduced_constant_expression_p): Don't check it here.
	(cxx_eval_constant_expression): Check it on CSTs.
	(cxx_eval_outermost_constant_expr): Treat overflows as non-constant
	at this point, but still return the folded version.
	(potential_constant_expression_1): Don't check overflow.

From-SVN: r193727

gcc/cp/ChangeLog

 2012-11-22  Jason Merrill  <jason@redhat.com>
 
+	PR c++/55137
+	* semantics.c (verify_constant): Track overflow separately.
+	(reduced_constant_expression_p): Don't check it here.
+	(cxx_eval_constant_expression): Check it on CSTs.
+	(cxx_eval_outermost_constant_expr): Treat overflows as non-constant
+	at this point, but still return the folded version.
+	(potential_constant_expression_1): Don't check overflow.
+
 	* call.c (extend_ref_init_temps_1): Recompute TREE_CONSTANT for
 	the ADDR_EXPR.
 

gcc/testsuite/g++.dg/init/static-init3.C

+// PR c++/55137
+// s should have constant initialization.
+// { dg-final { scan-assembler-not "GLOBAL" } }
+
+struct S {
+  int b;
+};
+
+struct S s = { -1 + (int)(sizeof(int) - 1) };