* c-typeck.c (build_c_cast):  Fold constant variables into
	initial values.

	* gcc.dg/c90-const-expr-3.c (DZERO): New static variable
	(foo): Add few extra tests
	* gcc.dg/c99-const-expr-3.c: Likewise.
	* gcc.c-torture/execute/20030216-1.c: New.

From-SVN: r62987