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Disallow sizeof of incomplete type

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -961,6 +961,8 @@

 	case SIZEOF:

 		next();

 		tp = (yytoken == '(') ? sizeexp() : typeof(unary());

+		if (!tp->defined)

+			errorp("sizeof applied to an incomplete type");

 		return sizeofnode(tp);

 	case INC:

 	case DEC: