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Check format of enum constant

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -327,12 +327,10 @@

 		sym->flags |= ISCONSTANT;

 		sym->type = inttype;

 		if (accept('=')) {

-			Node *np = constexpr();

-			/*

-			 * TODO: check that the type of the constant

-			 * expression is the correct, that in this

-			 * case should be int

-			 */

+			Node *np = iconstexpr();

+

+			if (np == NULL)

+				error("invalid enumeration value");

 			val = np->sym->u.i;

 			freetree(np);

 		}