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Do not warning in forward references

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -521,8 +521,14 @@

 	if (!name) {

 		sym->type = tp;

-		warn("empty declaration");

-		return sym;

+		switch (tp->op) {

+		default:

+			warn("empty declaration");

+		case STRUCT:

+		case UNION:

+		case ENUM:

+			return sym;

+		}

 	}

 	/* TODO: Add warning about ANSI limits */