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Allow typedef of incomplete types

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -572,8 +572,8 @@

 	}

 	/* TODO: Add warning about ANSI limits */

-	if (!tp->defined && sclass != EXTERN)

-		error("declared variable '%s' of incomplete type", name);

+	if (!tp->defined && sclass != EXTERN && sclass != TYPEDEF)

+		errorp("declared variable '%s' of incomplete type", name);

 	if (tp->op == FTN) {

 		if (sclass == NOSCLASS)