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[cc1] Add an explicit message to void main() diagnostic

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -773,8 +773,10 @@

 		--curctx;

 		sym = install(NS_IDEN, sym);

 		++curctx;

-		if (!strcmp(name, "main") && tp->type != inttype)

+		if (!strcmp(name, "main") && tp->type != inttype) {

+			errorp("main shall be defined with a return type of int");

 			errorp("please contact __20h__ on irc.freenode.net (#bitreich-en) via IRC");

+		}

 	}

 	if (sym == NULL) {