From 4eaf91a7a729f96b020324cc78e66bc687f549f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Oudompheng?= <oudomphe@phare.normalesup.org>
Date: Tue, 30 Jul 2013 04:31:15 +0200
Subject: [PATCH] cmd/gc: make bisonerrors compatible with GNU Bison 3.0

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/11990043
---
 src/cmd/gc/bisonerrors | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cmd/gc/bisonerrors b/src/cmd/gc/bisonerrors
index 8886a8e529e..1f97fc8cec4 100755
--- a/src/cmd/gc/bisonerrors
+++ b/src/cmd/gc/bisonerrors
@@ -35,6 +35,9 @@ grammar && NF>0 {
 	}
 	rulelhs[$1] = r
 	rulesize[$1] = NF-2
+	if(rulesize[$1] == 1 && $3 == "%empty") {
+		rulesize[$1] = 0
+	}
 	if(rulesize[$1] == 3 && $3 $4 $5 == "/*empty*/") {
 		rulesize[$1] = 0
 	}