From 0359621241d09521978950ebc5e068352a549c64 Mon Sep 17 00:00:00 2001
From: Shenghou Ma <minux.ma@gmail.com>
Date: Tue, 13 Mar 2012 03:31:11 +0800
Subject: [PATCH] build: update Makefile to track source code dependencies
 better       Also update .hgignore to ignore y.output.

R=rsc
CC=golang-dev
https://golang.org/cl/5797061
---
 .hgignore           | 1 +
 src/cmd/gc/Makefile | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/.hgignore b/.hgignore
index 741d7c61b2..b140555fd9 100644
--- a/.hgignore
+++ b/.hgignore
@@ -33,6 +33,7 @@ misc/goplay/goplay
 misc/osx/*.pkg
 misc/osx/*.dmg
 src/cmd/6a/6a
+src/cmd/?a/y.output
 src/cmd/?l/enam.c
 src/cmd/cc/y.output
 src/cmd/dist/dist.dSYM
diff --git a/src/cmd/gc/Makefile b/src/cmd/gc/Makefile
index df34c05b27..58e25faaf9 100644
--- a/src/cmd/gc/Makefile
+++ b/src/cmd/gc/Makefile
@@ -6,7 +6,7 @@ include ../../Make.dist
 
 install: y.tab.h builtin.c
 
-y.tab.h: go.y
+y.tab.h: go.y go.errors bisonerrors
 	bison -v -y -d go.y
 	# make yystate global, yytname mutable
 	cat y.tab.c | sed '/ int yystate;/d; s/int yychar;/int yychar, yystate;/; s/static const char \*const yytname/const char *yytname/; s/char const \*yymsgp/char *yymsgp/' >y1.tab.c