From e69012ce2a366e54bc86cd17f2fb1d73fc567a89 Mon Sep 17 00:00:00 2001
From: Dmitriy Vyukov <dvyukov@google.com>
Date: Wed, 15 May 2013 11:10:26 +0400
Subject: [PATCH] runtime: use enums instead static vars for debugging Compiler
 can detect and delete dead code with enums, but can not with static vars.

R=golang-dev, dave, r
CC=golang-dev
https://golang.org/cl/9377043
---
 src/pkg/runtime/chan.c  | 4 ++--
 src/pkg/runtime/slice.c | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/pkg/runtime/chan.c b/src/pkg/runtime/chan.c
index fba36a4c34..0a01a403d2 100644
--- a/src/pkg/runtime/chan.c
+++ b/src/pkg/runtime/chan.c
@@ -11,8 +11,6 @@
 #define	MAXALIGN	7
 #define	NOSELGEN	1
 
-static	int32	debug	= 0;
-
 typedef	struct	WaitQ	WaitQ;
 typedef	struct	SudoG	SudoG;
 typedef	struct	Select	Select;
@@ -58,6 +56,8 @@ uint32 runtime·Hchansize = sizeof(Hchan);
 
 enum
 {
+	debug = 0,
+
 	// Scase.kind
 	CaseRecv,
 	CaseSend,
diff --git a/src/pkg/runtime/slice.c b/src/pkg/runtime/slice.c
index 354c54c865..d46d60f24a 100644
--- a/src/pkg/runtime/slice.c
+++ b/src/pkg/runtime/slice.c
@@ -9,7 +9,10 @@
 #include "malloc.h"
 #include "race.h"
 
-static	bool	debug	= 0;
+enum
+{
+	debug = 0
+};
 
 static	void	makeslice1(SliceType*, intgo, intgo, Slice*);
 static	void	growslice1(SliceType*, Slice, intgo, Slice *);