From: Russ Cox <rsc@golang.org>
Date: Mon, 2 Nov 2009 18:50:18 +0000 (-0800)
Subject: do not emit USED for global x when compiling "_ = x;"
X-Git-Tag: weekly.2009-11-06~136
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d00248980be23b5c889601cf749f5738a5dc8724;p=gostls13.git

do not emit USED for global x when compiling "_ = x;"

R=ken@golang.org
CC=r
http://go/go-review/1018019
---

diff --git a/src/cmd/gc/gen.c b/src/cmd/gc/gen.c
index bb1b19bfc9..475058fa28 100644
--- a/src/cmd/gc/gen.c
+++ b/src/cmd/gc/gen.c
@@ -427,7 +427,7 @@ cgen_discard(Node *nr)
 
 	switch(nr->op) {
 	case ONAME:
-		if(!(nr->class & PHEAP))
+		if(!(nr->class & PHEAP) && nr->class != PEXTERN && nr->class != PFUNC)
 			gused(nr);
 		break;