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

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

do not emit USED for global x when compiling "_ = x;"
R=ken@golang.org CC=r http://go/go-review/1018019
d0024898 · Russ Cox · 102357f0 · d0024898
Commit d0024898 authored Nov 02, 2009 by Russ Cox
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src/cmd/gc/gen.c src/cmd/gc/gen.c +1 -1

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--- 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;