cmd/compile: do not emit args_stackmap for func _

Fixes #11699. Change-Id: I01bf506d76260bcdf828bbde52791e328aa441a5 Reviewed-on: https://go-review.googlesource.com/16921 Reviewed-by: Ian Lance Taylor <iant@golang.org>
golang · Nov 16, 2015 · 292ad59 · 292ad59
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diff --git a/src/cmd/compile/internal/gc/pgen.go b/src/cmd/compile/internal/gc/pgen.go
@@ -129,6 +129,9 @@ func gcsymdup(s *Sym) {
 }
 
 func emitptrargsmap() {
+	if Curfn.Func.Nname.Sym.Name == "_" {
+		return
+	}
 	sym := Lookup(fmt.Sprintf("%s.args_stackmap", Curfn.Func.Nname.Sym.Name))
 
 	nptr := int(Curfn.Type.Argwid / int64(Widthptr))

diff --git a/test/fixedbugs/issue11699.go b/test/fixedbugs/issue11699.go
@@ -0,0 +1,12 @@
+// compile
+
+// Copyright 2015 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// issue 11699; used to fail with duplicate _.args_stackmap symbols.
+
+package p
+
+func _()
+func _()