--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgo/misc/cgo/test/issue4029.go	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,68 @@
+// Copyright 2012 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.
+
+// +build !windows
+
+package cgotest
+
+/*
+#include <dlfcn.h>
+#cgo linux LDFLAGS: -ldl
+
+extern void call4029(void *arg);
+*/
+import "C"
+
+import (
+	"testing"
+)
+
+var callbacks int
+
+//export IMPIsOpaque
+func IMPIsOpaque() {
+	callbacks++
+}
+
+//export IMPInitWithFrame
+func IMPInitWithFrame() {
+	callbacks++
+}
+
+//export IMPDrawRect
+func IMPDrawRect() {
+	callbacks++
+}
+
+//export IMPWindowResize
+func IMPWindowResize() {
+	callbacks++
+}
+
+func test4029(t *testing.T) {
+	loadThySelf(t, "IMPWindowResize")
+	loadThySelf(t, "IMPDrawRect")
+	loadThySelf(t, "IMPInitWithFrame")
+	loadThySelf(t, "IMPIsOpaque")
+	if callbacks != 4 {
+		t.Errorf("got %d callbacks, expected 4", callbacks)
+	}
+}
+
+func loadThySelf(t *testing.T, symbol string) {
+	this_process := C.dlopen(nil, C.RTLD_NOW)
+	if this_process == nil {
+		t.Error("dlopen:", C.GoString(C.dlerror()))
+		return
+	}
+	defer C.dlclose(this_process)
+
+	symbol_address := C.dlsym(this_process, C.CString(symbol))
+	if symbol_address == nil {
+		t.Error("dlsym:", C.GoString(C.dlerror()))
+		return
+	}
+	t.Log(symbol, symbol_address)
+	C.call4029(symbol_address)
+}