From 46302185383a079957a0e72c785ef0c507ab1d46 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Fri, 3 Oct 2014 16:42:18 -0400
Subject: [PATCH] misc/cgo/test: fail issue 7978 with clearer error when
 GOTRACEBACK != 2

The test doesn't work with GOTRACEBACK != 2.
Diagnose that failure mode.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/152970043
---
 misc/cgo/test/issue7978.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/misc/cgo/test/issue7978.go b/misc/cgo/test/issue7978.go
index 39864476ce..5feed07b95 100644
--- a/misc/cgo/test/issue7978.go
+++ b/misc/cgo/test/issue7978.go
@@ -29,6 +29,7 @@ static void issue7978c(uint32_t *sync) {
 import "C"
 
 import (
+	"os"
 	"runtime"
 	"strings"
 	"sync/atomic"
@@ -81,6 +82,9 @@ func issue7978go() {
 }
 
 func test7978(t *testing.T) {
+	if os.Getenv("GOTRACEBACK") != "2" {
+		t.Fatalf("GOTRACEBACK must be 2")
+	}
 	issue7978sync = 0
 	go issue7978go()
 	// test in c code, before callback
-- 
2.50.0