cmd/syncthing: Only SetTraceback on Go 1.7+ (fixes #3664)

cmd/syncthing/main.go

@@ -23,7 +23,6 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
-	"runtime/debug"
 	"runtime/pprof"
 	"sort"
 	"strconv"
@@ -281,9 +280,6 @@ func parseCommandLineOptions() RuntimeOptions {
 }
 
 func main() {
-	// We want all (our) goroutines in panic traces.
-	debug.SetTraceback("all")
-
 	options := parseCommandLineOptions()
 	l.SetFlags(options.logFlags)
 

cmd/syncthing/traceback.go

@@ -0,0 +1,17 @@
+// Copyright (C) 2016 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+//+build go1.7
+
+package main
+
+import "runtime/debug"
+
+func init() {
+	// We want all (our) goroutines in panic traces.
+	debug.SetTraceback("all")
+}
+