From b04219fdbbef06527f77e93129d6a196b6841f44 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Mon, 26 Sep 2016 17:23:26 +0200
Subject: [PATCH] cmd/utils: don't check for stderr redirect on windows

The redirect check did not work on Go 1.6 and below because Stat
returned an error for stdout and stderr. In Go 1.7 Stat works on stdout
but doesn't return anything meaningful, causing cmd/geth test failures
because the message is printed to stderr only. Fix it by printing to
stdout only.
---
 cmd/utils/cmd.go | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/cmd/utils/cmd.go b/cmd/utils/cmd.go
index 3b521a0e1..584afc804 100644
--- a/cmd/utils/cmd.go
+++ b/cmd/utils/cmd.go
@@ -23,6 +23,7 @@ import (
 	"os"
 	"os/signal"
 	"regexp"
+	"runtime"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -52,10 +53,16 @@ func openLogFile(Datadir string, filename string) *os.File {
 // is redirected to a different file.
 func Fatalf(format string, args ...interface{}) {
 	w := io.MultiWriter(os.Stdout, os.Stderr)
-	outf, _ := os.Stdout.Stat()
-	errf, _ := os.Stderr.Stat()
-	if outf != nil && errf != nil && os.SameFile(outf, errf) {
-		w = os.Stderr
+	if runtime.GOOS == "windows" {
+		// The SameFile check below doesn't work on Windows.
+		// stdout is unlikely to get redirected though, so just print there.
+		w = os.Stdout
+	} else {
+		outf, _ := os.Stdout.Stat()
+		errf, _ := os.Stderr.Stat()
+		if outf != nil && errf != nil && os.SameFile(outf, errf) {
+			w = os.Stderr
+		}
 	}
 	fmt.Fprintf(w, "Fatal: "+format+"\n", args...)
 	logger.Flush()