From: Hiroshi Ioka <hirochachacha@gmail.com>
Date: Sat, 2 Sep 2017 01:36:01 +0000 (+0900)
Subject: cmd/go: don't write file if -n option is given
X-Git-Tag: go1.10beta1~1192
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=4439b21d0cf1fa3be7bd52ff79e83149f314458c;p=gostls13.git

cmd/go: don't write file if -n option is given

Change-Id: I01f5d3b4748d0ead8642ff3e53d1ae9c4378bcbc
Reviewed-on: https://go-review.googlesource.com/61111
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---

diff --git a/src/cmd/go/internal/work/build.go b/src/cmd/go/internal/work/build.go
index d6c7f0bcff..0395311ef6 100644
--- a/src/cmd/go/internal/work/build.go
+++ b/src/cmd/go/internal/work/build.go
@@ -3236,9 +3236,11 @@ func (b *Builder) gccSupportsFlag(flag string) bool {
 		if cfg.BuildN || cfg.BuildX {
 			b.Showcmd(b.WorkDir, "touch trivial.c")
 		}
-		src := filepath.Join(b.WorkDir, "trivial.c")
-		if err := ioutil.WriteFile(src, []byte{}, 0666); err != nil {
-			return false
+		if !cfg.BuildN {
+			src := filepath.Join(b.WorkDir, "trivial.c")
+			if err := ioutil.WriteFile(src, []byte{}, 0666); err != nil {
+				return false
+			}
 		}
 		b.flagCache = make(map[string]bool)
 	}