From 24f302a69d80f2e89db81fad600165b2f857c193 Mon Sep 17 00:00:00 2001
From: David Symonds <dsymonds@golang.org>
Date: Mon, 19 Aug 2013 11:11:27 +1000
Subject: [PATCH] cmd/dist: join with TMPDIR more carefully to avoid // in
 path.

This might fix the mkdtemp problem on the darwin builders if they
have TMPDIR set to a path ending in a slash; at worse this will
result in cleaner path names.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13097043
---
 src/cmd/dist/unix.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/cmd/dist/unix.c b/src/cmd/dist/unix.c
index 4a4feeb064..0011e2f278 100644
--- a/src/cmd/dist/unix.c
+++ b/src/cmd/dist/unix.c
@@ -466,7 +466,9 @@ xworkdir(void)
 	xgetenv(&b, "TMPDIR");
 	if(b.len == 0)
 		bwritestr(&b, "/var/tmp");
-	bwritestr(&b, "/go-cbuild-XXXXXX");
+	if(b.p[b.len-1] != '/')
+		bwrite(&b, "/", 1);
+	bwritestr(&b, "go-cbuild-XXXXXX");
 	p = bstr(&b);
 	if(mkdtemp(p) == nil)
 		fatal("mkdtemp(%s): %s", p, strerror(errno));