From 8206a01c99ed929327365a16915233a867c54aed Mon Sep 17 00:00:00 2001
From: Refael Ackermann <refack@gmail.com>
Date: Mon, 19 Jun 2017 20:11:22 -0400
Subject: [PATCH] build,win: skip `vcvarsall.bat` if env is set
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PR-URL: https://github.com/nodejs/node/pull/13806
Fixes: https://github.com/nodejs/node/issues/13765
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Kunal Pathak <kunal.pathak@microsoft.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 vcbuild.bat | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vcbuild.bat b/vcbuild.bat
index a1c011780cbef6..0af8047e4a0e96 100644
--- a/vcbuild.bat
+++ b/vcbuild.bat
@@ -200,9 +200,12 @@ if defined msi (
     goto wix-not-found
   )
 )
-@rem VS2015 vsvarsall is quick, so run anyway
+
+@rem check if VS2015 is already setup
+if "_%VisualStudioVersion%_" == "_14.0_" if "_%VCVARS_VER%_" == "_140_" goto found_vs2015
 call "%VS140COMNTOOLS%\..\..\vc\vcvarsall.bat"
 SET VCVARS_VER=140
+:found_vs2015
 if not defined VCINSTALLDIR goto msbuild-not-found
 @rem Visual C++ Build Tools 2015 does not define VisualStudioVersion
 echo Found MSVS version 14.0