Add support for VS2017

windows/config/toolchain.cmd

@@ -1,16 +1,28 @@
-@echo off
-SET TOOLCHAIN32=""
-SET TOOLCHAIN64=""
-SET TOOLCHAINARM=""
-
-IF "%VSVERSION%" == "14" (
-  SET TOOLCHAIN32="%VS140COMNTOOLS%..\..\VC\bin\vcvars32.bat"
-  SET TOOLCHAIN64="%VS140COMNTOOLS%..\..\VC\bin\amd64\vcvars64.bat"
-  SET TOOLCHAINARM="%VS140COMNTOOLS%..\..\VC\bin\x86_arm\vcvarsx86_arm.bat"
-  SET TOOLCHAIN_NAME=Visual Studio 14 2015
-)
-IF "%VSVERSION%" == "12" (
-  SET TOOLCHAIN32="%VS120COMNTOOLS%..\..\VC\bin\vcvars32.bat"
-  SET TOOLCHAIN64="%VS120COMNTOOLS%..\..\VC\bin\amd64\vcvars64.bat"
-  SET TOOLCHAIN_NAME=Visual Studio 12 2013
-)
+@echo off
+
+SET TOOLCHAIN32=""
+SET TOOLCHAIN64=""
+SET TOOLCHAINARM=""
+
+SET CWD=%~dp0
+for /f "usebackq tokens=*" %%i in (`%CWD%\vswhere.exe -latest -products * -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath`) do (
+  set VS2017DIR=%%i
+)
+
+IF "%VSVERSION%" == "15" (
+  SET TOOLCHAIN32="%VS2017DIR%\VC\Auxiliary\Build\vcvars32.bat"
+  SET TOOLCHAIN64="%VS2017DIR%\VC\Auxiliary\Build\vcvars64.bat"
+  SET TOOLCHAINARM="%VS2017DIR%\VC\Auxiliary\Build\vcvarsx86_arm.bat"
+  SET TOOLCHAIN_NAME=Visual Studio 15 2017
+)
+IF "%VSVERSION%" == "14" (
+  SET TOOLCHAIN32="%VS140COMNTOOLS%..\..\VC\bin\vcvars32.bat"
+  SET TOOLCHAIN64="%VS140COMNTOOLS%..\..\VC\bin\amd64\vcvars64.bat"
+  SET TOOLCHAINARM="%VS140COMNTOOLS%..\..\VC\bin\x86_arm\vcvarsx86_arm.bat"
+  SET TOOLCHAIN_NAME=Visual Studio 14 2015
+)
+IF "%VSVERSION%" == "12" (
+  SET TOOLCHAIN32="%VS120COMNTOOLS%..\..\VC\bin\vcvars32.bat"
+  SET TOOLCHAIN64="%VS120COMNTOOLS%..\..\VC\bin\amd64\vcvars64.bat"
+  SET TOOLCHAIN_NAME=Visual Studio 12 2013
+)