Update document on how to use a different visual studio version
We can use environment variable "GYP_MSVS_VERSION" to control
which Visual Studio version we want to use for compilation.
Add the info in our document.
BUG=pdfium:836
Change-Id: Iac6b104708fa1414239fe59d25eb465765e22397
Reviewed-on: https://pdfium-review.googlesource.com/8990
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/README.md b/README.md
index ca44395..3c24b0c 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,9 @@
PDFium uses a similar Windows toolchain as Chromium:
#### Open source contributors
-Visual Studio 2015 Update 2 or later is highly recommended.
+Visual Studio 2015 Update 2 or later is highly recommended. Visual Studio 2015
+is current default version, run `set GYP_MSVS_VERSION=2017` when you use Visual
+Studio 2017.
Run `set DEPOT_TOOLS_WIN_TOOLCHAIN=0`, or set that variable in your global
environment.
