From 7184e03eb259b31a1e2fda200e63924ec4a041b3 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 24 Jan 2018 08:25:36 +0000
Subject: [PATCH] mkmf.rb: werror on mswin

* lib/mkmf.rb (MakeMakefile#try_ldflags): enable warning checking
  on mswin, link.exe warns -l options but does not fail.
  [Bug #13069]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62024 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/mkmf.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index c52a66643a..773cf9b7e7 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -657,6 +657,7 @@ MSG
   end
 
   def try_ldflags(flags, opts = {})
+    opts = {:werror => true}.update(opts) if $mswin
     try_link(MAIN_DOES_NOTHING, flags, opts)
   end