From 2951e3d83b302b914d291b83f48ac59dc5df3198 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 10 Jul 2023 19:19:37 +0900
Subject: [PATCH] Allow nmake to ignore errors

cmd.exe can redirect file descriptor other than STDOUT, while
command.com couldn't.
---
 lib/mkmf.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index cd67645a5d..2acff0ddc0 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2699,7 +2699,7 @@ MESSAGE
   when $mswin
     $nmake = ?m if /nmake/i =~ make
   end
-  $ignore_error = $nmake ? '' : " 2> #{File::NULL} || true"
+  $ignore_error = " 2> #{File::NULL} || #{$mswin ? 'exit /b0' : 'true'}"
 
   RbConfig::CONFIG["srcdir"] = CONFIG["srcdir"] =
     $srcdir = arg_config("--srcdir", File.dirname($0))