From d303a2c45a60240cbd6ed33745c267205642184d Mon Sep 17 00:00:00 2001
From: hsbt <hsbt@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 20 Oct 2018 07:27:18 +0000
Subject: [PATCH] Merge fiddle from github repository.

  * ext/fiddle/extconf.rb: It supports to build libffi with standalone gem.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65210 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/fiddle/extconf.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index 2c333001e5..654667feed 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -18,6 +18,16 @@ if ! bundle
   end and (have_library('ffi') || have_library('libffi'))
 end or
 begin
+  # for https://github.com/ruby/fiddle
+  if bundle && File.exit?("../../bin/extlibs.rb")
+    require "fileutils"
+    require_relative "../../bin/extlibs"
+    extlibs = ExtLibs.new
+    cache_dir = File.expand_path("../../tmp/.download_cache", $srcdir)
+    ext_dir = File.expand_path("../../ext", $srcdir)
+    Dir.glob("#{$srcdir}/libffi-*/").each{|dir| FileUtils.rm_rf(dir)}
+    extlibs.run(["--cache=#{cache_dir}", ext_dir])
+  end
   ver = bundle != false &&
         Dir.glob("#{$srcdir}/libffi-*/")
         .map {|n| File.basename(n)}