From 16e4657acdacfd99bd649d50b44a748d86a31861 Mon Sep 17 00:00:00 2001
From: KOBAYASHI Shuji <shuujii@gmail.com>
Date: Fri, 12 Jul 2019 18:35:20 +0900
Subject: Lazy load `tasks/toolchains/*.rake`

---
 lib/mruby/build.rb | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/lib/mruby/build.rb b/lib/mruby/build.rb
index 887a5518e..d9d52948b 100644
--- a/lib/mruby/build.rb
+++ b/lib/mruby/build.rb
@@ -22,7 +22,6 @@ module MRuby
 
     def initialize(name, &block)
       @name, @initializer = name.to_s, block
-      MRuby::Toolchain.toolchains ||= {}
       MRuby::Toolchain.toolchains[@name] = self
     end
 
@@ -30,13 +29,8 @@ module MRuby
       conf.instance_exec(conf, params, &@initializer)
     end
 
-    def self.load
-      Dir.glob("#{MRUBY_ROOT}/tasks/toolchains/*.rake").each do |file|
-        Kernel.load file
-      end
-    end
+    self.toolchains = {}
   end
-  Toolchain.load
 
   class Build
     class << self
@@ -196,10 +190,15 @@ EOS
     end
 
     def toolchain(name, params={})
-      tc = Toolchain.toolchains[name.to_s]
-      fail "Unknown #{name} toolchain" unless tc
+      name = name.to_s
+      tc = Toolchain.toolchains[name] || begin
+        path = "#{MRUBY_ROOT}/tasks/toolchains/#{name}.rake"
+        fail "Unknown #{name} toolchain" unless File.exist?(path)
+        load path
+        Toolchain.toolchains[name]
+      end
       tc.setup(self, params)
-      @toolchains.unshift name.to_s
+      @toolchains.unshift name
     end
 
     def primary_toolchain
-- 
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