Look up the language module

Look up language module with `MakeMakefile.[]`, insted of a
accessing constant under that module directly, to get rid of
expose the constant to the toplevel inadvertently.

1 files changed, 11 insertions, 1 deletions

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 8df6e9ad59..ce72668501 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2776,7 +2776,17 @@ distclean: clean distclean-so distclean-static distclean-rb-default distclean-rb
 realclean: distclean
 "
 
-  module CXX
+  @lang = Hash.new(self)
+
+  def self.[](name)
+    @lang.fetch(name)
+  end
+
+  def self.[]=(name, mod)
+    @lang[name] = mod
+  end
+
+  self["C++"] = Module.new do
     include MakeMakefile
     extend self