Do not use the C extension on non-CRuby

Author: eregon

Rakefile

@@ -7,7 +7,11 @@ Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
-require 'rake/extensiontask'
-Rake::ExtensionTask.new("pathname")
+if RUBY_ENGINE == 'ruby'
+  require 'rake/extensiontask'
+  Rake::ExtensionTask.new("pathname")
+else
+  task :compile
+end
 
 task :default => [:compile, :test]

ext/pathname/extconf.rb

@@ -1,3 +1,9 @@
 # frozen_string_literal: false
+
 require 'mkmf'
-create_makefile('pathname')
+
+if RUBY_ENGINE == "ruby"
+  create_makefile('pathname')
+else
+  File.write("Makefile", dummy_makefile($srcdir).join(""))
+end

lib/pathname.rb

@@ -28,7 +28,7 @@ module ::Kernel
   # :startdoc:
 end
 
-require 'pathname.so'
+require 'pathname.so' if RUBY_ENGINE == 'ruby'
 
 #
 # Pathname represents the name of a file or directory on the filesystem,