Merge fiddle-1.1.1

Merged: https://github.com/ruby/ruby/pull/6890

ext/fiddle/extconf.rb

@@ -151,7 +151,7 @@ if libffi_version
   libffi_version = libffi_version.gsub(/-rc\d+/, '')
   libffi_version = (libffi_version.split('.').map(&:to_i) + [0,0])[0,3]
   $defs.push(%{-DRUBY_LIBFFI_MODVERSION=#{ '%d%03d%03d' % libffi_version }})
-  puts "libffi_version: #{libffi_version.join('.')}"
+  warn "libffi_version: #{libffi_version.join('.')}"
 end
 
 case

ext/fiddle/fiddle.c

@@ -650,6 +650,30 @@ Init_fiddle(void)
     rb_define_module_function(mFiddle, "realloc", rb_fiddle_realloc, 2);
     rb_define_module_function(mFiddle, "free", rb_fiddle_free, 1);
 
+    /* Document-const: Qtrue
+     *
+     * The value of Qtrue
+     */
+    rb_define_const(mFiddle, "Qtrue", INT2NUM(Qtrue));
+
+    /* Document-const: Qfalse
+     *
+     * The value of Qfalse
+     */
+    rb_define_const(mFiddle, "Qfalse", INT2NUM(Qfalse));
+
+    /* Document-const: Qnil
+     *
+     * The value of Qnil
+     */
+    rb_define_const(mFiddle, "Qnil", INT2NUM(Qnil));
+
+    /* Document-const: Qundef
+     *
+     * The value of Qundef
+     */
+    rb_define_const(mFiddle, "Qundef", INT2NUM(Qundef));
+
     Init_fiddle_function();
     Init_fiddle_closure();
     Init_fiddle_handle();

test/fiddle/test_fiddle.rb

@@ -5,6 +5,13 @@ rescue LoadError
 end
 
 class TestFiddle < Fiddle::TestCase
+  def test_nil_true_etc
+    assert_equal Fiddle::Qtrue, Fiddle.dlwrap(true)
+    assert_equal Fiddle::Qfalse, Fiddle.dlwrap(false)
+    assert_equal Fiddle::Qnil, Fiddle.dlwrap(nil)
+    assert Fiddle::Qundef
+  end
+
   def test_windows_constant
     require 'rbconfig'
     if RbConfig::CONFIG['host_os'] =~ /mswin|mingw/