1 files changed, 8 insertions, 0 deletions
diff --git a/test/mkmf/base.rb b/test/mkmf/base.rb
index f82952d0c5..49553cf10f 100644
--- a/test/mkmf/base.rb
+++ b/test/mkmf/base.rb
@@ -39,4 +39,12 @@ class TestMkmf < Test::Unit::TestCase
   def mkmf(*args, &block)
     @mkmfobj.instance_eval(*args, &block)
   end
+
+  def config_value(name)
+    create_tmpsrc("---config-value=#{name}")
+    xpopen(cpp_command('')) do |f|
+      f.grep(/^---config-value=(.*)/) {return $1}
+    end
+    nil
+  end
 end