replace Builder.makes_object_file? with Builder.produces?

lib/rscons/builder.rb

@@ -1,6 +1,6 @@
 module Rscons
   class Builder
-    def self.makes_object_file?(env, fname)
+    def self.produces?(env, suffix)
       false
     end
   end

lib/rscons/builders/cc.rb

@@ -8,10 +8,8 @@ module Rscons
       'CEXTS' => ['.c'],
     }
 
-    def self.makes_object_file?(env, fname)
+    def self.produces?(env, suffix)
-      env['CEXTS'].find do |cext|
+      suffix == env['OBJSUFFIX']
-        fname =~ /#{cext}$/
-      end
     end
 
     def run(env, target, source)

lib/rscons/builders/program.rb

@@ -16,7 +16,7 @@ module Rscons
         if source =~ /#{env['OBJSUFFIX']}$/ or source =~ /#{env['LIBSUFFIX']}$/
           source
         else
-          builder_class = env.builders.values.find { |klass| klass.makes_object_file?(env, source) }
+          builder_class = env.builders.values.find { |klass| klass.produces?(env, env['OBJSUFFIX']) }
           if builder_class
             builder = builder_class.new
             builder.run(env, env.stem(source) + env['OBJSUFFIX'], source)