module Rscons
  class CC < Builder
    def self.default_variables(env)
      {
        'CC' => 'gcc',
        'CFLAGS' => [],
        'CPPFLAGS' => [],
        'OBJSUFFIX' => '.o',
        'CSUFFIX' => '.c',
        'CCDEPGEN' => ['-MMD', '-MF', '$DEPFILE'],
        'CCCOM' => ['$CC', '-c', '-o', '$TARGET', '$CCDEPGEN', '$CPPFLAGS', '$CFLAGS', '$SOURCES']
      }
    end

    def self.produces?(env, target, source)
      (env['OBJSUFFIX', :array].find {|os| target =~ /#{os}$/} and
       env['CSUFFIX', :array].find {|cs| source =~ /#{cs}$/})
    end

    def run(env, target, source)
      raise "String expected, not #{source.inspect}" unless source.is_a?(String)
      unless Cache.open.up_to_date?(target, [source])
        vars = {
          'TARGET' => target,
          'SOURCES' => source,
          'DEPFILE' => env.stem(target) + '.mf',
        }
        env.execute("CC #{target}", env['CCCOM'], vars)
        deps = [source]
        if File.exists?(vars['DEPFILE'])
          deps += env.parse_makefile_deps(vars['DEPFILE'], target)
          FileUtils.rm_f(vars['DEPFILE'])
        end
        Cache.open.register_build(target, deps.uniq)
      end
      target
    end
  end
end