-- Copyright 2012-2013 Samplecount S.L.
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.

{-|
Description: Toolchain definitions and utilities for Linux

This module provides toolchain definitions and utilities for targeting Linux.
See "Development.Shake.Language.C.Rules" for examples of how to use a target
toolchain.

Linux is also a supported host operating system, see
"Development.Shake.Language.C.Host" for examples of how to target the host.
-}

module Development.Shake.Language.C.Target.Linux (
    toolChain
  , getDefaultToolChain
) where

import Data.Label (get, set)
import Development.Shake
import Development.Shake.Language.C.BuildFlags
import Development.Shake.Language.C.Target
import Development.Shake.Language.C.ToolChain
import System.Process (readProcess)

getHostArch :: IO Arch
getHostArch = do
    arch <- fmap (head.lines) $ readProcess "arch" [] ""
    return $ case arch of
        "i386" -> X86 I386
        "i686" -> X86 I686
        "x86_64" -> X86 X86_64
        _ -> error $ "Unknown host architecture " ++ arch

target :: Arch -> Target
target = Target Linux (Platform "linux")

platformArchiver :: Archiver
platformArchiver tc buildFlags inputs output = do
    need inputs
    command_ [] (tool tc archiverCommand)
      $  ["cr"]
      ++ get archiverFlags buildFlags
      ++ [output]
      ++ inputs
    command_ [] (toolFromString tc "ranlib") [output]

-- | Linux toolchain.
toolChain :: ToolChainVariant -> ToolChain
toolChain GCC =
    set variant GCC
  $ set compilerCommand "gcc"
  $ set archiverCommand "ar"
  $ set archiver platformArchiver
  $ set linkerCommand "g++"
  $ defaultToolChain
toolChain LLVM =
    set variant LLVM
  $ set compilerCommand "gcc"
  $ set archiverCommand "ar"
  $ set linkerCommand "g++"
  $ defaultToolChain
toolChain Generic = toolChain GCC

getDefaultToolChain :: IO (Target, Action ToolChain)
getDefaultToolChain = do
    t <- fmap target getHostArch
    return (t, return $ toolChain GCC)