Setup.hs

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import Distribution.Simple
import Distribution.Simple.Setup
import Distribution.Simple.LocalBuildInfo
import Distribution.Simple.Program.Db
import Distribution.Simple.Program.GHC
import Distribution.Simple.Program.Builtin
import Distribution.Simple.Program.Types
import Distribution.Verbosity (verbose)
import Distribution.PackageDescription

import Control.Monad (unless)
import System.Exit (ExitCode(..))
import System.FilePath (replaceExtension)
import System.Process (readProcessWithExitCode)

main = defaultMainWithHooks simpleUserHooks{ buildHook = buildH }

-- | Custom build hook that builds C-sources for benchmarks with x-cc-name set.
buildH :: PackageDescription -> LocalBuildInfo -> UserHooks -> BuildFlags -> IO ()
buildH pd lbi user_hooks flags = do
    benchmarks' <- mapM (checkIfAndCompile lbi) $ benchmarks pd
    -- Build the remaining things the regular way.
    buildHook simpleUserHooks pd{ benchmarks = benchmarks' } lbi user_hooks flags
    return ()

-- | Checks if x-cc-name is set, and compiles c-sources with that compiler name.
checkIfAndCompile :: LocalBuildInfo -> Benchmark -> IO Benchmark
checkIfAndCompile lbi bench = do
    let bench_bi  = benchmarkBuildInfo bench
    case lookup "x-cc-name" $ customFieldsBI bench_bi of
        Nothing -> return bench
        Just cc_name  -> do
            let c_srcs    = cSources bench_bi
                cc_opts   = ccOptions bench_bi
                inc_dirs  = includeDirs bench_bi
            -- Compile C/C++ sources
            putStrLn "Invoking icc compiler"
            mapM_ (compile lbi bench cc_name cc_opts inc_dirs) c_srcs
            -- Remove C source code from the hooked build (don't change libs)
            return $ bench{ benchmarkBuildInfo = bench_bi{ cSources = [] } }

-- | Compiles a C file with the given options.
compile :: LocalBuildInfo -> Benchmark -> String -> [String] -> [String] -> FilePath -> IO ()
compile lbi bench cc_name opts inc_dirs srcfile = do
    let args = [ "-optc -std=c99"
               , "-optc -Wall"
               , "-w"
               , "-c"
               , "-pgmc " ++ cc_name
               ] ++ map ("-optc " ++) opts
        objfile = replaceExtension srcfile "o"
        fullargs = args ++ ["-o", objfile, srcfile]
    (ghcProg,_) <- requireProgram verbose ghcProgram (withPrograms lbi)
    let ghc = programPath ghcProg
    print $ unwords $ ["Calling:",ghc] ++ fullargs
    (ex, stdout, stderr) <- readProcessWithExitCode ghc fullargs ""
    case ex of
      ExitFailure{} -> error $ unlines [show ex, stdout, stderr]
      _ -> do let output = stdout ++ stderr
              unless (null output) $ putStrLn output