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

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
    (_, stdout, stderr) <- readProcessWithExitCode ghc fullargs ""
    let output = stdout ++ stderr
    unless (null output) $ putStrLn output