+ traceCmd dflags phase_name (unwords (pgm:real_args)) $ do
+ (exit_code, doesn'tExist) <-
+ IO.catch (do
+ rc <- builderMainLoop dflags pgm real_args
+ case rc of
+ ExitSuccess{} -> return (rc, False)
+ ExitFailure n
+ -- rawSystem returns (ExitFailure 127) if the exec failed for any
+ -- reason (eg. the program doesn't exist). This is the only clue
+ -- we have, but we need to report something to the user because in
+ -- the case of a missing program there will otherwise be no output
+ -- at all.
+ | n == 127 -> return (rc, True)
+ | otherwise -> return (rc, False))
+ -- Should 'rawSystem' generate an IO exception indicating that
+ -- 'pgm' couldn't be run rather than a funky return code, catch
+ -- this here (the win32 version does this, but it doesn't hurt
+ -- to test for this in general.)
+ (\ err ->
+ if IO.isDoesNotExistError err
+#if defined(mingw32_HOST_OS) && __GLASGOW_HASKELL__ < 604
+ -- the 'compat' version of rawSystem under mingw32 always
+ -- maps 'errno' to EINVAL to failure.
+ || case (ioeGetErrorType err ) of { InvalidArgument{} -> True ; _ -> False}
+#endif
+ then return (ExitFailure 1, True)
+ else IO.ioError err)
+ case (doesn'tExist, exit_code) of
+ (True, _) -> throwDyn (InstallationError ("could not execute: " ++ pgm))
+ (_, ExitSuccess) -> return ()
+ _ -> throwDyn (PhaseFailed phase_name exit_code)
+
+
+
+#if __GLASGOW_HASKELL__ < 603
+builderMainLoop dflags pgm real_args = do
+ rawSystem pgm real_args
+#else
+builderMainLoop dflags pgm real_args = do
+ chan <- newChan
+ (hStdIn, hStdOut, hStdErr, hProcess) <- runInteractiveProcess pgm real_args Nothing Nothing
+
+ -- and run a loop piping the output from the compiler to the log_action in DynFlags
+ hSetBuffering hStdOut LineBuffering
+ hSetBuffering hStdErr LineBuffering
+ forkIO (readerProc chan hStdOut)
+ forkIO (readerProc chan hStdErr)
+ rc <- loop chan hProcess 2 1 ExitSuccess
+ hClose hStdIn
+ hClose hStdOut
+ hClose hStdErr
+ return rc
+ where
+ -- status starts at zero, and increments each time either
+ -- a reader process gets EOF, or the build proc exits. We wait
+ -- for all of these to happen (status==3).
+ -- ToDo: we should really have a contingency plan in case any of
+ -- the threads dies, such as a timeout.
+ loop chan hProcess 0 0 exitcode = return exitcode
+ loop chan hProcess t p exitcode = do
+ mb_code <- if p > 0
+ then getProcessExitCode hProcess
+ else return Nothing
+ case mb_code of
+ Just code -> loop chan hProcess t (p-1) code
+ Nothing
+ | t > 0 -> do
+ msg <- readChan chan
+ case msg of
+ BuildMsg msg -> do
+ log_action dflags SevInfo noSrcSpan defaultUserStyle msg
+ loop chan hProcess t p exitcode
+ BuildError loc msg -> do
+ log_action dflags SevError (mkSrcSpan loc loc) defaultUserStyle msg
+ loop chan hProcess t p exitcode
+ EOF ->
+ loop chan hProcess (t-1) p exitcode
+ | otherwise -> loop chan hProcess t p exitcode
+
+readerProc chan hdl = loop Nothing `catch` \e -> writeChan chan EOF
+ -- ToDo: check errors more carefully
+ where
+ loop in_err = do
+ l <- hGetLine hdl `catch` \e -> do
+ case in_err of
+ Just err -> writeChan chan err
+ Nothing -> return ()
+ ioError e
+ case in_err of
+ Just err@(BuildError srcLoc msg)
+ | leading_whitespace l -> do
+ loop (Just (BuildError srcLoc (msg $$ text l)))
+ | otherwise -> do
+ writeChan chan err
+ checkError l
+ Nothing -> do
+ checkError l
+
+ checkError l
+ = case matchRegex errRegex l of
+ Nothing -> do
+ writeChan chan (BuildMsg (text l))
+ loop Nothing
+ Just (file':lineno':colno':msg:_) -> do
+ let file = mkFastString file'
+ lineno = read lineno'::Int
+ colno = case colno' of
+ "" -> 0
+ _ -> read (init colno') :: Int
+ srcLoc = mkSrcLoc file lineno colno
+ loop (Just (BuildError srcLoc (text msg)))
+
+ leading_whitespace [] = False
+ leading_whitespace (x:_) = isSpace x
+
+errRegex = mkRegex "^([^:]*):([0-9]+):([0-9]+:)?(.*)"
+
+data BuildMessage
+ = BuildMsg !SDoc
+ | BuildError !SrcLoc !SDoc
+ | EOF
+#endif
+
+showOpt (FileOption pre f) = pre ++ platformPath f
+showOpt (Option "") = ""
+showOpt (Option s) = s