1 -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow 2001
5 -- Access to system tools: gcc, cp, rm etc
7 -----------------------------------------------------------------------------
13 setPgm, -- String -> IO ()
14 -- Command-line override
17 getTopDir, -- IO String -- The value of $libdir
18 getPackageConfigPath, -- IO String -- Where package.conf is
20 -- Interface to system tools
21 runUnlit, runCpp, runCc, -- [Option] -> IO ()
22 runMangle, runSplit, -- [Option] -> IO ()
23 runAs, runLink, -- [Option] -> IO ()
26 runIlx2il, runIlasm, -- [String] -> IO ()
30 touch, -- String -> String -> IO ()
31 copy, -- String -> String -> String -> IO ()
32 unDosifyPath, -- String -> String
34 -- Temporary-file management
37 cleanTempFiles, cleanTempFilesExcept, removeTmpFiles,
41 getProcessID, -- IO Int
42 system, -- String -> IO ExitCode
45 showGhcUsage, -- IO () Shows usage message and exits
46 getSysMan, -- IO String Parallel system only
55 import Panic ( progName, GhcException(..) )
56 import Util ( global )
57 import CmdLineOpts ( dynFlag, verbosity )
59 import Exception ( throwDyn )
60 #if __GLASGOW_HASKELL__ > 408
61 import qualified Exception ( catch )
63 import Exception ( catchAllIO )
66 import Directory ( doesFileExist, removeFile )
67 import IOExts ( IORef, readIORef, writeIORef )
68 import Monad ( when, unless )
69 import System ( ExitCode(..), exitWith, getEnv, system )
74 #include "../includes/config.h"
76 #ifndef mingw32_TARGET_OS
77 import qualified Posix
79 import List ( isPrefixOf )
83 -- This is a kludge for bootstrapping with 4.08.X. Given that
84 -- all distributed compilers >= 5.0 will be compiled with themselves.
85 -- I don't think this kludge is a problem. And we have to start
86 -- building with >= 5.0 on Win32 anyway.
87 #if __GLASGOW_HASKELL__ > 408
88 -- use the line below when we can be sure of compiling with GHC >=
89 -- 5.02, and remove the implementation of rawSystem at the end of this
91 import PrelIOBase -- this can be removed when SystemExts is used
92 import CError ( throwErrnoIfMinus1 ) -- as can this
93 -- import SystemExts ( rawSystem )
95 import System ( system )
99 #include "HsVersions.h"
101 -- Make catch work on older GHCs
102 #if __GLASGOW_HASKELL__ > 408
103 myCatch = Exception.catch
111 The configuration story
112 ~~~~~~~~~~~~~~~~~~~~~~~
114 GHC needs various support files (library packages, RTS etc), plus
115 various auxiliary programs (cp, gcc, etc). It finds these in one
118 * When running as an *installed program*, GHC finds most of this support
119 stuff in the installed library tree. The path to this tree is passed
120 to GHC via the -B flag, and given to initSysTools .
122 * When running *in-place* in a build tree, GHC finds most of this support
123 stuff in the build tree. The path to the build tree is, again passed
126 GHC tells which of the two is the case by seeing whether package.conf
127 is in TopDir [installed] or in TopDir/ghc/driver [inplace] (what a hack).
130 SysTools.initSysProgs figures out exactly where all the auxiliary programs
131 are, and initialises mutable variables to make it easy to call them.
132 To to this, it makes use of definitions in Config.hs, which is a Haskell
133 file containing variables whose value is figured out by the build system.
135 Config.hs contains two sorts of things
137 cGCC, The *names* of the programs
140 etc They do *not* include paths
143 cUNLIT_DIR The *path* to the directory containing unlit, split etc
144 cSPLIT_DIR *relative* to the root of the build tree,
145 for use when running *in-place* in a build tree (only)
149 ---------------------------------------------
150 NOTES for an ALTERNATIVE scheme (i.e *not* what is currently implemented):
152 Another hair-brained scheme for simplifying the current tool location
153 nightmare in GHC: Simon originally suggested using another
154 configuration file along the lines of GCC's specs file - which is fine
155 except that it means adding code to read yet another configuration
156 file. What I didn't notice is that the current package.conf is
157 general enough to do this:
160 {name = "tools", import_dirs = [], source_dirs = [],
161 library_dirs = [], hs_libraries = [], extra_libraries = [],
162 include_dirs = [], c_includes = [], package_deps = [],
163 extra_ghc_opts = ["-pgmc/usr/bin/gcc","-pgml${libdir}/bin/unlit", ... etc.],
164 extra_cc_opts = [], extra_ld_opts = []}
166 Which would have the advantage that we get to collect together in one
167 place the path-specific package stuff with the path-specific tool
170 ---------------------------------------------
173 %************************************************************************
175 \subsection{Global variables to contain system programs}
177 %************************************************************************
179 All these pathnames are maintained IN THE NATIVE FORMAT OF THE HOST MACHINE.
180 (See remarks under pathnames below)
183 GLOBAL_VAR(v_Pgm_L, error "pgm_L", String) -- unlit
184 GLOBAL_VAR(v_Pgm_P, error "pgm_P", String) -- cpp
185 GLOBAL_VAR(v_Pgm_c, error "pgm_c", String) -- gcc
186 GLOBAL_VAR(v_Pgm_m, error "pgm_m", String) -- asm code mangler
187 GLOBAL_VAR(v_Pgm_s, error "pgm_s", String) -- asm code splitter
188 GLOBAL_VAR(v_Pgm_a, error "pgm_a", String) -- as
190 GLOBAL_VAR(v_Pgm_I, error "pgm_I", String) -- ilx2il
191 GLOBAL_VAR(v_Pgm_i, error "pgm_i", String) -- ilasm
193 GLOBAL_VAR(v_Pgm_l, error "pgm_l", String) -- ld
194 GLOBAL_VAR(v_Pgm_MkDLL, error "pgm_dll", String) -- mkdll
196 GLOBAL_VAR(v_Pgm_T, error "pgm_T", String) -- touch
197 GLOBAL_VAR(v_Pgm_CP, error "pgm_CP", String) -- cp
199 GLOBAL_VAR(v_Path_package_config, error "path_package_config", String)
200 GLOBAL_VAR(v_Path_usage, error "ghc_usage.txt", String)
202 GLOBAL_VAR(v_TopDir, error "TopDir", String) -- -B<dir>
204 -- Parallel system only
205 GLOBAL_VAR(v_Pgm_sysman, error "pgm_sysman", String) -- system manager
207 -- ways to get at some of these variables from outside this module
208 getPackageConfigPath = readIORef v_Path_package_config
209 getTopDir = readIORef v_TopDir
213 %************************************************************************
215 \subsection{Initialisation}
217 %************************************************************************
220 initSysTools :: [String] -- Command-line arguments starting "-B"
222 -> IO () -- Set all the mutable variables above, holding
223 -- (a) the system programs
224 -- (b) the package-config file
225 -- (c) the GHC usage message
228 initSysTools minusB_args
229 = do { (am_installed, top_dir) <- findTopDir minusB_args
230 ; writeIORef v_TopDir top_dir
232 -- for "installed" this is the root of GHC's support files
233 -- for "in-place" it is the root of the build tree
234 -- NB: top_dir is assumed to be in standard Unix format '/' separated
236 ; let installed, installed_bin :: FilePath -> FilePath
237 installed_bin pgm = pgmPath top_dir pgm
238 installed file = pgmPath top_dir file
239 inplace dir pgm = pgmPath (top_dir `slash` dir) pgm
242 | am_installed = installed "package.conf"
243 | otherwise = inplace cGHC_DRIVER_DIR "package.conf.inplace"
246 | am_installed = installed "ghc-usage.txt"
247 | otherwise = inplace cGHC_DRIVER_DIR "ghc-usage.txt"
249 -- For all systems, unlit, split, mangle are GHC utilities
250 -- architecture-specific stuff is done when building Config.hs
252 | am_installed = installed_bin cGHC_UNLIT
253 | otherwise = inplace cGHC_UNLIT_DIR cGHC_UNLIT
255 -- split and mangle are Perl scripts
257 | am_installed = installed_bin cGHC_SPLIT
258 | otherwise = inplace cGHC_SPLIT_DIR cGHC_SPLIT
261 | am_installed = installed_bin cGHC_MANGLER
262 | otherwise = inplace cGHC_MANGLER_DIR cGHC_MANGLER
264 #ifndef mingw32_TARGET_OS
265 -- check whether TMPDIR is set in the environment
266 ; IO.try (do dir <- getEnv "TMPDIR" -- fails if not set
271 -- On Win32, consult GetTempPath() for a temp dir.
272 -- => it first tries TMP, TEMP, then finally the
273 -- Windows directory(!). The directory is in short-path
274 -- form and *does* have a trailing backslash.
276 let len = (2048::Int)
277 buf <- mallocArray len
278 ret <- getTempPath len buf
281 -- failed, consult TEMP.
282 destructArray len buf
286 destructArray len buf
289 -- strip the trailing backslash (awful, but
290 -- we only do this once).
300 -- Check that the package config exists
301 ; config_exists <- doesFileExist pkgconfig_path
302 ; when (not config_exists) $
303 throwDyn (InstallationError
304 ("Can't find package.conf as " ++ pkgconfig_path))
306 #if defined(mingw32_TARGET_OS)
307 -- WINDOWS-SPECIFIC STUFF
308 -- On Windows, gcc and friends are distributed with GHC,
309 -- so when "installed" we look in TopDir/bin
310 -- When "in-place" we look wherever the build-time configure
312 -- When "install" we tell gcc where its specs file + exes are (-B)
313 -- and also some places to pick up include files. We need
314 -- to be careful to put all necessary exes in the -B place
315 -- (as, ld, cc1, etc) since if they don't get found there, gcc
316 -- then tries to run unadorned "as", "ld", etc, and will
317 -- pick up whatever happens to be lying around in the path,
318 -- possibly including those from a cygwin install on the target,
319 -- which is exactly what we're trying to avoid.
320 ; let gcc_path | am_installed = installed_bin ("gcc -B\"" ++ installed "gcc-lib/\"")
322 -- The trailing "/" is absolutely essential; gcc seems
323 -- to construct file names simply by concatenating to this
324 -- -B path with no extra slash
325 -- We use "/" rather than "\\" because otherwise "\\\" is mangled
326 -- later on; although gcc_path is in NATIVE format, gcc can cope
327 -- (see comments with declarations of global variables)
329 -- The quotes round the -B argument are in case TopDir has spaces in it
331 perl_path | am_installed = installed_bin cGHC_PERL
332 | otherwise = cGHC_PERL
334 -- 'touch' is a GHC util for Windows, and similarly unlit, mangle
335 ; let touch_path | am_installed = installed_bin cGHC_TOUCHY
336 | otherwise = inplace cGHC_TOUCHY_DIR cGHC_TOUCHY
338 -- On Win32 we don't want to rely on #!/bin/perl, so we prepend
339 -- a call to Perl to get the invocation of split and mangle
340 ; let split_path = perl_path ++ " \"" ++ split_script ++ "\""
341 mangle_path = perl_path ++ " \"" ++ mangle_script ++ "\""
343 ; let mkdll_path = cMKDLL
345 -- UNIX-SPECIFIC STUFF
346 -- On Unix, the "standard" tools are assumed to be
347 -- in the same place whether we are running "in-place" or "installed"
348 -- That place is wherever the build-time configure script found them.
349 ; let gcc_path = cGCC
350 touch_path = cGHC_TOUCHY
351 mkdll_path = panic "Can't build DLLs on a non-Win32 system"
353 -- On Unix, scripts are invoked using the '#!' method. Binary
354 -- installations of GHC on Unix place the correct line on the front
355 -- of the script at installation time, so we don't want to wire-in
356 -- our knowledge of $(PERL) on the host system here.
357 ; let split_path = split_script
358 mangle_path = mangle_script
361 -- cpp is derived from gcc on all platforms
362 ; let cpp_path = gcc_path ++ " -E " ++ cRAWCPP_FLAGS
364 -- For all systems, copy and remove are provided by the host
365 -- system; architecture-specific stuff is done when building Config.hs
366 ; let cp_path = cGHC_CP
368 -- Other things being equal, as and ld are simply gcc
369 ; let as_path = gcc_path
373 -- ilx2il and ilasm are specified in Config.hs
374 ; let ilx2il_path = cILX2IL
378 -- Initialise the global vars
379 ; writeIORef v_Path_package_config pkgconfig_path
380 ; writeIORef v_Path_usage ghc_usage_msg_path
382 ; writeIORef v_Pgm_sysman (top_dir ++ "/ghc/rts/parallel/SysMan")
383 -- Hans: this isn't right in general, but you can
384 -- elaborate it in the same way as the others
386 ; writeIORef v_Pgm_L unlit_path
387 ; writeIORef v_Pgm_P cpp_path
388 ; writeIORef v_Pgm_c gcc_path
389 ; writeIORef v_Pgm_m mangle_path
390 ; writeIORef v_Pgm_s split_path
391 ; writeIORef v_Pgm_a as_path
393 ; writeIORef v_Pgm_I ilx2il_path
394 ; writeIORef v_Pgm_i ilasm_path
396 ; writeIORef v_Pgm_l ld_path
397 ; writeIORef v_Pgm_MkDLL mkdll_path
398 ; writeIORef v_Pgm_T touch_path
399 ; writeIORef v_Pgm_CP cp_path
404 #if defined(mingw32_TARGET_OS)
405 foreign import stdcall "GetTempPathA" getTempPath :: Int -> CString -> IO Int32
409 setPgm is called when a command-line option like
411 is used to override a particular program with a new one
414 setPgm :: String -> IO ()
415 -- The string is the flag, minus the '-pgm' prefix
416 -- So the first character says which program to override
418 setPgm ('P' : pgm) = writeIORef v_Pgm_P pgm
419 setPgm ('c' : pgm) = writeIORef v_Pgm_c pgm
420 setPgm ('m' : pgm) = writeIORef v_Pgm_m pgm
421 setPgm ('s' : pgm) = writeIORef v_Pgm_s pgm
422 setPgm ('a' : pgm) = writeIORef v_Pgm_a pgm
423 setPgm ('l' : pgm) = writeIORef v_Pgm_l pgm
425 setPgm ('I' : pgm) = writeIORef v_Pgm_I pgm
426 setPgm ('i' : pgm) = writeIORef v_Pgm_i pgm
428 setPgm pgm = unknownFlagErr ("-pgm" ++ pgm)
434 -- for "installed" this is the root of GHC's support files
435 -- for "in-place" it is the root of the build tree
438 -- 1. Set proto_top_dir
439 -- a) look for (the last) -B flag, and use it
440 -- b) if there are no -B flags, get the directory
441 -- where GHC is running (only on Windows)
443 -- 2. If package.conf exists in proto_top_dir, we are running
444 -- installed; and TopDir = proto_top_dir
446 -- 3. Otherwise we are running in-place, so
447 -- proto_top_dir will be /...stuff.../ghc/compiler
448 -- Set TopDir to /...stuff..., which is the root of the build tree
450 -- This is very gruesome indeed
452 findTopDir :: [String]
453 -> IO (Bool, -- True <=> am installed, False <=> in-place
454 String) -- TopDir (in Unix format '/' separated)
457 = do { top_dir <- get_proto
458 -- Discover whether we're running in a build tree or in an installation,
459 -- by looking for the package configuration file.
460 ; am_installed <- doesFileExist (top_dir `slash` "package.conf")
462 ; return (am_installed, top_dir)
465 -- get_proto returns a Unix-format path (relying on getExecDir to do so too)
466 get_proto | not (null minusbs)
467 = return (unDosifyPath (drop 2 (last minusbs))) -- 2 for "-B"
469 = do { maybe_exec_dir <- getExecDir -- Get directory of executable
470 ; case maybe_exec_dir of -- (only works on Windows;
471 -- returns Nothing on Unix)
472 Nothing -> throwDyn (InstallationError "missing -B<dir> option")
473 Just dir -> return dir
478 %************************************************************************
480 \subsection{Command-line options}
482 %************************************************************************
484 When invoking external tools as part of the compilation pipeline, we
485 pass these a sequence of options on the command-line. Rather than
486 just using a list of Strings, we use a type that allows us to distinguish
487 between filepaths and 'other stuff'. [The reason being, of course, that
488 this type gives us a handle on transforming filenames, and filenames only,
489 to whatever format they're expected to be on a particular platform.]
493 = FileOption -- an entry that _contains_ filename(s) / filepaths.
494 String -- a non-filepath prefix that shouldn't be transformed (e.g., "/out="
495 String -- the filepath/filename portion
498 showOptions :: [Option] -> String
499 showOptions ls = unwords (map (quote.showOpt) ls)
501 showOpt (FileOption pre f) = pre ++ dosifyPath f
502 showOpt (Option s) = s
504 #if defined(mingw32_TARGET_OS)
506 quote s = "\"" ++ s ++ "\""
514 %************************************************************************
516 \subsection{Running an external program}
518 %************************************************************************
522 runUnlit :: [Option] -> IO ()
523 runUnlit args = do p <- readIORef v_Pgm_L
524 runSomething "Literate pre-processor" p args
526 runCpp :: [Option] -> IO ()
527 runCpp args = do p <- readIORef v_Pgm_P
528 runSomething "C pre-processor" p args
530 runCc :: [Option] -> IO ()
531 runCc args = do p <- readIORef v_Pgm_c
532 runSomething "C Compiler" p args
534 runMangle :: [Option] -> IO ()
535 runMangle args = do p <- readIORef v_Pgm_m
536 runSomething "Mangler" p args
538 runSplit :: [Option] -> IO ()
539 runSplit args = do p <- readIORef v_Pgm_s
540 runSomething "Splitter" p args
542 runAs :: [Option] -> IO ()
543 runAs args = do p <- readIORef v_Pgm_a
544 runSomething "Assembler" p args
546 runLink :: [Option] -> IO ()
547 runLink args = do p <- readIORef v_Pgm_l
548 runSomething "Linker" p args
551 runIlx2il :: [Option] -> IO ()
552 runIlx2il args = do p <- readIORef v_Pgm_I
553 runSomething "Ilx2Il" p args
555 runIlasm :: [Option] -> IO ()
556 runIlasm args = do p <- readIORef v_Pgm_i
557 runSomething "Ilasm" p args
560 runMkDLL :: [Option] -> IO ()
561 runMkDLL args = do p <- readIORef v_Pgm_MkDLL
562 runSomething "Make DLL" p args
564 touch :: String -> String -> IO ()
565 touch purpose arg = do p <- readIORef v_Pgm_T
566 runSomething purpose p [FileOption "" arg]
568 copy :: String -> String -> String -> IO ()
569 copy purpose from to = do
570 verb <- dynFlag verbosity
571 when (verb >= 2) $ hPutStrLn stderr ("*** " ++ purpose)
573 h <- openFile to WriteMode
574 ls <- readFile from -- inefficient, but it'll do for now.
575 -- ToDo: speed up via slurping.
581 getSysMan :: IO String -- How to invoke the system manager
582 -- (parallel system only)
583 getSysMan = readIORef v_Pgm_sysman
586 %************************************************************************
588 \subsection{GHC Usage message}
590 %************************************************************************
592 Show the usage message and exit
595 showGhcUsage = do { usage_path <- readIORef v_Path_usage
596 ; usage <- readFile usage_path
598 ; exitWith ExitSuccess }
601 dump ('$':'$':s) = hPutStr stderr progName >> dump s
602 dump (c:s) = hPutChar stderr c >> dump s
606 %************************************************************************
608 \subsection{Managing temporary files
610 %************************************************************************
613 GLOBAL_VAR(v_FilesToClean, [], [String] )
614 GLOBAL_VAR(v_TmpDir, cDEFAULT_TMPDIR, String )
615 -- v_TmpDir has no closing '/'
619 setTmpDir dir = writeIORef v_TmpDir dir
621 cleanTempFiles :: Int -> IO ()
622 cleanTempFiles verb = do fs <- readIORef v_FilesToClean
623 removeTmpFiles verb fs
625 cleanTempFilesExcept :: Int -> [FilePath] -> IO ()
626 cleanTempFilesExcept verb dont_delete
627 = do fs <- readIORef v_FilesToClean
628 let leftovers = filter (`notElem` dont_delete) fs
629 removeTmpFiles verb leftovers
630 writeIORef v_FilesToClean dont_delete
633 -- find a temporary name that doesn't already exist.
634 newTempName :: Suffix -> IO FilePath
636 = do x <- getProcessID
637 tmp_dir <- readIORef v_TmpDir
638 findTempName tmp_dir x
640 findTempName tmp_dir x
641 = do let filename = tmp_dir ++ "/ghc" ++ show x ++ '.':extn
642 b <- doesFileExist filename
643 if b then findTempName tmp_dir (x+1)
644 else do add v_FilesToClean filename -- clean it up later
647 addFilesToClean :: [FilePath] -> IO ()
648 -- May include wildcards [used by DriverPipeline.run_phase SplitMangle]
649 addFilesToClean files = mapM_ (add v_FilesToClean) files
651 removeTmpFiles :: Int -> [FilePath] -> IO ()
652 removeTmpFiles verb fs
653 = traceCmd "Deleting temp files"
654 ("Deleting: " ++ unwords fs)
657 rm f = removeFile f `myCatch`
660 hPutStrLn stderr ("Warning: deleting non-existent " ++ f)
666 %************************************************************************
668 \subsection{Running a program}
670 %************************************************************************
673 GLOBAL_VAR(v_Dry_run, False, Bool)
676 setDryRun = writeIORef v_Dry_run True
678 -----------------------------------------------------------------------------
679 -- Running an external program
681 runSomething :: String -- For -v message
682 -> String -- Command name (possibly a full path)
683 -- assumed already dos-ified
684 -> [Option] -- Arguments
685 -- runSomething will dos-ify them
688 runSomething phase_name pgm args
689 = traceCmd phase_name cmd_line $
691 #ifndef mingw32_TARGET_OS
692 exit_code <- system cmd_line
694 exit_code <- rawSystem cmd_line
696 ; if exit_code /= ExitSuccess
697 then throwDyn (PhaseFailed phase_name exit_code)
701 cmd_line = pgm ++ ' ':showOptions args -- unwords (pgm : dosifyPaths (map quote args))
702 -- The pgm is already in native format (appropriate dir separators)
703 #if defined(mingw32_TARGET_OS)
705 quote s = "\"" ++ s ++ "\""
710 traceCmd :: String -> String -> IO () -> IO ()
711 -- a) trace the command (at two levels of verbosity)
712 -- b) don't do it at all if dry-run is set
713 traceCmd phase_name cmd_line action
714 = do { verb <- dynFlag verbosity
715 ; when (verb >= 2) $ hPutStrLn stderr ("*** " ++ phase_name)
716 ; when (verb >= 3) $ hPutStrLn stderr cmd_line
720 ; n <- readIORef v_Dry_run
724 ; action `myCatch` handle_exn verb
727 handle_exn verb exn = do { when (verb >= 2) (hPutStr stderr "\n")
728 ; when (verb >= 3) (hPutStrLn stderr ("Failed: " ++ cmd_line))
729 ; throwDyn (PhaseFailed phase_name (ExitFailure 1)) }
733 %************************************************************************
735 \subsection{Path names}
737 %************************************************************************
739 We maintain path names in Unix form ('/'-separated) right until
740 the last moment. On Windows we dos-ify them just before passing them
741 to the Windows command.
743 The alternative, of using '/' consistently on Unix and '\' on Windows,
744 proved quite awkward. There were a lot more calls to dosifyPath,
745 and even on Windows we might invoke a unix-like utility (eg 'sh'), which
746 interpreted a command line 'foo\baz' as 'foobaz'.
749 -----------------------------------------------------------------------------
750 -- Convert filepath into MSDOS form.
752 dosifyPaths :: [String] -> [String]
753 -- dosifyPaths does two things
754 -- a) change '/' to '\'
755 -- b) remove initial '/cygdrive/'
757 unDosifyPath :: String -> String
758 -- Just change '\' to '/'
760 pgmPath :: String -- Directory string in Unix format
761 -> String -- Program name with no directory separators
763 -> String -- Program invocation string in native format
767 #if defined(mingw32_TARGET_OS)
769 --------------------- Windows version ------------------
770 dosifyPaths xs = map dosifyPath xs
772 unDosifyPath xs = subst '\\' '/' xs
774 pgmPath dir pgm = dosifyPath dir ++ '\\' : pgm
777 = subst '/' '\\' real_stuff
779 -- fully convince myself that /cygdrive/ prefixes cannot
780 -- really appear here.
781 cygdrive_prefix = "/cygdrive/"
784 | cygdrive_prefix `isPrefixOf` stuff = drop (length cygdrive_prefix) stuff
789 --------------------- Unix version ---------------------
792 pgmPath dir pgm = dir ++ '/' : pgm
793 dosifyPath stuff = stuff
794 --------------------------------------------------------
797 subst a b ls = map (\ x -> if x == a then b else x) ls
801 -----------------------------------------------------------------------------
802 Path name construction
805 slash :: String -> String -> String
806 absPath, relPath :: [String] -> String
809 relPath xs = foldr1 slash xs
811 absPath xs = "" `slash` relPath xs
813 slash s1 s2 = s1 ++ ('/' : s2)
817 %************************************************************************
819 \subsection{Support code}
821 %************************************************************************
824 -----------------------------------------------------------------------------
825 -- Define getExecDir :: IO (Maybe String)
827 #if defined(mingw32_TARGET_OS)
828 getExecDir :: IO (Maybe String)
829 getExecDir = do let len = (2048::Int) -- plenty, PATH_MAX is 512 under Win32.
830 buf <- mallocArray len
831 ret <- getModuleFileName nullAddr buf len
832 if ret == 0 then destructArray len buf >> return Nothing
833 else do s <- peekCString buf
834 destructArray len buf
835 return (Just (reverse (drop (length "/bin/ghc.exe") (reverse (unDosifyPath s)))))
838 foreign import stdcall "GetModuleFileNameA" getModuleFileName :: Addr -> CString -> Int -> IO Int32
840 getExecDir :: IO (Maybe String) = do return Nothing
843 #ifdef mingw32_TARGET_OS
844 foreign import "_getpid" getProcessID :: IO Int -- relies on Int == Int32 on Windows
846 getProcessID :: IO Int
847 getProcessID = Posix.getProcessID
850 rawSystem :: String -> IO ExitCode
851 #if __GLASGOW_HASKELL__ > 408
852 rawSystem "" = ioException (IOError Nothing InvalidArgument "rawSystem" "null command" Nothing)
854 withCString cmd $ \s -> do
855 status <- throwErrnoIfMinus1 "rawSystem" (primRawSystem s)
857 0 -> return ExitSuccess
858 n -> return (ExitFailure n)
860 foreign import ccall "rawSystemCmd" unsafe primRawSystem :: CString -> IO Int
862 rawSystem = System.system