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, catchAllIO )
61 import Directory ( doesFileExist, removeFile )
62 import IOExts ( IORef, readIORef, writeIORef )
63 import Monad ( when, unless )
64 import System ( ExitCode(..), exitWith, getEnv, system )
69 #include "../includes/config.h"
71 #ifndef mingw32_TARGET_OS
72 import qualified Posix
74 import List ( isPrefixOf )
78 -- This is a kludge for bootstrapping with 4.08.X. Given that
79 -- all distributed compilers >= 5.0 will be compiled with themselves.
80 -- I don't think this kludge is a problem. And we have to start
81 -- building with >= 5.0 on Win32 anyway.
82 #if __GLASGOW_HASKELL__ > 408
83 -- use the line below when we can be sure of compiling with GHC >=
84 -- 5.02, and remove the implementation of rawSystem at the end of this
86 import PrelIOBase -- this can be removed when SystemExts is used
87 import CError ( throwErrnoIfMinus1 ) -- as can this
88 -- import SystemExts ( rawSystem )
90 import System ( system )
93 #include "HsVersions.h"
98 The configuration story
99 ~~~~~~~~~~~~~~~~~~~~~~~
101 GHC needs various support files (library packages, RTS etc), plus
102 various auxiliary programs (cp, gcc, etc). It finds these in one
105 * When running as an *installed program*, GHC finds most of this support
106 stuff in the installed library tree. The path to this tree is passed
107 to GHC via the -B flag, and given to initSysTools .
109 * When running *in-place* in a build tree, GHC finds most of this support
110 stuff in the build tree. The path to the build tree is, again passed
113 GHC tells which of the two is the case by seeing whether package.conf
114 is in TopDir [installed] or in TopDir/ghc/driver [inplace] (what a hack).
117 SysTools.initSysProgs figures out exactly where all the auxiliary programs
118 are, and initialises mutable variables to make it easy to call them.
119 To to this, it makes use of definitions in Config.hs, which is a Haskell
120 file containing variables whose value is figured out by the build system.
122 Config.hs contains two sorts of things
124 cGCC, The *names* of the programs
127 etc They do *not* include paths
130 cUNLIT_DIR The *path* to the directory containing unlit, split etc
131 cSPLIT_DIR *relative* to the root of the build tree,
132 for use when running *in-place* in a build tree (only)
136 ---------------------------------------------
137 NOTES for an ALTERNATIVE scheme (i.e *not* what is currently implemented):
139 Another hair-brained scheme for simplifying the current tool location
140 nightmare in GHC: Simon originally suggested using another
141 configuration file along the lines of GCC's specs file - which is fine
142 except that it means adding code to read yet another configuration
143 file. What I didn't notice is that the current package.conf is
144 general enough to do this:
147 {name = "tools", import_dirs = [], source_dirs = [],
148 library_dirs = [], hs_libraries = [], extra_libraries = [],
149 include_dirs = [], c_includes = [], package_deps = [],
150 extra_ghc_opts = ["-pgmc/usr/bin/gcc","-pgml${libdir}/bin/unlit", ... etc.],
151 extra_cc_opts = [], extra_ld_opts = []}
153 Which would have the advantage that we get to collect together in one
154 place the path-specific package stuff with the path-specific tool
157 ---------------------------------------------
160 %************************************************************************
162 \subsection{Global variables to contain system programs}
164 %************************************************************************
166 All these pathnames are maintained IN THE NATIVE FORMAT OF THE HOST MACHINE.
167 (See remarks under pathnames below)
170 GLOBAL_VAR(v_Pgm_L, error "pgm_L", String) -- unlit
171 GLOBAL_VAR(v_Pgm_P, error "pgm_P", String) -- cpp
172 GLOBAL_VAR(v_Pgm_c, error "pgm_c", String) -- gcc
173 GLOBAL_VAR(v_Pgm_m, error "pgm_m", String) -- asm code mangler
174 GLOBAL_VAR(v_Pgm_s, error "pgm_s", String) -- asm code splitter
175 GLOBAL_VAR(v_Pgm_a, error "pgm_a", String) -- as
177 GLOBAL_VAR(v_Pgm_I, error "pgm_I", String) -- ilx2il
178 GLOBAL_VAR(v_Pgm_i, error "pgm_i", String) -- ilasm
180 GLOBAL_VAR(v_Pgm_l, error "pgm_l", String) -- ld
181 GLOBAL_VAR(v_Pgm_MkDLL, error "pgm_dll", String) -- mkdll
183 GLOBAL_VAR(v_Pgm_T, error "pgm_T", String) -- touch
184 GLOBAL_VAR(v_Pgm_CP, error "pgm_CP", String) -- cp
186 GLOBAL_VAR(v_Path_package_config, error "path_package_config", String)
187 GLOBAL_VAR(v_Path_usage, error "ghc_usage.txt", String)
189 GLOBAL_VAR(v_TopDir, error "TopDir", String) -- -B<dir>
191 -- Parallel system only
192 GLOBAL_VAR(v_Pgm_sysman, error "pgm_sysman", String) -- system manager
194 -- ways to get at some of these variables from outside this module
195 getPackageConfigPath = readIORef v_Path_package_config
196 getTopDir = readIORef v_TopDir
200 %************************************************************************
202 \subsection{Initialisation}
204 %************************************************************************
207 initSysTools :: [String] -- Command-line arguments starting "-B"
209 -> IO () -- Set all the mutable variables above, holding
210 -- (a) the system programs
211 -- (b) the package-config file
212 -- (c) the GHC usage message
215 initSysTools minusB_args
216 = do { (am_installed, top_dir) <- findTopDir minusB_args
217 ; writeIORef v_TopDir top_dir
219 -- for "installed" this is the root of GHC's support files
220 -- for "in-place" it is the root of the build tree
221 -- NB: top_dir is assumed to be in standard Unix format '/' separated
223 ; let installed, installed_bin :: FilePath -> FilePath
224 installed_bin pgm = pgmPath (top_dir `slash` "extra-bin") pgm
225 installed file = pgmPath top_dir file
226 inplace dir pgm = pgmPath (top_dir `slash` dir) pgm
229 | am_installed = installed "package.conf"
230 | otherwise = inplace cGHC_DRIVER_DIR "package.conf.inplace"
233 | am_installed = installed "ghc-usage.txt"
234 | otherwise = inplace cGHC_DRIVER_DIR "ghc-usage.txt"
236 -- For all systems, unlit, split, mangle are GHC utilities
237 -- architecture-specific stuff is done when building Config.hs
239 | am_installed = installed_bin cGHC_UNLIT
240 | otherwise = inplace cGHC_UNLIT_DIR cGHC_UNLIT
242 -- split and mangle are Perl scripts
244 | am_installed = installed_bin cGHC_SPLIT
245 | otherwise = inplace cGHC_SPLIT_DIR cGHC_SPLIT
248 | am_installed = installed_bin cGHC_MANGLER
249 | otherwise = inplace cGHC_MANGLER_DIR cGHC_MANGLER
251 #ifndef mingw32_TARGET_OS
252 -- check whether TMPDIR is set in the environment
253 ; IO.try (do dir <- getEnv "TMPDIR" -- fails if not set
258 -- On Win32, consult GetTempPath() for a temp dir.
259 -- => it first tries TMP, TEMP, then finally the
260 -- Windows directory(!). The directory is in short-path
261 -- form and *does* have a trailing backslash.
263 let len = (2048::Int)
264 buf <- mallocArray len
265 ret <- getTempPath len buf
268 -- failed, consult TEMP.
269 destructArray len buf
273 destructArray len buf
276 -- strip the trailing backslash (awful, but
277 -- we only do this once).
286 -- Check that the package config exists
287 ; config_exists <- doesFileExist pkgconfig_path
288 ; when (not config_exists) $
289 throwDyn (InstallationError
290 ("Can't find package.conf as " ++ pkgconfig_path))
292 #if defined(mingw32_TARGET_OS)
293 -- WINDOWS-SPECIFIC STUFF
294 -- On Windows, gcc and friends are distributed with GHC,
295 -- so when "installed" we look in TopDir/bin
296 -- When "in-place" we look wherever the build-time configure
298 -- When "install" we tell gcc where its specs file + exes are (-B)
299 -- and also some places to pick up include files. We need
300 -- to be careful to put all necessary exes in the -B place
301 -- (as, ld, cc1, etc) since if they don't get found there, gcc
302 -- then tries to run unadorned "as", "ld", etc, and will
303 -- pick up whatever happens to be lying around in the path,
304 -- possibly including those from a cygwin install on the target,
305 -- which is exactly what we're trying to avoid.
306 ; let gcc_path | am_installed = installed_bin ("gcc -B\"" ++ installed "gcc-lib/\"")
308 -- The trailing "/" is absolutely essential; gcc seems
309 -- to construct file names simply by concatenating to this
310 -- -B path with no extra slash
311 -- We use "/" rather than "\\" because otherwise "\\\" is mangled
312 -- later on; although gcc_path is in NATIVE format, gcc can cope
313 -- (see comments with declarations of global variables)
315 -- The quotes round the -B argument are in case TopDir has spaces in it
317 perl_path | am_installed = installed_bin cGHC_PERL
318 | otherwise = cGHC_PERL
320 -- 'touch' is a GHC util for Windows, and similarly unlit, mangle
321 ; let touch_path | am_installed = installed_bin cGHC_TOUCHY
322 | otherwise = inplace cGHC_TOUCHY_DIR cGHC_TOUCHY
324 -- On Win32 we don't want to rely on #!/bin/perl, so we prepend
325 -- a call to Perl to get the invocation of split and mangle
326 ; let split_path = perl_path ++ " \"" ++ split_script ++ "\""
327 mangle_path = perl_path ++ " \"" ++ mangle_script ++ "\""
329 ; let mkdll_path = cMKDLL
331 -- UNIX-SPECIFIC STUFF
332 -- On Unix, the "standard" tools are assumed to be
333 -- in the same place whether we are running "in-place" or "installed"
334 -- That place is wherever the build-time configure script found them.
335 ; let gcc_path = cGCC
336 touch_path = cGHC_TOUCHY
337 mkdll_path = panic "Can't build DLLs on a non-Win32 system"
339 -- On Unix, scripts are invoked using the '#!' method. Binary
340 -- installations of GHC on Unix place the correct line on the front
341 -- of the script at installation time, so we don't want to wire-in
342 -- our knowledge of $(PERL) on the host system here.
343 ; let split_path = split_script
344 mangle_path = mangle_script
347 -- cpp is derived from gcc on all platforms
348 ; let cpp_path = gcc_path ++ " -E " ++ cRAWCPP_FLAGS
350 -- For all systems, copy and remove are provided by the host
351 -- system; architecture-specific stuff is done when building Config.hs
352 ; let cp_path = cGHC_CP
354 -- Other things being equal, as and ld are simply gcc
355 ; let as_path = gcc_path
359 -- ilx2il and ilasm are specified in Config.hs
360 ; let ilx2il_path = cILX2IL
364 -- Initialise the global vars
365 ; writeIORef v_Path_package_config pkgconfig_path
366 ; writeIORef v_Path_usage ghc_usage_msg_path
368 ; writeIORef v_Pgm_sysman (top_dir ++ "/ghc/rts/parallel/SysMan")
369 -- Hans: this isn't right in general, but you can
370 -- elaborate it in the same way as the others
372 ; writeIORef v_Pgm_L unlit_path
373 ; writeIORef v_Pgm_P cpp_path
374 ; writeIORef v_Pgm_c gcc_path
375 ; writeIORef v_Pgm_m mangle_path
376 ; writeIORef v_Pgm_s split_path
377 ; writeIORef v_Pgm_a as_path
379 ; writeIORef v_Pgm_I ilx2il_path
380 ; writeIORef v_Pgm_i ilasm_path
382 ; writeIORef v_Pgm_l ld_path
383 ; writeIORef v_Pgm_MkDLL mkdll_path
384 ; writeIORef v_Pgm_T touch_path
385 ; writeIORef v_Pgm_CP cp_path
390 #if defined(mingw32_TARGET_OS)
391 foreign import stdcall "GetTempPathA" getTempPath :: Int -> CString -> IO Int32
395 setPgm is called when a command-line option like
397 is used to override a particular program with a new one
400 setPgm :: String -> IO ()
401 -- The string is the flag, minus the '-pgm' prefix
402 -- So the first character says which program to override
404 setPgm ('P' : pgm) = writeIORef v_Pgm_P pgm
405 setPgm ('c' : pgm) = writeIORef v_Pgm_c pgm
406 setPgm ('m' : pgm) = writeIORef v_Pgm_m pgm
407 setPgm ('s' : pgm) = writeIORef v_Pgm_s pgm
408 setPgm ('a' : pgm) = writeIORef v_Pgm_a pgm
409 setPgm ('l' : pgm) = writeIORef v_Pgm_l pgm
411 setPgm ('I' : pgm) = writeIORef v_Pgm_I pgm
412 setPgm ('i' : pgm) = writeIORef v_Pgm_i pgm
414 setPgm pgm = unknownFlagErr ("-pgm" ++ pgm)
420 -- for "installed" this is the root of GHC's support files
421 -- for "in-place" it is the root of the build tree
424 -- 1. Set proto_top_dir
425 -- a) look for (the last) -B flag, and use it
426 -- b) if there are no -B flags, get the directory
427 -- where GHC is running (only on Windows)
429 -- 2. If package.conf exists in proto_top_dir, we are running
430 -- installed; and TopDir = proto_top_dir
432 -- 3. Otherwise we are running in-place, so
433 -- proto_top_dir will be /...stuff.../ghc/compiler
434 -- Set TopDir to /...stuff..., which is the root of the build tree
436 -- This is very gruesome indeed
438 findTopDir :: [String]
439 -> IO (Bool, -- True <=> am installed, False <=> in-place
440 String) -- TopDir (in Unix format '/' separated)
443 = do { top_dir <- get_proto
444 -- Discover whether we're running in a build tree or in an installation,
445 -- by looking for the package configuration file.
446 ; am_installed <- doesFileExist (top_dir `slash` "package.conf")
448 ; return (am_installed, top_dir)
451 -- get_proto returns a Unix-format path (relying on getExecDir to do so too)
452 get_proto | not (null minusbs)
453 = return (unDosifyPath (drop 2 (last minusbs))) -- 2 for "-B"
455 = do { maybe_exec_dir <- getExecDir -- Get directory of executable
456 ; case maybe_exec_dir of -- (only works on Windows;
457 -- returns Nothing on Unix)
458 Nothing -> throwDyn (InstallationError "missing -B<dir> option")
459 Just dir -> return dir
464 %************************************************************************
466 \subsection{Command-line options}
468 %************************************************************************
470 When invoking external tools as part of the compilation pipeline, we
471 pass these a sequence of options on the command-line. Rather than
472 just using a list of Strings, we use a type that allows us to distinguish
473 between filepaths and 'other stuff'. [The reason being, of course, that
474 this type gives us a handle on transforming filenames, and filenames only,
475 to whatever format they're expected to be on a particular platform.]
479 = FileOption -- an entry that _contains_ filename(s) / filepaths.
480 String -- a non-filepath prefix that shouldn't be transformed (e.g., "/out="
481 String -- the filepath/filename portion
484 showOptions :: [Option] -> String
485 showOptions ls = unwords (map (quote.showOpt) ls)
487 showOpt (FileOption pre f) = pre ++ dosifyPath f
488 showOpt (Option s) = s
490 #if defined(mingw32_TARGET_OS)
492 quote s = "\"" ++ s ++ "\""
500 %************************************************************************
502 \subsection{Running an external program}
504 %************************************************************************
508 runUnlit :: [Option] -> IO ()
509 runUnlit args = do p <- readIORef v_Pgm_L
510 runSomething "Literate pre-processor" p args
512 runCpp :: [Option] -> IO ()
513 runCpp args = do p <- readIORef v_Pgm_P
514 runSomething "C pre-processor" p args
516 runCc :: [Option] -> IO ()
517 runCc args = do p <- readIORef v_Pgm_c
518 runSomething "C Compiler" p args
520 runMangle :: [Option] -> IO ()
521 runMangle args = do p <- readIORef v_Pgm_m
522 runSomething "Mangler" p args
524 runSplit :: [Option] -> IO ()
525 runSplit args = do p <- readIORef v_Pgm_s
526 runSomething "Splitter" p args
528 runAs :: [Option] -> IO ()
529 runAs args = do p <- readIORef v_Pgm_a
530 runSomething "Assembler" p args
532 runLink :: [Option] -> IO ()
533 runLink args = do p <- readIORef v_Pgm_l
534 runSomething "Linker" p args
537 runIlx2il :: [Option] -> IO ()
538 runIlx2il args = do p <- readIORef v_Pgm_I
539 runSomething "Ilx2Il" p args
541 runIlasm :: [Option] -> IO ()
542 runIlasm args = do p <- readIORef v_Pgm_i
543 runSomething "Ilasm" p args
546 runMkDLL :: [Option] -> IO ()
547 runMkDLL args = do p <- readIORef v_Pgm_MkDLL
548 runSomething "Make DLL" p args
550 touch :: String -> String -> IO ()
551 touch purpose arg = do p <- readIORef v_Pgm_T
552 runSomething purpose p [FileOption "" arg]
554 copy :: String -> String -> String -> IO ()
555 copy purpose from to = do
556 verb <- dynFlag verbosity
557 when (verb >= 2) $ hPutStrLn stderr ("*** " ++ purpose)
559 h <- openFile to WriteMode
560 ls <- readFile from -- inefficient, but it'll do for now.
561 -- ToDo: speed up via slurping.
567 getSysMan :: IO String -- How to invoke the system manager
568 -- (parallel system only)
569 getSysMan = readIORef v_Pgm_sysman
572 %************************************************************************
574 \subsection{GHC Usage message}
576 %************************************************************************
578 Show the usage message and exit
581 showGhcUsage = do { usage_path <- readIORef v_Path_usage
582 ; usage <- readFile usage_path
584 ; exitWith ExitSuccess }
587 dump ('$':'$':s) = hPutStr stderr progName >> dump s
588 dump (c:s) = hPutChar stderr c >> dump s
592 %************************************************************************
594 \subsection{Managing temporary files
596 %************************************************************************
599 GLOBAL_VAR(v_FilesToClean, [], [String] )
600 GLOBAL_VAR(v_TmpDir, cDEFAULT_TMPDIR, String )
601 -- v_TmpDir has no closing '/'
605 setTmpDir dir = writeIORef v_TmpDir dir
607 cleanTempFiles :: Int -> IO ()
608 cleanTempFiles verb = do fs <- readIORef v_FilesToClean
609 removeTmpFiles verb fs
611 cleanTempFilesExcept :: Int -> [FilePath] -> IO ()
612 cleanTempFilesExcept verb dont_delete
613 = do fs <- readIORef v_FilesToClean
614 let leftovers = filter (`notElem` dont_delete) fs
615 removeTmpFiles verb leftovers
616 writeIORef v_FilesToClean dont_delete
619 -- find a temporary name that doesn't already exist.
620 newTempName :: Suffix -> IO FilePath
622 = do x <- getProcessID
623 tmp_dir <- readIORef v_TmpDir
624 findTempName tmp_dir x
626 findTempName tmp_dir x
627 = do let filename = tmp_dir ++ "/ghc" ++ show x ++ '.':extn
628 b <- doesFileExist filename
629 if b then findTempName tmp_dir (x+1)
630 else do add v_FilesToClean filename -- clean it up later
633 addFilesToClean :: [FilePath] -> IO ()
634 -- May include wildcards [used by DriverPipeline.run_phase SplitMangle]
635 addFilesToClean files = mapM_ (add v_FilesToClean) files
637 removeTmpFiles :: Int -> [FilePath] -> IO ()
638 removeTmpFiles verb fs
639 = traceCmd "Deleting temp files"
640 ("Deleting: " ++ unwords fs)
643 rm f = removeFile f `catchAllIO`
646 hPutStrLn stderr ("Warning: deleting non-existent " ++ f)
652 %************************************************************************
654 \subsection{Running a program}
656 %************************************************************************
659 GLOBAL_VAR(v_Dry_run, False, Bool)
662 setDryRun = writeIORef v_Dry_run True
664 -----------------------------------------------------------------------------
665 -- Running an external program
667 runSomething :: String -- For -v message
668 -> String -- Command name (possibly a full path)
669 -- assumed already dos-ified
670 -> [Option] -- Arguments
671 -- runSomething will dos-ify them
674 runSomething phase_name pgm args
675 = traceCmd phase_name cmd_line $
677 #ifndef mingw32_TARGET_OS
678 exit_code <- system cmd_line
680 exit_code <- rawSystem cmd_line
682 ; if exit_code /= ExitSuccess
683 then throwDyn (PhaseFailed phase_name exit_code)
687 cmd_line = pgm ++ ' ':showOptions args -- unwords (pgm : dosifyPaths (map quote args))
688 -- The pgm is already in native format (appropriate dir separators)
689 #if defined(mingw32_TARGET_OS)
691 quote s = "\"" ++ s ++ "\""
696 traceCmd :: String -> String -> IO () -> IO ()
697 -- a) trace the command (at two levels of verbosity)
698 -- b) don't do it at all if dry-run is set
699 traceCmd phase_name cmd_line action
700 = do { verb <- dynFlag verbosity
701 ; when (verb >= 2) $ hPutStrLn stderr ("*** " ++ phase_name)
702 ; when (verb >= 3) $ hPutStrLn stderr cmd_line
706 ; n <- readIORef v_Dry_run
710 ; action `catchAllIO` handle_exn verb
713 handle_exn verb exn = do { when (verb >= 2) (hPutStr stderr "\n")
714 ; when (verb >= 3) (hPutStrLn stderr ("Failed: " ++ cmd_line))
715 ; throwDyn (PhaseFailed phase_name (ExitFailure 1)) }
719 %************************************************************************
721 \subsection{Path names}
723 %************************************************************************
725 We maintain path names in Unix form ('/'-separated) right until
726 the last moment. On Windows we dos-ify them just before passing them
727 to the Windows command.
729 The alternative, of using '/' consistently on Unix and '\' on Windows,
730 proved quite awkward. There were a lot more calls to dosifyPath,
731 and even on Windows we might invoke a unix-like utility (eg 'sh'), which
732 interpreted a command line 'foo\baz' as 'foobaz'.
735 -----------------------------------------------------------------------------
736 -- Convert filepath into MSDOS form.
738 dosifyPaths :: [String] -> [String]
739 -- dosifyPaths does two things
740 -- a) change '/' to '\'
741 -- b) remove initial '/cygdrive/'
743 unDosifyPath :: String -> String
744 -- Just change '\' to '/'
746 pgmPath :: String -- Directory string in Unix format
747 -> String -- Program name with no directory separators
749 -> String -- Program invocation string in native format
753 #if defined(mingw32_TARGET_OS)
755 --------------------- Windows version ------------------
756 dosifyPaths xs = map dosifyPath xs
758 unDosifyPath xs = subst '\\' '/' xs
760 pgmPath dir pgm = dosifyPath dir ++ '\\' : pgm
763 = subst '/' '\\' real_stuff
765 -- fully convince myself that /cygdrive/ prefixes cannot
766 -- really appear here.
767 cygdrive_prefix = "/cygdrive/"
770 | cygdrive_prefix `isPrefixOf` stuff = drop (length cygdrive_prefix) stuff
775 --------------------- Unix version ---------------------
778 pgmPath dir pgm = dir ++ '/' : pgm
779 dosifyPath stuff = stuff
780 --------------------------------------------------------
783 subst a b ls = map (\ x -> if x == a then b else x) ls
787 -----------------------------------------------------------------------------
788 Path name construction
791 slash :: String -> String -> String
792 absPath, relPath :: [String] -> String
795 relPath xs = foldr1 slash xs
797 absPath xs = "" `slash` relPath xs
799 slash s1 s2 = s1 ++ ('/' : s2)
803 %************************************************************************
805 \subsection{Support code}
807 %************************************************************************
810 -----------------------------------------------------------------------------
811 -- Define getExecDir :: IO (Maybe String)
813 #if defined(mingw32_TARGET_OS)
814 getExecDir :: IO (Maybe String)
815 getExecDir = do let len = (2048::Int) -- plenty, PATH_MAX is 512 under Win32.
816 buf <- mallocArray len
817 ret <- getModuleFileName nullAddr buf len
818 if ret == 0 then destructArray len buf >> return Nothing
819 else do s <- peekCString buf
820 destructArray len buf
821 return (Just (reverse (drop (length "/bin/ghc.exe") (reverse (unDosifyPath s)))))
824 foreign import stdcall "GetModuleFileNameA" getModuleFileName :: Addr -> CString -> Int -> IO Int32
826 getExecDir :: IO (Maybe String) = do return Nothing
829 #ifdef mingw32_TARGET_OS
830 foreign import "_getpid" getProcessID :: IO Int -- relies on Int == Int32 on Windows
832 getProcessID :: IO Int
833 getProcessID = Posix.getProcessID
836 rawSystem :: String -> IO ExitCode
837 #if __GLASGOW_HASKELL__ > 408
838 rawSystem "" = ioException (IOError Nothing InvalidArgument "rawSystem" "null command" Nothing)
840 withCString cmd $ \s -> do
841 status <- throwErrnoIfMinus1 "rawSystem" (primRawSystem s)
843 0 -> return ExitSuccess
844 n -> return (ExitFailure n)
846 foreign import ccall "rawSystemCmd" unsafe primRawSystem :: CString -> IO Int
848 rawSystem = System.system