1 -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow 2001
5 -- Access to system tools: gcc, cp, rm etc
7 -----------------------------------------------------------------------------
14 setPgmP, -- String -> IO ()
25 -- Command-line override
28 getTopDir, -- IO String -- The value of $libdir
29 getPackageConfigPath, -- IO String -- Where package.conf is
31 -- Interface to system tools
32 runUnlit, runCpp, runCc, -- [Option] -> IO ()
33 runPp, -- [Option] -> IO ()
34 runMangle, runSplit, -- [Option] -> IO ()
35 runAs, runLink, -- [Option] -> IO ()
38 runIlx2il, runIlasm, -- [String] -> IO ()
42 touch, -- String -> String -> IO ()
43 copy, -- String -> String -> String -> IO ()
44 unDosifyPath, -- String -> String
46 -- Temporary-file management
49 cleanTempFiles, cleanTempFilesExcept, removeTmpFiles,
53 getProcessID, -- IO Int
54 system, -- String -> IO ExitCode
57 showGhcUsage, -- IO () Shows usage message and exits
58 getSysMan, -- IO String Parallel system only
67 import Panic ( progName, GhcException(..) )
68 import Util ( global, dropList )
69 import CmdLineOpts ( dynFlag, verbosity )
71 import Exception ( throwDyn )
72 #if __GLASGOW_HASKELL__ > 408
73 import qualified Exception ( catch )
75 import Exception ( catchAllIO )
78 import Directory ( doesFileExist, removeFile )
79 import IOExts ( IORef, readIORef, writeIORef )
80 import Monad ( when, unless )
81 import System ( ExitCode(..), exitWith, getEnv, system )
86 #include "../includes/config.h"
88 #ifndef mingw32_TARGET_OS
89 import qualified Posix
91 import List ( isPrefixOf )
96 #if __GLASGOW_HASKELL__ > 408
97 # if __GLASGOW_HASKELL__ >= 503
101 # ifdef mingw32_TARGET_OS
102 import SystemExts ( rawSystem )
105 import System ( system )
109 #include "HsVersions.h"
111 -- Make catch work on older GHCs
112 #if __GLASGOW_HASKELL__ > 408
113 myCatch = Exception.catch
121 The configuration story
122 ~~~~~~~~~~~~~~~~~~~~~~~
124 GHC needs various support files (library packages, RTS etc), plus
125 various auxiliary programs (cp, gcc, etc). It finds these in one
128 * When running as an *installed program*, GHC finds most of this support
129 stuff in the installed library tree. The path to this tree is passed
130 to GHC via the -B flag, and given to initSysTools .
132 * When running *in-place* in a build tree, GHC finds most of this support
133 stuff in the build tree. The path to the build tree is, again passed
136 GHC tells which of the two is the case by seeing whether package.conf
137 is in TopDir [installed] or in TopDir/ghc/driver [inplace] (what a hack).
140 SysTools.initSysProgs figures out exactly where all the auxiliary programs
141 are, and initialises mutable variables to make it easy to call them.
142 To to this, it makes use of definitions in Config.hs, which is a Haskell
143 file containing variables whose value is figured out by the build system.
145 Config.hs contains two sorts of things
147 cGCC, The *names* of the programs
150 etc They do *not* include paths
153 cUNLIT_DIR_REL The *path* to the directory containing unlit, split etc
154 cSPLIT_DIR_REL *relative* to the root of the build tree,
155 for use when running *in-place* in a build tree (only)
159 ---------------------------------------------
160 NOTES for an ALTERNATIVE scheme (i.e *not* what is currently implemented):
162 Another hair-brained scheme for simplifying the current tool location
163 nightmare in GHC: Simon originally suggested using another
164 configuration file along the lines of GCC's specs file - which is fine
165 except that it means adding code to read yet another configuration
166 file. What I didn't notice is that the current package.conf is
167 general enough to do this:
170 {name = "tools", import_dirs = [], source_dirs = [],
171 library_dirs = [], hs_libraries = [], extra_libraries = [],
172 include_dirs = [], c_includes = [], package_deps = [],
173 extra_ghc_opts = ["-pgmc/usr/bin/gcc","-pgml${libdir}/bin/unlit", ... etc.],
174 extra_cc_opts = [], extra_ld_opts = []}
176 Which would have the advantage that we get to collect together in one
177 place the path-specific package stuff with the path-specific tool
180 ---------------------------------------------
183 %************************************************************************
185 \subsection{Global variables to contain system programs}
187 %************************************************************************
189 All these pathnames are maintained IN THE NATIVE FORMAT OF THE HOST MACHINE.
190 (See remarks under pathnames below)
193 GLOBAL_VAR(v_Pgm_L, error "pgm_L", String) -- unlit
194 GLOBAL_VAR(v_Pgm_P, error "pgm_P", String) -- cpp
195 GLOBAL_VAR(v_Pgm_F, error "pgm_F", String) -- pp
196 GLOBAL_VAR(v_Pgm_c, error "pgm_c", String) -- gcc
197 GLOBAL_VAR(v_Pgm_m, error "pgm_m", String) -- asm code mangler
198 GLOBAL_VAR(v_Pgm_s, error "pgm_s", String) -- asm code splitter
199 GLOBAL_VAR(v_Pgm_a, error "pgm_a", String) -- as
201 GLOBAL_VAR(v_Pgm_I, error "pgm_I", String) -- ilx2il
202 GLOBAL_VAR(v_Pgm_i, error "pgm_i", String) -- ilasm
204 GLOBAL_VAR(v_Pgm_l, error "pgm_l", String) -- ld
205 GLOBAL_VAR(v_Pgm_MkDLL, error "pgm_dll", String) -- mkdll
207 GLOBAL_VAR(v_Pgm_T, error "pgm_T", String) -- touch
208 GLOBAL_VAR(v_Pgm_CP, error "pgm_CP", String) -- cp
210 GLOBAL_VAR(v_Path_package_config, error "path_package_config", String)
211 GLOBAL_VAR(v_Path_usage, error "ghc_usage.txt", String)
213 GLOBAL_VAR(v_TopDir, error "TopDir", String) -- -B<dir>
215 -- Parallel system only
216 GLOBAL_VAR(v_Pgm_sysman, error "pgm_sysman", String) -- system manager
218 -- ways to get at some of these variables from outside this module
219 getPackageConfigPath = readIORef v_Path_package_config
220 getTopDir = readIORef v_TopDir
224 %************************************************************************
226 \subsection{Initialisation}
228 %************************************************************************
231 initSysTools :: [String] -- Command-line arguments starting "-B"
233 -> IO () -- Set all the mutable variables above, holding
234 -- (a) the system programs
235 -- (b) the package-config file
236 -- (c) the GHC usage message
239 initSysTools minusB_args
240 = do { (am_installed, top_dir) <- findTopDir minusB_args
241 ; writeIORef v_TopDir top_dir
243 -- for "installed" this is the root of GHC's support files
244 -- for "in-place" it is the root of the build tree
245 -- NB: top_dir is assumed to be in standard Unix format '/' separated
247 ; let installed, installed_bin :: FilePath -> FilePath
248 installed_bin pgm = pgmPath top_dir pgm
249 installed file = pgmPath top_dir file
250 inplace dir pgm = pgmPath (top_dir `slash`
251 cPROJECT_DIR `slash` dir) pgm
254 | am_installed = installed "package.conf"
255 | otherwise = inplace cGHC_DRIVER_DIR_REL "package.conf.inplace"
258 | am_installed = installed "ghc-usage.txt"
259 | otherwise = inplace cGHC_DRIVER_DIR_REL "ghc-usage.txt"
261 -- For all systems, unlit, split, mangle are GHC utilities
262 -- architecture-specific stuff is done when building Config.hs
264 | am_installed = installed_bin cGHC_UNLIT_PGM
265 | otherwise = inplace cGHC_UNLIT_DIR_REL cGHC_UNLIT_PGM
267 -- split and mangle are Perl scripts
269 | am_installed = installed_bin cGHC_SPLIT_PGM
270 | otherwise = inplace cGHC_SPLIT_DIR_REL cGHC_SPLIT_PGM
273 | am_installed = installed_bin cGHC_MANGLER_PGM
274 | otherwise = inplace cGHC_MANGLER_DIR_REL cGHC_MANGLER_PGM
276 #ifndef mingw32_TARGET_OS
277 -- check whether TMPDIR is set in the environment
278 ; IO.try (do dir <- getEnv "TMPDIR" -- fails if not set
283 -- On Win32, consult GetTempPath() for a temp dir.
284 -- => it first tries TMP, TEMP, then finally the
285 -- Windows directory(!). The directory is in short-path
286 -- form and *does* have a trailing backslash.
288 let len = (2048::Int)
289 buf <- mallocArray len
290 ret <- getTempPath len buf
293 -- failed, consult TEMP.
301 -- strip the trailing backslash (awful, but
302 -- we only do this once).
312 -- Check that the package config exists
313 ; config_exists <- doesFileExist pkgconfig_path
314 ; when (not config_exists) $
315 throwDyn (InstallationError
316 ("Can't find package.conf as " ++ pkgconfig_path))
318 #if defined(mingw32_TARGET_OS)
319 -- WINDOWS-SPECIFIC STUFF
320 -- On Windows, gcc and friends are distributed with GHC,
321 -- so when "installed" we look in TopDir/bin
322 -- When "in-place" we look wherever the build-time configure
324 -- When "install" we tell gcc where its specs file + exes are (-B)
325 -- and also some places to pick up include files. We need
326 -- to be careful to put all necessary exes in the -B place
327 -- (as, ld, cc1, etc) since if they don't get found there, gcc
328 -- then tries to run unadorned "as", "ld", etc, and will
329 -- pick up whatever happens to be lying around in the path,
330 -- possibly including those from a cygwin install on the target,
331 -- which is exactly what we're trying to avoid.
332 ; let gcc_path | am_installed = installed_bin ("gcc -B\"" ++ installed "gcc-lib/\"")
334 -- The trailing "/" is absolutely essential; gcc seems
335 -- to construct file names simply by concatenating to this
336 -- -B path with no extra slash
337 -- We use "/" rather than "\\" because otherwise "\\\" is mangled
338 -- later on; although gcc_path is in NATIVE format, gcc can cope
339 -- (see comments with declarations of global variables)
341 -- The quotes round the -B argument are in case TopDir has spaces in it
343 perl_path | am_installed = installed_bin cGHC_PERL
344 | otherwise = cGHC_PERL
346 -- 'touch' is a GHC util for Windows, and similarly unlit, mangle
347 ; let touch_path | am_installed = installed_bin cGHC_TOUCHY_PGM
348 | otherwise = inplace cGHC_TOUCHY_DIR_REL cGHC_TOUCHY_PGM
350 -- On Win32 we don't want to rely on #!/bin/perl, so we prepend
351 -- a call to Perl to get the invocation of split and mangle
352 ; let split_path = perl_path ++ " \"" ++ split_script ++ "\""
353 mangle_path = perl_path ++ " \"" ++ mangle_script ++ "\""
355 ; let mkdll_path = cMKDLL
357 -- UNIX-SPECIFIC STUFF
358 -- On Unix, the "standard" tools are assumed to be
359 -- in the same place whether we are running "in-place" or "installed"
360 -- That place is wherever the build-time configure script found them.
361 ; let gcc_path = cGCC
363 mkdll_path = panic "Can't build DLLs on a non-Win32 system"
365 -- On Unix, scripts are invoked using the '#!' method. Binary
366 -- installations of GHC on Unix place the correct line on the front
367 -- of the script at installation time, so we don't want to wire-in
368 -- our knowledge of $(PERL) on the host system here.
369 ; let split_path = split_script
370 mangle_path = mangle_script
373 -- cpp is derived from gcc on all platforms
374 ; let cpp_path = gcc_path ++ " -E " ++ cRAWCPP_FLAGS
376 -- For all systems, copy and remove are provided by the host
377 -- system; architecture-specific stuff is done when building Config.hs
378 ; let cp_path = cGHC_CP
380 -- Other things being equal, as and ld are simply gcc
381 ; let as_path = gcc_path
385 -- ilx2il and ilasm are specified in Config.hs
386 ; let ilx2il_path = cILX2IL
390 -- Initialise the global vars
391 ; writeIORef v_Path_package_config pkgconfig_path
392 ; writeIORef v_Path_usage ghc_usage_msg_path
394 ; writeIORef v_Pgm_sysman (top_dir ++ "/ghc/rts/parallel/SysMan")
395 -- Hans: this isn't right in general, but you can
396 -- elaborate it in the same way as the others
398 ; writeIORef v_Pgm_L unlit_path
399 ; writeIORef v_Pgm_P cpp_path
400 ; writeIORef v_Pgm_F ""
401 ; writeIORef v_Pgm_c gcc_path
402 ; writeIORef v_Pgm_m mangle_path
403 ; writeIORef v_Pgm_s split_path
404 ; writeIORef v_Pgm_a as_path
406 ; writeIORef v_Pgm_I ilx2il_path
407 ; writeIORef v_Pgm_i ilasm_path
409 ; writeIORef v_Pgm_l ld_path
410 ; writeIORef v_Pgm_MkDLL mkdll_path
411 ; writeIORef v_Pgm_T touch_path
412 ; writeIORef v_Pgm_CP cp_path
417 #if defined(mingw32_TARGET_OS)
418 foreign import stdcall "GetTempPathA" unsafe getTempPath :: Int -> CString -> IO Int32
422 The various setPgm functions are called when a command-line option
427 is used to override a particular program with a new one
430 setPgmP = writeIORef v_Pgm_P
431 setPgmF = writeIORef v_Pgm_F
432 setPgmc = writeIORef v_Pgm_c
433 setPgmm = writeIORef v_Pgm_m
434 setPgms = writeIORef v_Pgm_s
435 setPgma = writeIORef v_Pgm_a
436 setPgml = writeIORef v_Pgm_l
438 setPgmI = writeIORef v_Pgm_I
439 setPgmi = writeIORef v_Pgm_i
446 -- for "installed" this is the root of GHC's support files
447 -- for "in-place" it is the root of the build tree
450 -- 1. Set proto_top_dir
451 -- a) look for (the last) -B flag, and use it
452 -- b) if there are no -B flags, get the directory
453 -- where GHC is running (only on Windows)
455 -- 2. If package.conf exists in proto_top_dir, we are running
456 -- installed; and TopDir = proto_top_dir
458 -- 3. Otherwise we are running in-place, so
459 -- proto_top_dir will be /...stuff.../ghc/compiler
460 -- Set TopDir to /...stuff..., which is the root of the build tree
462 -- This is very gruesome indeed
464 findTopDir :: [String]
465 -> IO (Bool, -- True <=> am installed, False <=> in-place
466 String) -- TopDir (in Unix format '/' separated)
469 = do { top_dir <- get_proto
470 -- Discover whether we're running in a build tree or in an installation,
471 -- by looking for the package configuration file.
472 ; am_installed <- doesFileExist (top_dir `slash` "package.conf")
474 ; return (am_installed, top_dir)
477 -- get_proto returns a Unix-format path (relying on getExecDir to do so too)
478 get_proto | not (null minusbs)
479 = return (unDosifyPath (drop 2 (last minusbs))) -- 2 for "-B"
481 = do { maybe_exec_dir <- getExecDir -- Get directory of executable
482 ; case maybe_exec_dir of -- (only works on Windows;
483 -- returns Nothing on Unix)
484 Nothing -> throwDyn (InstallationError "missing -B<dir> option")
485 Just dir -> return dir
490 %************************************************************************
492 \subsection{Command-line options}
494 %************************************************************************
496 When invoking external tools as part of the compilation pipeline, we
497 pass these a sequence of options on the command-line. Rather than
498 just using a list of Strings, we use a type that allows us to distinguish
499 between filepaths and 'other stuff'. [The reason being, of course, that
500 this type gives us a handle on transforming filenames, and filenames only,
501 to whatever format they're expected to be on a particular platform.]
505 = FileOption -- an entry that _contains_ filename(s) / filepaths.
506 String -- a non-filepath prefix that shouldn't be transformed (e.g., "/out="
507 String -- the filepath/filename portion
510 showOptions :: [Option] -> String
511 showOptions ls = unwords (map (quote.showOpt) ls)
513 showOpt (FileOption pre f) = pre ++ dosifyPath f
514 showOpt (Option s) = s
516 #if defined(mingw32_TARGET_OS)
518 quote s = "\"" ++ s ++ "\""
526 %************************************************************************
528 \subsection{Running an external program}
530 %************************************************************************
534 runUnlit :: [Option] -> IO ()
535 runUnlit args = do p <- readIORef v_Pgm_L
536 runSomething "Literate pre-processor" p args
538 runCpp :: [Option] -> IO ()
539 runCpp args = do p <- readIORef v_Pgm_P
540 runSomething "C pre-processor" p args
542 runPp :: [Option] -> IO ()
543 runPp args = do p <- readIORef v_Pgm_F
544 runSomething "Haskell pre-processor" p args
546 runCc :: [Option] -> IO ()
547 runCc args = do p <- readIORef v_Pgm_c
548 runSomething "C Compiler" p args
550 runMangle :: [Option] -> IO ()
551 runMangle args = do p <- readIORef v_Pgm_m
552 runSomething "Mangler" p args
554 runSplit :: [Option] -> IO ()
555 runSplit args = do p <- readIORef v_Pgm_s
556 runSomething "Splitter" p args
558 runAs :: [Option] -> IO ()
559 runAs args = do p <- readIORef v_Pgm_a
560 runSomething "Assembler" p args
562 runLink :: [Option] -> IO ()
563 runLink args = do p <- readIORef v_Pgm_l
564 runSomething "Linker" p args
567 runIlx2il :: [Option] -> IO ()
568 runIlx2il args = do p <- readIORef v_Pgm_I
569 runSomething "Ilx2Il" p args
571 runIlasm :: [Option] -> IO ()
572 runIlasm args = do p <- readIORef v_Pgm_i
573 runSomething "Ilasm" p args
576 runMkDLL :: [Option] -> IO ()
577 runMkDLL args = do p <- readIORef v_Pgm_MkDLL
578 runSomething "Make DLL" p args
580 touch :: String -> String -> IO ()
581 touch purpose arg = do p <- readIORef v_Pgm_T
582 runSomething purpose p [FileOption "" arg]
584 copy :: String -> String -> String -> IO ()
585 copy purpose from to = do
586 verb <- dynFlag verbosity
587 when (verb >= 2) $ hPutStrLn stderr ("*** " ++ purpose)
589 h <- openFile to WriteMode
590 ls <- readFile from -- inefficient, but it'll do for now.
591 -- ToDo: speed up via slurping.
597 getSysMan :: IO String -- How to invoke the system manager
598 -- (parallel system only)
599 getSysMan = readIORef v_Pgm_sysman
602 %************************************************************************
604 \subsection{GHC Usage message}
606 %************************************************************************
608 Show the usage message and exit
611 showGhcUsage = do { usage_path <- readIORef v_Path_usage
612 ; usage <- readFile usage_path
614 ; exitWith ExitSuccess }
617 dump ('$':'$':s) = hPutStr stderr progName >> dump s
618 dump (c:s) = hPutChar stderr c >> dump s
622 %************************************************************************
624 \subsection{Managing temporary files
626 %************************************************************************
629 GLOBAL_VAR(v_FilesToClean, [], [String] )
630 GLOBAL_VAR(v_TmpDir, cDEFAULT_TMPDIR, String )
631 -- v_TmpDir has no closing '/'
635 setTmpDir dir = writeIORef v_TmpDir dir
637 cleanTempFiles :: Int -> IO ()
638 cleanTempFiles verb = do fs <- readIORef v_FilesToClean
639 removeTmpFiles verb fs
641 cleanTempFilesExcept :: Int -> [FilePath] -> IO ()
642 cleanTempFilesExcept verb dont_delete
643 = do fs <- readIORef v_FilesToClean
644 let leftovers = filter (`notElem` dont_delete) fs
645 removeTmpFiles verb leftovers
646 writeIORef v_FilesToClean dont_delete
649 -- find a temporary name that doesn't already exist.
650 newTempName :: Suffix -> IO FilePath
652 = do x <- getProcessID
653 tmp_dir <- readIORef v_TmpDir
654 findTempName tmp_dir x
656 findTempName tmp_dir x
657 = do let filename = tmp_dir ++ "/ghc" ++ show x ++ '.':extn
658 b <- doesFileExist filename
659 if b then findTempName tmp_dir (x+1)
660 else do add v_FilesToClean filename -- clean it up later
663 addFilesToClean :: [FilePath] -> IO ()
664 -- May include wildcards [used by DriverPipeline.run_phase SplitMangle]
665 addFilesToClean files = mapM_ (add v_FilesToClean) files
667 removeTmpFiles :: Int -> [FilePath] -> IO ()
668 removeTmpFiles verb fs
669 = traceCmd "Deleting temp files"
670 ("Deleting: " ++ unwords fs)
673 rm f = removeFile f `myCatch`
676 hPutStrLn stderr ("Warning: deleting non-existent " ++ f)
682 %************************************************************************
684 \subsection{Running a program}
686 %************************************************************************
689 GLOBAL_VAR(v_Dry_run, False, Bool)
692 setDryRun = writeIORef v_Dry_run True
694 -----------------------------------------------------------------------------
695 -- Running an external program
697 runSomething :: String -- For -v message
698 -> String -- Command name (possibly a full path)
699 -- assumed already dos-ified
700 -> [Option] -- Arguments
701 -- runSomething will dos-ify them
704 runSomething phase_name pgm args
705 = traceCmd phase_name cmd_line $
707 #ifndef mingw32_TARGET_OS
708 exit_code <- system cmd_line
710 exit_code <- rawSystem cmd_line
712 ; if exit_code /= ExitSuccess
713 then throwDyn (PhaseFailed phase_name exit_code)
717 cmd_line = pgm ++ ' ':showOptions args -- unwords (pgm : dosifyPaths (map quote args))
718 -- The pgm is already in native format (appropriate dir separators)
719 #if defined(mingw32_TARGET_OS)
721 quote s = "\"" ++ s ++ "\""
726 traceCmd :: String -> String -> IO () -> IO ()
727 -- a) trace the command (at two levels of verbosity)
728 -- b) don't do it at all if dry-run is set
729 traceCmd phase_name cmd_line action
730 = do { verb <- dynFlag verbosity
731 ; when (verb >= 2) $ hPutStrLn stderr ("*** " ++ phase_name)
732 ; when (verb >= 3) $ hPutStrLn stderr cmd_line
736 ; n <- readIORef v_Dry_run
740 ; action `myCatch` handle_exn verb
743 handle_exn verb exn = do { when (verb >= 2) (hPutStr stderr "\n")
744 ; when (verb >= 3) (hPutStrLn stderr ("Failed: " ++ cmd_line))
745 ; throwDyn (PhaseFailed phase_name (ExitFailure 1)) }
749 %************************************************************************
751 \subsection{Path names}
753 %************************************************************************
755 We maintain path names in Unix form ('/'-separated) right until
756 the last moment. On Windows we dos-ify them just before passing them
757 to the Windows command.
759 The alternative, of using '/' consistently on Unix and '\' on Windows,
760 proved quite awkward. There were a lot more calls to dosifyPath,
761 and even on Windows we might invoke a unix-like utility (eg 'sh'), which
762 interpreted a command line 'foo\baz' as 'foobaz'.
765 -----------------------------------------------------------------------------
766 -- Convert filepath into MSDOS form.
768 dosifyPaths :: [String] -> [String]
769 -- dosifyPaths does two things
770 -- a) change '/' to '\'
771 -- b) remove initial '/cygdrive/'
773 unDosifyPath :: String -> String
774 -- Just change '\' to '/'
776 pgmPath :: String -- Directory string in Unix format
777 -> String -- Program name with no directory separators
779 -> String -- Program invocation string in native format
783 #if defined(mingw32_TARGET_OS)
785 --------------------- Windows version ------------------
786 dosifyPaths xs = map dosifyPath xs
788 unDosifyPath xs = subst '\\' '/' xs
790 pgmPath dir pgm = dosifyPath dir ++ '\\' : pgm
793 = subst '/' '\\' real_stuff
795 -- fully convince myself that /cygdrive/ prefixes cannot
796 -- really appear here.
797 cygdrive_prefix = "/cygdrive/"
800 | cygdrive_prefix `isPrefixOf` stuff = dropList cygdrive_prefix stuff
805 --------------------- Unix version ---------------------
808 pgmPath dir pgm = dir ++ '/' : pgm
809 dosifyPath stuff = stuff
810 --------------------------------------------------------
813 subst a b ls = map (\ x -> if x == a then b else x) ls
817 -----------------------------------------------------------------------------
818 Path name construction
821 slash :: String -> String -> String
822 absPath, relPath :: [String] -> String
825 relPath xs = foldr1 slash xs
827 absPath xs = "" `slash` relPath xs
829 slash s1 s2 = s1 ++ ('/' : s2)
833 %************************************************************************
835 \subsection{Support code}
837 %************************************************************************
840 -----------------------------------------------------------------------------
841 -- Define getExecDir :: IO (Maybe String)
843 #if defined(mingw32_TARGET_OS)
844 getExecDir :: IO (Maybe String)
845 getExecDir = do let len = (2048::Int) -- plenty, PATH_MAX is 512 under Win32.
846 buf <- mallocArray len
847 ret <- getModuleFileName nullAddr buf len
848 if ret == 0 then free buf >> return Nothing
849 else do s <- peekCString buf
851 return (Just (reverse (dropList "/bin/ghc.exe" (reverse (unDosifyPath s)))))
854 foreign import stdcall "GetModuleFileNameA" unsafe getModuleFileName :: Addr -> CString -> Int -> IO Int32
856 getExecDir :: IO (Maybe String) = do return Nothing
859 #ifdef mingw32_TARGET_OS
860 foreign import "_getpid" unsafe getProcessID :: IO Int -- relies on Int == Int32 on Windows
862 getProcessID :: IO Int
863 getProcessID = Posix.getProcessID
866 #if defined(mingw32_TARGET_OS) && (__GLASGOW_HASKELL__ <= 408)
867 rawSystem :: String -> IO ExitCode
868 rawSystem cmd = system cmd
869 -- mingw only: if you try to build a stage2 compiler with a stage1
870 -- that has been bootstrapped with 4.08 (or earlier), this will run
871 -- into problems with limits on command-line lengths with the std.
872 -- Win32 command interpreters. So don't this - use 5.00 or later
873 -- to compile up the GHC sources.