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 Exception ( catch )
63 import Exception ( catchAllIO )
64 #define catch catchAllIO
67 import Directory ( doesFileExist, removeFile )
68 import IOExts ( IORef, readIORef, writeIORef )
69 import Monad ( when, unless )
70 import System ( ExitCode(..), exitWith, getEnv, system )
75 #include "../includes/config.h"
77 #ifndef mingw32_TARGET_OS
78 import qualified Posix
80 import List ( isPrefixOf )
84 -- This is a kludge for bootstrapping with 4.08.X. Given that
85 -- all distributed compilers >= 5.0 will be compiled with themselves.
86 -- I don't think this kludge is a problem. And we have to start
87 -- building with >= 5.0 on Win32 anyway.
88 #if __GLASGOW_HASKELL__ > 408
89 -- use the line below when we can be sure of compiling with GHC >=
90 -- 5.02, and remove the implementation of rawSystem at the end of this
92 import PrelIOBase -- this can be removed when SystemExts is used
93 import CError ( throwErrnoIfMinus1 ) -- as can this
94 -- import SystemExts ( rawSystem )
96 import System ( system )
99 #include "HsVersions.h"
104 The configuration story
105 ~~~~~~~~~~~~~~~~~~~~~~~
107 GHC needs various support files (library packages, RTS etc), plus
108 various auxiliary programs (cp, gcc, etc). It finds these in one
111 * When running as an *installed program*, GHC finds most of this support
112 stuff in the installed library tree. The path to this tree is passed
113 to GHC via the -B flag, and given to initSysTools .
115 * When running *in-place* in a build tree, GHC finds most of this support
116 stuff in the build tree. The path to the build tree is, again passed
119 GHC tells which of the two is the case by seeing whether package.conf
120 is in TopDir [installed] or in TopDir/ghc/driver [inplace] (what a hack).
123 SysTools.initSysProgs figures out exactly where all the auxiliary programs
124 are, and initialises mutable variables to make it easy to call them.
125 To to this, it makes use of definitions in Config.hs, which is a Haskell
126 file containing variables whose value is figured out by the build system.
128 Config.hs contains two sorts of things
130 cGCC, The *names* of the programs
133 etc They do *not* include paths
136 cUNLIT_DIR The *path* to the directory containing unlit, split etc
137 cSPLIT_DIR *relative* to the root of the build tree,
138 for use when running *in-place* in a build tree (only)
142 ---------------------------------------------
143 NOTES for an ALTERNATIVE scheme (i.e *not* what is currently implemented):
145 Another hair-brained scheme for simplifying the current tool location
146 nightmare in GHC: Simon originally suggested using another
147 configuration file along the lines of GCC's specs file - which is fine
148 except that it means adding code to read yet another configuration
149 file. What I didn't notice is that the current package.conf is
150 general enough to do this:
153 {name = "tools", import_dirs = [], source_dirs = [],
154 library_dirs = [], hs_libraries = [], extra_libraries = [],
155 include_dirs = [], c_includes = [], package_deps = [],
156 extra_ghc_opts = ["-pgmc/usr/bin/gcc","-pgml${libdir}/bin/unlit", ... etc.],
157 extra_cc_opts = [], extra_ld_opts = []}
159 Which would have the advantage that we get to collect together in one
160 place the path-specific package stuff with the path-specific tool
163 ---------------------------------------------
166 %************************************************************************
168 \subsection{Global variables to contain system programs}
170 %************************************************************************
172 All these pathnames are maintained IN THE NATIVE FORMAT OF THE HOST MACHINE.
173 (See remarks under pathnames below)
176 GLOBAL_VAR(v_Pgm_L, error "pgm_L", String) -- unlit
177 GLOBAL_VAR(v_Pgm_P, error "pgm_P", String) -- cpp
178 GLOBAL_VAR(v_Pgm_c, error "pgm_c", String) -- gcc
179 GLOBAL_VAR(v_Pgm_m, error "pgm_m", String) -- asm code mangler
180 GLOBAL_VAR(v_Pgm_s, error "pgm_s", String) -- asm code splitter
181 GLOBAL_VAR(v_Pgm_a, error "pgm_a", String) -- as
183 GLOBAL_VAR(v_Pgm_I, error "pgm_I", String) -- ilx2il
184 GLOBAL_VAR(v_Pgm_i, error "pgm_i", String) -- ilasm
186 GLOBAL_VAR(v_Pgm_l, error "pgm_l", String) -- ld
187 GLOBAL_VAR(v_Pgm_MkDLL, error "pgm_dll", String) -- mkdll
189 GLOBAL_VAR(v_Pgm_T, error "pgm_T", String) -- touch
190 GLOBAL_VAR(v_Pgm_CP, error "pgm_CP", String) -- cp
192 GLOBAL_VAR(v_Path_package_config, error "path_package_config", String)
193 GLOBAL_VAR(v_Path_usage, error "ghc_usage.txt", String)
195 GLOBAL_VAR(v_TopDir, error "TopDir", String) -- -B<dir>
197 -- Parallel system only
198 GLOBAL_VAR(v_Pgm_sysman, error "pgm_sysman", String) -- system manager
200 -- ways to get at some of these variables from outside this module
201 getPackageConfigPath = readIORef v_Path_package_config
202 getTopDir = readIORef v_TopDir
206 %************************************************************************
208 \subsection{Initialisation}
210 %************************************************************************
213 initSysTools :: [String] -- Command-line arguments starting "-B"
215 -> IO () -- Set all the mutable variables above, holding
216 -- (a) the system programs
217 -- (b) the package-config file
218 -- (c) the GHC usage message
221 initSysTools minusB_args
222 = do { (am_installed, top_dir) <- findTopDir minusB_args
223 ; writeIORef v_TopDir top_dir
225 -- for "installed" this is the root of GHC's support files
226 -- for "in-place" it is the root of the build tree
227 -- NB: top_dir is assumed to be in standard Unix format '/' separated
229 ; let installed, installed_bin :: FilePath -> FilePath
230 installed_bin pgm = pgmPath top_dir pgm
231 installed file = pgmPath top_dir file
232 inplace dir pgm = pgmPath (top_dir `slash` dir) pgm
235 | am_installed = installed "package.conf"
236 | otherwise = inplace cGHC_DRIVER_DIR "package.conf.inplace"
239 | am_installed = installed "ghc-usage.txt"
240 | otherwise = inplace cGHC_DRIVER_DIR "ghc-usage.txt"
242 -- For all systems, unlit, split, mangle are GHC utilities
243 -- architecture-specific stuff is done when building Config.hs
245 | am_installed = installed_bin cGHC_UNLIT
246 | otherwise = inplace cGHC_UNLIT_DIR cGHC_UNLIT
248 -- split and mangle are Perl scripts
250 | am_installed = installed_bin cGHC_SPLIT
251 | otherwise = inplace cGHC_SPLIT_DIR cGHC_SPLIT
254 | am_installed = installed_bin cGHC_MANGLER
255 | otherwise = inplace cGHC_MANGLER_DIR cGHC_MANGLER
257 #ifndef mingw32_TARGET_OS
258 -- check whether TMPDIR is set in the environment
259 ; IO.try (do dir <- getEnv "TMPDIR" -- fails if not set
264 -- On Win32, consult GetTempPath() for a temp dir.
265 -- => it first tries TMP, TEMP, then finally the
266 -- Windows directory(!). The directory is in short-path
267 -- form and *does* have a trailing backslash.
269 let len = (2048::Int)
270 buf <- mallocArray len
271 ret <- getTempPath len buf
274 -- failed, consult TEMP.
275 destructArray len buf
279 destructArray len buf
282 -- strip the trailing backslash (awful, but
283 -- we only do this once).
293 -- Check that the package config exists
294 ; config_exists <- doesFileExist pkgconfig_path
295 ; when (not config_exists) $
296 throwDyn (InstallationError
297 ("Can't find package.conf as " ++ pkgconfig_path))
299 #if defined(mingw32_TARGET_OS)
300 -- WINDOWS-SPECIFIC STUFF
301 -- On Windows, gcc and friends are distributed with GHC,
302 -- so when "installed" we look in TopDir/bin
303 -- When "in-place" we look wherever the build-time configure
305 -- When "install" we tell gcc where its specs file + exes are (-B)
306 -- and also some places to pick up include files. We need
307 -- to be careful to put all necessary exes in the -B place
308 -- (as, ld, cc1, etc) since if they don't get found there, gcc
309 -- then tries to run unadorned "as", "ld", etc, and will
310 -- pick up whatever happens to be lying around in the path,
311 -- possibly including those from a cygwin install on the target,
312 -- which is exactly what we're trying to avoid.
313 ; let gcc_path | am_installed = installed_bin ("gcc -B\"" ++ installed "gcc-lib/\"")
315 -- The trailing "/" is absolutely essential; gcc seems
316 -- to construct file names simply by concatenating to this
317 -- -B path with no extra slash
318 -- We use "/" rather than "\\" because otherwise "\\\" is mangled
319 -- later on; although gcc_path is in NATIVE format, gcc can cope
320 -- (see comments with declarations of global variables)
322 -- The quotes round the -B argument are in case TopDir has spaces in it
324 perl_path | am_installed = installed_bin cGHC_PERL
325 | otherwise = cGHC_PERL
327 -- 'touch' is a GHC util for Windows, and similarly unlit, mangle
328 ; let touch_path | am_installed = installed_bin cGHC_TOUCHY
329 | otherwise = inplace cGHC_TOUCHY_DIR cGHC_TOUCHY
331 -- On Win32 we don't want to rely on #!/bin/perl, so we prepend
332 -- a call to Perl to get the invocation of split and mangle
333 ; let split_path = perl_path ++ " \"" ++ split_script ++ "\""
334 mangle_path = perl_path ++ " \"" ++ mangle_script ++ "\""
336 ; let mkdll_path = cMKDLL
338 -- UNIX-SPECIFIC STUFF
339 -- On Unix, the "standard" tools are assumed to be
340 -- in the same place whether we are running "in-place" or "installed"
341 -- That place is wherever the build-time configure script found them.
342 ; let gcc_path = cGCC
343 touch_path = cGHC_TOUCHY
344 mkdll_path = panic "Can't build DLLs on a non-Win32 system"
346 -- On Unix, scripts are invoked using the '#!' method. Binary
347 -- installations of GHC on Unix place the correct line on the front
348 -- of the script at installation time, so we don't want to wire-in
349 -- our knowledge of $(PERL) on the host system here.
350 ; let split_path = split_script
351 mangle_path = mangle_script
354 -- cpp is derived from gcc on all platforms
355 ; let cpp_path = gcc_path ++ " -E " ++ cRAWCPP_FLAGS
357 -- For all systems, copy and remove are provided by the host
358 -- system; architecture-specific stuff is done when building Config.hs
359 ; let cp_path = cGHC_CP
361 -- Other things being equal, as and ld are simply gcc
362 ; let as_path = gcc_path
366 -- ilx2il and ilasm are specified in Config.hs
367 ; let ilx2il_path = cILX2IL
371 -- Initialise the global vars
372 ; writeIORef v_Path_package_config pkgconfig_path
373 ; writeIORef v_Path_usage ghc_usage_msg_path
375 ; writeIORef v_Pgm_sysman (top_dir ++ "/ghc/rts/parallel/SysMan")
376 -- Hans: this isn't right in general, but you can
377 -- elaborate it in the same way as the others
379 ; writeIORef v_Pgm_L unlit_path
380 ; writeIORef v_Pgm_P cpp_path
381 ; writeIORef v_Pgm_c gcc_path
382 ; writeIORef v_Pgm_m mangle_path
383 ; writeIORef v_Pgm_s split_path
384 ; writeIORef v_Pgm_a as_path
386 ; writeIORef v_Pgm_I ilx2il_path
387 ; writeIORef v_Pgm_i ilasm_path
389 ; writeIORef v_Pgm_l ld_path
390 ; writeIORef v_Pgm_MkDLL mkdll_path
391 ; writeIORef v_Pgm_T touch_path
392 ; writeIORef v_Pgm_CP cp_path
397 #if defined(mingw32_TARGET_OS)
398 foreign import stdcall "GetTempPathA" getTempPath :: Int -> CString -> IO Int32
402 setPgm is called when a command-line option like
404 is used to override a particular program with a new one
407 setPgm :: String -> IO ()
408 -- The string is the flag, minus the '-pgm' prefix
409 -- So the first character says which program to override
411 setPgm ('P' : pgm) = writeIORef v_Pgm_P pgm
412 setPgm ('c' : pgm) = writeIORef v_Pgm_c pgm
413 setPgm ('m' : pgm) = writeIORef v_Pgm_m pgm
414 setPgm ('s' : pgm) = writeIORef v_Pgm_s pgm
415 setPgm ('a' : pgm) = writeIORef v_Pgm_a pgm
416 setPgm ('l' : pgm) = writeIORef v_Pgm_l pgm
418 setPgm ('I' : pgm) = writeIORef v_Pgm_I pgm
419 setPgm ('i' : pgm) = writeIORef v_Pgm_i pgm
421 setPgm pgm = unknownFlagErr ("-pgm" ++ pgm)
427 -- for "installed" this is the root of GHC's support files
428 -- for "in-place" it is the root of the build tree
431 -- 1. Set proto_top_dir
432 -- a) look for (the last) -B flag, and use it
433 -- b) if there are no -B flags, get the directory
434 -- where GHC is running (only on Windows)
436 -- 2. If package.conf exists in proto_top_dir, we are running
437 -- installed; and TopDir = proto_top_dir
439 -- 3. Otherwise we are running in-place, so
440 -- proto_top_dir will be /...stuff.../ghc/compiler
441 -- Set TopDir to /...stuff..., which is the root of the build tree
443 -- This is very gruesome indeed
445 findTopDir :: [String]
446 -> IO (Bool, -- True <=> am installed, False <=> in-place
447 String) -- TopDir (in Unix format '/' separated)
450 = do { top_dir <- get_proto
451 -- Discover whether we're running in a build tree or in an installation,
452 -- by looking for the package configuration file.
453 ; am_installed <- doesFileExist (top_dir `slash` "package.conf")
455 ; return (am_installed, top_dir)
458 -- get_proto returns a Unix-format path (relying on getExecDir to do so too)
459 get_proto | not (null minusbs)
460 = return (unDosifyPath (drop 2 (last minusbs))) -- 2 for "-B"
462 = do { maybe_exec_dir <- getExecDir -- Get directory of executable
463 ; case maybe_exec_dir of -- (only works on Windows;
464 -- returns Nothing on Unix)
465 Nothing -> throwDyn (InstallationError "missing -B<dir> option")
466 Just dir -> return dir
471 %************************************************************************
473 \subsection{Command-line options}
475 %************************************************************************
477 When invoking external tools as part of the compilation pipeline, we
478 pass these a sequence of options on the command-line. Rather than
479 just using a list of Strings, we use a type that allows us to distinguish
480 between filepaths and 'other stuff'. [The reason being, of course, that
481 this type gives us a handle on transforming filenames, and filenames only,
482 to whatever format they're expected to be on a particular platform.]
486 = FileOption -- an entry that _contains_ filename(s) / filepaths.
487 String -- a non-filepath prefix that shouldn't be transformed (e.g., "/out="
488 String -- the filepath/filename portion
491 showOptions :: [Option] -> String
492 showOptions ls = unwords (map (quote.showOpt) ls)
494 showOpt (FileOption pre f) = pre ++ dosifyPath f
495 showOpt (Option s) = s
497 #if defined(mingw32_TARGET_OS)
499 quote s = "\"" ++ s ++ "\""
507 %************************************************************************
509 \subsection{Running an external program}
511 %************************************************************************
515 runUnlit :: [Option] -> IO ()
516 runUnlit args = do p <- readIORef v_Pgm_L
517 runSomething "Literate pre-processor" p args
519 runCpp :: [Option] -> IO ()
520 runCpp args = do p <- readIORef v_Pgm_P
521 runSomething "C pre-processor" p args
523 runCc :: [Option] -> IO ()
524 runCc args = do p <- readIORef v_Pgm_c
525 runSomething "C Compiler" p args
527 runMangle :: [Option] -> IO ()
528 runMangle args = do p <- readIORef v_Pgm_m
529 runSomething "Mangler" p args
531 runSplit :: [Option] -> IO ()
532 runSplit args = do p <- readIORef v_Pgm_s
533 runSomething "Splitter" p args
535 runAs :: [Option] -> IO ()
536 runAs args = do p <- readIORef v_Pgm_a
537 runSomething "Assembler" p args
539 runLink :: [Option] -> IO ()
540 runLink args = do p <- readIORef v_Pgm_l
541 runSomething "Linker" p args
544 runIlx2il :: [Option] -> IO ()
545 runIlx2il args = do p <- readIORef v_Pgm_I
546 runSomething "Ilx2Il" p args
548 runIlasm :: [Option] -> IO ()
549 runIlasm args = do p <- readIORef v_Pgm_i
550 runSomething "Ilasm" p args
553 runMkDLL :: [Option] -> IO ()
554 runMkDLL args = do p <- readIORef v_Pgm_MkDLL
555 runSomething "Make DLL" p args
557 touch :: String -> String -> IO ()
558 touch purpose arg = do p <- readIORef v_Pgm_T
559 runSomething purpose p [FileOption "" arg]
561 copy :: String -> String -> String -> IO ()
562 copy purpose from to = do
563 verb <- dynFlag verbosity
564 when (verb >= 2) $ hPutStrLn stderr ("*** " ++ purpose)
566 h <- openFile to WriteMode
567 ls <- readFile from -- inefficient, but it'll do for now.
568 -- ToDo: speed up via slurping.
574 getSysMan :: IO String -- How to invoke the system manager
575 -- (parallel system only)
576 getSysMan = readIORef v_Pgm_sysman
579 %************************************************************************
581 \subsection{GHC Usage message}
583 %************************************************************************
585 Show the usage message and exit
588 showGhcUsage = do { usage_path <- readIORef v_Path_usage
589 ; usage <- readFile usage_path
591 ; exitWith ExitSuccess }
594 dump ('$':'$':s) = hPutStr stderr progName >> dump s
595 dump (c:s) = hPutChar stderr c >> dump s
599 %************************************************************************
601 \subsection{Managing temporary files
603 %************************************************************************
606 GLOBAL_VAR(v_FilesToClean, [], [String] )
607 GLOBAL_VAR(v_TmpDir, cDEFAULT_TMPDIR, String )
608 -- v_TmpDir has no closing '/'
612 setTmpDir dir = writeIORef v_TmpDir dir
614 cleanTempFiles :: Int -> IO ()
615 cleanTempFiles verb = do fs <- readIORef v_FilesToClean
616 removeTmpFiles verb fs
618 cleanTempFilesExcept :: Int -> [FilePath] -> IO ()
619 cleanTempFilesExcept verb dont_delete
620 = do fs <- readIORef v_FilesToClean
621 let leftovers = filter (`notElem` dont_delete) fs
622 removeTmpFiles verb leftovers
623 writeIORef v_FilesToClean dont_delete
626 -- find a temporary name that doesn't already exist.
627 newTempName :: Suffix -> IO FilePath
629 = do x <- getProcessID
630 tmp_dir <- readIORef v_TmpDir
631 findTempName tmp_dir x
633 findTempName tmp_dir x
634 = do let filename = tmp_dir ++ "/ghc" ++ show x ++ '.':extn
635 b <- doesFileExist filename
636 if b then findTempName tmp_dir (x+1)
637 else do add v_FilesToClean filename -- clean it up later
640 addFilesToClean :: [FilePath] -> IO ()
641 -- May include wildcards [used by DriverPipeline.run_phase SplitMangle]
642 addFilesToClean files = mapM_ (add v_FilesToClean) files
644 removeTmpFiles :: Int -> [FilePath] -> IO ()
645 removeTmpFiles verb fs
646 = traceCmd "Deleting temp files"
647 ("Deleting: " ++ unwords fs)
650 rm f = removeFile f `catch`
653 hPutStrLn stderr ("Warning: deleting non-existent " ++ f)
659 %************************************************************************
661 \subsection{Running a program}
663 %************************************************************************
666 GLOBAL_VAR(v_Dry_run, False, Bool)
669 setDryRun = writeIORef v_Dry_run True
671 -----------------------------------------------------------------------------
672 -- Running an external program
674 runSomething :: String -- For -v message
675 -> String -- Command name (possibly a full path)
676 -- assumed already dos-ified
677 -> [Option] -- Arguments
678 -- runSomething will dos-ify them
681 runSomething phase_name pgm args
682 = traceCmd phase_name cmd_line $
684 #ifndef mingw32_TARGET_OS
685 exit_code <- system cmd_line
687 exit_code <- rawSystem cmd_line
689 ; if exit_code /= ExitSuccess
690 then throwDyn (PhaseFailed phase_name exit_code)
694 cmd_line = pgm ++ ' ':showOptions args -- unwords (pgm : dosifyPaths (map quote args))
695 -- The pgm is already in native format (appropriate dir separators)
696 #if defined(mingw32_TARGET_OS)
698 quote s = "\"" ++ s ++ "\""
703 traceCmd :: String -> String -> IO () -> IO ()
704 -- a) trace the command (at two levels of verbosity)
705 -- b) don't do it at all if dry-run is set
706 traceCmd phase_name cmd_line action
707 = do { verb <- dynFlag verbosity
708 ; when (verb >= 2) $ hPutStrLn stderr ("*** " ++ phase_name)
709 ; when (verb >= 3) $ hPutStrLn stderr cmd_line
713 ; n <- readIORef v_Dry_run
717 ; action `catch` handle_exn verb
720 handle_exn verb exn = do { when (verb >= 2) (hPutStr stderr "\n")
721 ; when (verb >= 3) (hPutStrLn stderr ("Failed: " ++ cmd_line))
722 ; throwDyn (PhaseFailed phase_name (ExitFailure 1)) }
726 %************************************************************************
728 \subsection{Path names}
730 %************************************************************************
732 We maintain path names in Unix form ('/'-separated) right until
733 the last moment. On Windows we dos-ify them just before passing them
734 to the Windows command.
736 The alternative, of using '/' consistently on Unix and '\' on Windows,
737 proved quite awkward. There were a lot more calls to dosifyPath,
738 and even on Windows we might invoke a unix-like utility (eg 'sh'), which
739 interpreted a command line 'foo\baz' as 'foobaz'.
742 -----------------------------------------------------------------------------
743 -- Convert filepath into MSDOS form.
745 dosifyPaths :: [String] -> [String]
746 -- dosifyPaths does two things
747 -- a) change '/' to '\'
748 -- b) remove initial '/cygdrive/'
750 unDosifyPath :: String -> String
751 -- Just change '\' to '/'
753 pgmPath :: String -- Directory string in Unix format
754 -> String -- Program name with no directory separators
756 -> String -- Program invocation string in native format
760 #if defined(mingw32_TARGET_OS)
762 --------------------- Windows version ------------------
763 dosifyPaths xs = map dosifyPath xs
765 unDosifyPath xs = subst '\\' '/' xs
767 pgmPath dir pgm = dosifyPath dir ++ '\\' : pgm
770 = subst '/' '\\' real_stuff
772 -- fully convince myself that /cygdrive/ prefixes cannot
773 -- really appear here.
774 cygdrive_prefix = "/cygdrive/"
777 | cygdrive_prefix `isPrefixOf` stuff = drop (length cygdrive_prefix) stuff
782 --------------------- Unix version ---------------------
785 pgmPath dir pgm = dir ++ '/' : pgm
786 dosifyPath stuff = stuff
787 --------------------------------------------------------
790 subst a b ls = map (\ x -> if x == a then b else x) ls
794 -----------------------------------------------------------------------------
795 Path name construction
798 slash :: String -> String -> String
799 absPath, relPath :: [String] -> String
802 relPath xs = foldr1 slash xs
804 absPath xs = "" `slash` relPath xs
806 slash s1 s2 = s1 ++ ('/' : s2)
810 %************************************************************************
812 \subsection{Support code}
814 %************************************************************************
817 -----------------------------------------------------------------------------
818 -- Define getExecDir :: IO (Maybe String)
820 #if defined(mingw32_TARGET_OS)
821 getExecDir :: IO (Maybe String)
822 getExecDir = do let len = (2048::Int) -- plenty, PATH_MAX is 512 under Win32.
823 buf <- mallocArray len
824 ret <- getModuleFileName nullAddr buf len
825 if ret == 0 then destructArray len buf >> return Nothing
826 else do s <- peekCString buf
827 destructArray len buf
828 return (Just (reverse (drop (length "/bin/ghc.exe") (reverse (unDosifyPath s)))))
831 foreign import stdcall "GetModuleFileNameA" getModuleFileName :: Addr -> CString -> Int -> IO Int32
833 getExecDir :: IO (Maybe String) = do return Nothing
836 #ifdef mingw32_TARGET_OS
837 foreign import "_getpid" getProcessID :: IO Int -- relies on Int == Int32 on Windows
839 getProcessID :: IO Int
840 getProcessID = Posix.getProcessID
843 rawSystem :: String -> IO ExitCode
844 #if __GLASGOW_HASKELL__ > 408
845 rawSystem "" = ioException (IOError Nothing InvalidArgument "rawSystem" "null command" Nothing)
847 withCString cmd $ \s -> do
848 status <- throwErrnoIfMinus1 "rawSystem" (primRawSystem s)
850 0 -> return ExitSuccess
851 n -> return (ExitFailure n)
853 foreign import ccall "rawSystemCmd" unsafe primRawSystem :: CString -> IO Int
855 rawSystem = System.system