{- ----------------------------------------------------------------------------- -- -- (c) The University of Glasgow 2001-2003 -- -- Access to system tools: gcc, cp, rm etc -- ----------------------------------------------------------------------------- -} {-# LANGUAGE CPP, MultiWayIf, ScopedTypeVariables #-} module SysTools ( -- Initialisation initSysTools, initLlvmTargets, -- Interface to system tools runUnlit, runCpp, runCc, -- [Option] -> IO () runPp, -- [Option] -> IO () runSplit, -- [Option] -> IO () runAs, runLink, runLibtool, -- [Option] -> IO () runAr, askAr, runRanlib, runMkDLL, runWindres, runLlvmOpt, runLlvmLlc, runClang, figureLlvmVersion, getLinkerInfo, getCompilerInfo, linkDynLib, askLd, touch, -- String -> String -> IO () copy, copyWithHeader, Option(..), -- platform-specifics libmLinkOpts, -- frameworks getPkgFrameworkOpts, getFrameworkOpts ) where #include "HsVersions.h" import Module import Packages import Config import Outputable import ErrUtils import Panic import Platform import Util import DynFlags import Exception import FileCleanup import LlvmCodeGen.Base (llvmVersionStr, supportedLlvmVersion) import Data.IORef import System.Exit import System.Environment import System.FilePath import System.IO import System.IO.Error as IO import System.Directory import Data.Char import Data.List #if defined(mingw32_HOST_OS) #if MIN_VERSION_Win32(2,5,0) import qualified System.Win32.Types as Win32 #else import qualified System.Win32.Info as Win32 #endif import Foreign import Foreign.C.String import System.Win32.Types (DWORD, LPTSTR, HANDLE) import System.Win32.Types (failIfNull, failIf, iNVALID_HANDLE_VALUE) import System.Win32.File (createFile,closeHandle, gENERIC_READ, fILE_SHARE_READ, oPEN_EXISTING, fILE_ATTRIBUTE_NORMAL, fILE_FLAG_BACKUP_SEMANTICS ) import System.Win32.DLL (loadLibrary, getProcAddress) #endif import System.Process import Control.Concurrent import FastString import SrcLoc ( SrcLoc, mkSrcLoc, noSrcSpan, mkSrcSpan ) #if defined(mingw32_HOST_OS) # if defined(i386_HOST_ARCH) # define WINDOWS_CCONV stdcall # elif defined(x86_64_HOST_ARCH) # define WINDOWS_CCONV ccall # else # error Unknown mingw32 arch # endif #endif {- How GHC finds its files ~~~~~~~~~~~~~~~~~~~~~~~ [Note topdir] GHC needs various support files (library packages, RTS etc), plus various auxiliary programs (cp, gcc, etc). It starts by finding topdir, the root of GHC's support files On Unix: - ghc always has a shell wrapper that passes a -B option On Windows: - ghc never has a shell wrapper. - we can find the location of the ghc binary, which is $topdir//.exe where may be "ghc", "ghc-stage2", or similar - we strip off the "/.exe" to leave $topdir. from topdir we can find package.conf, ghc-asm, etc. SysTools.initSysProgs figures out exactly where all the auxiliary programs are, and initialises mutable variables to make it easy to call them. To to this, it makes use of definitions in Config.hs, which is a Haskell file containing variables whose value is figured out by the build system. Config.hs contains two sorts of things cGCC, The *names* of the programs cCPP e.g. cGCC = gcc cUNLIT cCPP = gcc -E etc They do *not* include paths cUNLIT_DIR The *path* to the directory containing unlit, split etc cSPLIT_DIR *relative* to the root of the build tree, for use when running *in-place* in a build tree (only) --------------------------------------------- NOTES for an ALTERNATIVE scheme (i.e *not* what is currently implemented): Another hair-brained scheme for simplifying the current tool location nightmare in GHC: Simon originally suggested using another configuration file along the lines of GCC's specs file - which is fine except that it means adding code to read yet another configuration file. What I didn't notice is that the current package.conf is general enough to do this: Package {name = "tools", import_dirs = [], source_dirs = [], library_dirs = [], hs_libraries = [], extra_libraries = [], include_dirs = [], c_includes = [], package_deps = [], extra_ghc_opts = ["-pgmc/usr/bin/gcc","-pgml${topdir}/bin/unlit", ... etc.], extra_cc_opts = [], extra_ld_opts = []} Which would have the advantage that we get to collect together in one place the path-specific package stuff with the path-specific tool stuff. End of NOTES --------------------------------------------- ************************************************************************ * * \subsection{Initialisation} * * ************************************************************************ -} initLlvmTargets :: Maybe String -> IO LlvmTargets initLlvmTargets mbMinusB = do top_dir <- findTopDir mbMinusB let llvmTargetsFile = top_dir "llvm-targets" llvmTargetsStr <- readFile llvmTargetsFile case maybeReadFuzzy llvmTargetsStr of Just s -> return (fmap mkLlvmTarget <$> s) Nothing -> pgmError ("Can't parse " ++ show llvmTargetsFile) where mkLlvmTarget :: (String, String, String) -> LlvmTarget mkLlvmTarget (dl, cpu, attrs) = LlvmTarget dl cpu (words attrs) initSysTools :: Maybe String -- Maybe TopDir path (without the '-B' prefix) -> IO Settings -- Set all the mutable variables above, holding -- (a) the system programs -- (b) the package-config file -- (c) the GHC usage message initSysTools mbMinusB = do top_dir <- findTopDir mbMinusB -- see [Note topdir] -- NB: top_dir is assumed to be in standard Unix -- format, '/' separated let settingsFile = top_dir "settings" platformConstantsFile = top_dir "platformConstants" installed :: FilePath -> FilePath installed file = top_dir file libexec :: FilePath -> FilePath libexec file = top_dir "bin" file settingsStr <- readFile settingsFile platformConstantsStr <- readFile platformConstantsFile mySettings <- case maybeReadFuzzy settingsStr of Just s -> return s Nothing -> pgmError ("Can't parse " ++ show settingsFile) platformConstants <- case maybeReadFuzzy platformConstantsStr of Just s -> return s Nothing -> pgmError ("Can't parse " ++ show platformConstantsFile) let getSetting key = case lookup key mySettings of Just xs -> return $ case stripPrefix "$topdir" xs of Just [] -> top_dir Just xs'@(c:_) | isPathSeparator c -> top_dir ++ xs' _ -> xs Nothing -> pgmError ("No entry for " ++ show key ++ " in " ++ show settingsFile) getBooleanSetting key = case lookup key mySettings of Just "YES" -> return True Just "NO" -> return False Just xs -> pgmError ("Bad value for " ++ show key ++ ": " ++ show xs) Nothing -> pgmError ("No entry for " ++ show key ++ " in " ++ show settingsFile) readSetting key = case lookup key mySettings of Just xs -> case maybeRead xs of Just v -> return v Nothing -> pgmError ("Failed to read " ++ show key ++ " value " ++ show xs) Nothing -> pgmError ("No entry for " ++ show key ++ " in " ++ show settingsFile) crossCompiling <- getBooleanSetting "cross compiling" targetArch <- readSetting "target arch" targetOS <- readSetting "target os" targetWordSize <- readSetting "target word size" targetUnregisterised <- getBooleanSetting "Unregisterised" targetHasGnuNonexecStack <- readSetting "target has GNU nonexec stack" targetHasIdentDirective <- readSetting "target has .ident directive" targetHasSubsectionsViaSymbols <- readSetting "target has subsections via symbols" myExtraGccViaCFlags <- getSetting "GCC extra via C opts" -- On Windows, mingw is distributed with GHC, -- so we look in TopDir/../mingw/bin -- It would perhaps be nice to be able to override this -- with the settings file, but it would be a little fiddly -- to make that possible, so for now you can't. gcc_prog <- getSetting "C compiler command" gcc_args_str <- getSetting "C compiler flags" gccSupportsNoPie <- getBooleanSetting "C compiler supports -no-pie" cpp_prog <- getSetting "Haskell CPP command" cpp_args_str <- getSetting "Haskell CPP flags" let unreg_gcc_args = if targetUnregisterised then ["-DNO_REGS", "-DUSE_MINIINTERPRETER"] else [] -- TABLES_NEXT_TO_CODE affects the info table layout. tntc_gcc_args | mkTablesNextToCode targetUnregisterised = ["-DTABLES_NEXT_TO_CODE"] | otherwise = [] cpp_args= map Option (words cpp_args_str) gcc_args = map Option (words gcc_args_str ++ unreg_gcc_args ++ tntc_gcc_args) ldSupportsCompactUnwind <- getBooleanSetting "ld supports compact unwind" ldSupportsBuildId <- getBooleanSetting "ld supports build-id" ldSupportsFilelist <- getBooleanSetting "ld supports filelist" ldIsGnuLd <- getBooleanSetting "ld is GNU ld" perl_path <- getSetting "perl command" let pkgconfig_path = installed "package.conf.d" ghc_usage_msg_path = installed "ghc-usage.txt" ghci_usage_msg_path = installed "ghci-usage.txt" -- For all systems, unlit, split, mangle are GHC utilities -- architecture-specific stuff is done when building Config.hs unlit_path = libexec cGHC_UNLIT_PGM -- split is a Perl script split_script = libexec cGHC_SPLIT_PGM windres_path <- getSetting "windres command" libtool_path <- getSetting "libtool command" ar_path <- getSetting "ar command" ranlib_path <- getSetting "ranlib command" tmpdir <- getTemporaryDirectory touch_path <- getSetting "touch command" let -- On Win32 we don't want to rely on #!/bin/perl, so we prepend -- a call to Perl to get the invocation of split. -- On Unix, scripts are invoked using the '#!' method. Binary -- installations of GHC on Unix place the correct line on the -- front of the script at installation time, so we don't want -- to wire-in our knowledge of $(PERL) on the host system here. (split_prog, split_args) | isWindowsHost = (perl_path, [Option split_script]) | otherwise = (split_script, []) mkdll_prog <- getSetting "dllwrap command" let mkdll_args = [] -- cpp is derived from gcc on all platforms -- HACK, see setPgmP below. We keep 'words' here to remember to fix -- Config.hs one day. -- Other things being equal, as and ld are simply gcc gcc_link_args_str <- getSetting "C compiler link flags" let as_prog = gcc_prog as_args = gcc_args ld_prog = gcc_prog ld_args = gcc_args ++ map Option (words gcc_link_args_str) -- We just assume on command line lc_prog <- getSetting "LLVM llc command" lo_prog <- getSetting "LLVM opt command" lcc_prog <- getSetting "LLVM clang command" let iserv_prog = libexec "ghc-iserv" let platform = Platform { platformArch = targetArch, platformOS = targetOS, platformWordSize = targetWordSize, platformUnregisterised = targetUnregisterised, platformHasGnuNonexecStack = targetHasGnuNonexecStack, platformHasIdentDirective = targetHasIdentDirective, platformHasSubsectionsViaSymbols = targetHasSubsectionsViaSymbols, platformIsCrossCompiling = crossCompiling } return $ Settings { sTargetPlatform = platform, sTmpDir = normalise tmpdir, sGhcUsagePath = ghc_usage_msg_path, sGhciUsagePath = ghci_usage_msg_path, sTopDir = top_dir, sRawSettings = mySettings, sExtraGccViaCFlags = words myExtraGccViaCFlags, sSystemPackageConfig = pkgconfig_path, sLdSupportsCompactUnwind = ldSupportsCompactUnwind, sLdSupportsBuildId = ldSupportsBuildId, sLdSupportsFilelist = ldSupportsFilelist, sLdIsGnuLd = ldIsGnuLd, sGccSupportsNoPie = gccSupportsNoPie, sProgramName = "ghc", sProjectVersion = cProjectVersion, sPgm_L = unlit_path, sPgm_P = (cpp_prog, cpp_args), sPgm_F = "", sPgm_c = (gcc_prog, gcc_args), sPgm_s = (split_prog,split_args), sPgm_a = (as_prog, as_args), sPgm_l = (ld_prog, ld_args), sPgm_dll = (mkdll_prog,mkdll_args), sPgm_T = touch_path, sPgm_windres = windres_path, sPgm_libtool = libtool_path, sPgm_ar = ar_path, sPgm_ranlib = ranlib_path, sPgm_lo = (lo_prog,[]), sPgm_lc = (lc_prog,[]), sPgm_lcc = (lcc_prog,[]), sPgm_i = iserv_prog, sOpt_L = [], sOpt_P = [], sOpt_F = [], sOpt_c = [], sOpt_a = [], sOpt_l = [], sOpt_windres = [], sOpt_lcc = [], sOpt_lo = [], sOpt_lc = [], sOpt_i = [], sPlatformConstants = platformConstants } -- returns a Unix-format path (relying on getBaseDir to do so too) findTopDir :: Maybe String -- Maybe TopDir path (without the '-B' prefix). -> IO String -- TopDir (in Unix format '/' separated) findTopDir (Just minusb) = return (normalise minusb) findTopDir Nothing = do -- Get directory of executable maybe_exec_dir <- getBaseDir case maybe_exec_dir of -- "Just" on Windows, "Nothing" on unix Nothing -> throwGhcExceptionIO (InstallationError "missing -B option") Just dir -> return dir {- ************************************************************************ * * \subsection{Running an external program} * * ************************************************************************ -} runUnlit :: DynFlags -> [Option] -> IO () runUnlit dflags args = do let prog = pgm_L dflags opts = getOpts dflags opt_L runSomething dflags "Literate pre-processor" prog (map Option opts ++ args) runCpp :: DynFlags -> [Option] -> IO () runCpp dflags args = do let (p,args0) = pgm_P dflags args1 = map Option (getOpts dflags opt_P) args2 = [Option "-Werror" | gopt Opt_WarnIsError dflags] ++ [Option "-Wundef" | wopt Opt_WarnCPPUndef dflags] mb_env <- getGccEnv args2 runSomethingFiltered dflags id "C pre-processor" p (args0 ++ args1 ++ args2 ++ args) Nothing mb_env runPp :: DynFlags -> [Option] -> IO () runPp dflags args = do let prog = pgm_F dflags opts = map Option (getOpts dflags opt_F) runSomething dflags "Haskell pre-processor" prog (args ++ opts) runCc :: DynFlags -> [Option] -> IO () runCc dflags args = do let (p,args0) = pgm_c dflags args1 = map Option (getOpts dflags opt_c) args2 = args0 ++ args1 ++ args mb_env <- getGccEnv args2 runSomethingResponseFile dflags cc_filter "C Compiler" p args2 mb_env where -- discard some harmless warnings from gcc that we can't turn off cc_filter = unlines . doFilter . lines {- gcc gives warnings in chunks like so: In file included from /foo/bar/baz.h:11, from /foo/bar/baz2.h:22, from wibble.c:33: /foo/flibble:14: global register variable ... /foo/flibble:15: warning: call-clobbered r... We break it up into its chunks, remove any call-clobbered register warnings from each chunk, and then delete any chunks that we have emptied of warnings. -} doFilter = unChunkWarnings . filterWarnings . chunkWarnings [] -- We can't assume that the output will start with an "In file inc..." -- line, so we start off expecting a list of warnings rather than a -- location stack. chunkWarnings :: [String] -- The location stack to use for the next -- list of warnings -> [String] -- The remaining lines to look at -> [([String], [String])] chunkWarnings loc_stack [] = [(loc_stack, [])] chunkWarnings loc_stack xs = case break loc_stack_start xs of (warnings, lss:xs') -> case span loc_start_continuation xs' of (lsc, xs'') -> (loc_stack, warnings) : chunkWarnings (lss : lsc) xs'' _ -> [(loc_stack, xs)] filterWarnings :: [([String], [String])] -> [([String], [String])] filterWarnings [] = [] -- If the warnings are already empty then we are probably doing -- something wrong, so don't delete anything filterWarnings ((xs, []) : zs) = (xs, []) : filterWarnings zs filterWarnings ((xs, ys) : zs) = case filter wantedWarning ys of [] -> filterWarnings zs ys' -> (xs, ys') : filterWarnings zs unChunkWarnings :: [([String], [String])] -> [String] unChunkWarnings [] = [] unChunkWarnings ((xs, ys) : zs) = xs ++ ys ++ unChunkWarnings zs loc_stack_start s = "In file included from " `isPrefixOf` s loc_start_continuation s = " from " `isPrefixOf` s wantedWarning w | "warning: call-clobbered register used" `isContainedIn` w = False | otherwise = True isContainedIn :: String -> String -> Bool xs `isContainedIn` ys = any (xs `isPrefixOf`) (tails ys) -- | Run the linker with some arguments and return the output askLd :: DynFlags -> [Option] -> IO String askLd dflags args = do let (p,args0) = pgm_l dflags args1 = map Option (getOpts dflags opt_l) args2 = args0 ++ args1 ++ args mb_env <- getGccEnv args2 runSomethingWith dflags "gcc" p args2 $ \real_args -> readCreateProcessWithExitCode' (proc p real_args){ env = mb_env } -- Similar to System.Process.readCreateProcessWithExitCode, but stderr is -- inherited from the parent process, and output to stderr is not captured. readCreateProcessWithExitCode' :: CreateProcess -> IO (ExitCode, String) -- ^ stdout readCreateProcessWithExitCode' proc = do (_, Just outh, _, pid) <- createProcess proc{ std_out = CreatePipe } -- fork off a thread to start consuming the output output <- hGetContents outh outMVar <- newEmptyMVar _ <- forkIO $ evaluate (length output) >> putMVar outMVar () -- wait on the output takeMVar outMVar hClose outh -- wait on the process ex <- waitForProcess pid return (ex, output) replaceVar :: (String, String) -> [(String, String)] -> [(String, String)] replaceVar (var, value) env = (var, value) : filter (\(var',_) -> var /= var') env -- | Version of @System.Process.readProcessWithExitCode@ that takes a -- key-value tuple to insert into the environment. readProcessEnvWithExitCode :: String -- ^ program path -> [String] -- ^ program args -> (String, String) -- ^ addition to the environment -> IO (ExitCode, String, String) -- ^ (exit_code, stdout, stderr) readProcessEnvWithExitCode prog args env_update = do current_env <- getEnvironment readCreateProcessWithExitCode (proc prog args) { env = Just (replaceVar env_update current_env) } "" -- Don't let gcc localize version info string, #8825 c_locale_env :: (String, String) c_locale_env = ("LANGUAGE", "C") -- If the -B option is set, add to PATH. This works around -- a bug in gcc on Windows Vista where it can't find its auxiliary -- binaries (see bug #1110). getGccEnv :: [Option] -> IO (Maybe [(String,String)]) getGccEnv opts = if null b_dirs then return Nothing else do env <- getEnvironment return (Just (map mangle_path env)) where (b_dirs, _) = partitionWith get_b_opt opts get_b_opt (Option ('-':'B':dir)) = Left dir get_b_opt other = Right other mangle_path (path,paths) | map toUpper path == "PATH" = (path, '\"' : head b_dirs ++ "\";" ++ paths) mangle_path other = other runSplit :: DynFlags -> [Option] -> IO () runSplit dflags args = do let (p,args0) = pgm_s dflags runSomething dflags "Splitter" p (args0++args) runAs :: DynFlags -> [Option] -> IO () runAs dflags args = do let (p,args0) = pgm_a dflags args1 = map Option (getOpts dflags opt_a) args2 = args0 ++ args1 ++ args mb_env <- getGccEnv args2 runSomethingFiltered dflags id "Assembler" p args2 Nothing mb_env -- | Run the LLVM Optimiser runLlvmOpt :: DynFlags -> [Option] -> IO () runLlvmOpt dflags args = do let (p,args0) = pgm_lo dflags args1 = map Option (getOpts dflags opt_lo) runSomething dflags "LLVM Optimiser" p (args0 ++ args1 ++ args) -- | Run the LLVM Compiler runLlvmLlc :: DynFlags -> [Option] -> IO () runLlvmLlc dflags args = do let (p,args0) = pgm_lc dflags args1 = map Option (getOpts dflags opt_lc) runSomething dflags "LLVM Compiler" p (args0 ++ args1 ++ args) -- | Run the clang compiler (used as an assembler for the LLVM -- backend on OS X as LLVM doesn't support the OS X system -- assembler) runClang :: DynFlags -> [Option] -> IO () runClang dflags args = do let (clang,_) = pgm_lcc dflags -- be careful what options we call clang with -- see #5903 and #7617 for bugs caused by this. (_,args0) = pgm_a dflags args1 = map Option (getOpts dflags opt_a) args2 = args0 ++ args1 ++ args mb_env <- getGccEnv args2 Exception.catch (do runSomethingFiltered dflags id "Clang (Assembler)" clang args2 Nothing mb_env ) (\(err :: SomeException) -> do errorMsg dflags $ text ("Error running clang! you need clang installed to use the" ++ " LLVM backend") $+$ text "(or GHC tried to execute clang incorrectly)" throwIO err ) -- | Figure out which version of LLVM we are running this session figureLlvmVersion :: DynFlags -> IO (Maybe (Int, Int)) figureLlvmVersion dflags = do let (pgm,opts) = pgm_lc dflags args = filter notNull (map showOpt opts) -- we grab the args even though they should be useless just in -- case the user is using a customised 'llc' that requires some -- of the options they've specified. llc doesn't care what other -- options are specified when '-version' is used. args' = args ++ ["-version"] ver <- catchIO (do (pin, pout, perr, _) <- runInteractiveProcess pgm args' Nothing Nothing {- > llc -version LLVM (http://llvm.org/): LLVM version 3.5.2 ... -} hSetBinaryMode pout False _ <- hGetLine pout vline <- dropWhile (not . isDigit) `fmap` hGetLine pout v <- case span (/= '.') vline of ("",_) -> fail "no digits!" (x,y) -> return (read x , read $ takeWhile isDigit $ drop 1 y) hClose pin hClose pout hClose perr return $ Just v ) (\err -> do debugTraceMsg dflags 2 (text "Error (figuring out LLVM version):" <+> text (show err)) errorMsg dflags $ vcat [ text "Warning:", nest 9 $ text "Couldn't figure out LLVM version!" $$ text ("Make sure you have installed LLVM " ++ llvmVersionStr supportedLlvmVersion) ] return Nothing) return ver {- Note [Windows stack usage] See: Trac #8870 (and #8834 for related info) and #12186 On Windows, occasionally we need to grow the stack. In order to do this, we would normally just bump the stack pointer - but there's a catch on Windows. If the stack pointer is bumped by more than a single page, then the pages between the initial pointer and the resulting location must be properly committed by the Windows virtual memory subsystem. This is only needed in the event we bump by more than one page (i.e 4097 bytes or more). Windows compilers solve this by emitting a call to a special function called _chkstk, which does this committing of the pages for you. The reason this was causing a segfault was because due to the fact the new code generator tends to generate larger functions, we needed more stack space in GHC itself. In the x86 codegen, we needed approximately ~12kb of stack space in one go, which caused the process to segfault, as the intervening pages were not committed. GCC can emit such a check for us automatically but only when the flag -fstack-check is used. See https://gcc.gnu.org/onlinedocs/gnat_ugn/Stack-Overflow-Checking.html for more information. -} {- Note [Run-time linker info] See also: Trac #5240, Trac #6063, Trac #10110 Before 'runLink', we need to be sure to get the relevant information about the linker we're using at runtime to see if we need any extra options. For example, GNU ld requires '--reduce-memory-overheads' and '--hash-size=31' in order to use reasonable amounts of memory (see trac #5240.) But this isn't supported in GNU gold. Generally, the linker changing from what was detected at ./configure time has always been possible using -pgml, but on Linux it can happen 'transparently' by installing packages like binutils-gold, which change what /usr/bin/ld actually points to. Clang vs GCC notes: For gcc, 'gcc -Wl,--version' gives a bunch of output about how to invoke the linker before the version information string. For 'clang', the version information for 'ld' is all that's output. For this reason, we typically need to slurp up all of the standard error output and look through it. Other notes: We cache the LinkerInfo inside DynFlags, since clients may link multiple times. The definition of LinkerInfo is there to avoid a circular dependency. -} {- Note [ELF needed shared libs] Some distributions change the link editor's default handling of ELF DT_NEEDED tags to include only those shared objects that are needed to resolve undefined symbols. For Template Haskell we need the last temporary shared library also if it is not needed for the currently linked temporary shared library. We specify --no-as-needed to override the default. This flag exists in GNU ld and GNU gold. The flag is only needed on ELF systems. On Windows (PE) and Mac OS X (Mach-O) the flag is not needed. -} {- Note [Windows static libGCC] The GCC versions being upgraded to in #10726 are configured with dynamic linking of libgcc supported. This results in libgcc being linked dynamically when a shared library is created. This introduces thus an extra dependency on GCC dll that was not needed before by shared libraries created with GHC. This is a particular issue on Windows because you get a non-obvious error due to this missing dependency. This dependent dll is also not commonly on your path. For this reason using the static libgcc is preferred as it preserves the same behaviour that existed before. There are however some very good reasons to have the shared version as well as described on page 181 of https://gcc.gnu.org/onlinedocs/gcc-5.2.0/gcc.pdf : "There are several situations in which an application should use the shared ‘libgcc’ instead of the static version. The most common of these is when the application wishes to throw and catch exceptions across different shared libraries. In that case, each of the libraries as well as the application itself should use the shared ‘libgcc’. " -} neededLinkArgs :: LinkerInfo -> [Option] neededLinkArgs (GnuLD o) = o neededLinkArgs (GnuGold o) = o neededLinkArgs (DarwinLD o) = o neededLinkArgs (SolarisLD o) = o neededLinkArgs (AixLD o) = o neededLinkArgs UnknownLD = [] -- Grab linker info and cache it in DynFlags. getLinkerInfo :: DynFlags -> IO LinkerInfo getLinkerInfo dflags = do info <- readIORef (rtldInfo dflags) case info of Just v -> return v Nothing -> do v <- getLinkerInfo' dflags writeIORef (rtldInfo dflags) (Just v) return v -- See Note [Run-time linker info]. getLinkerInfo' :: DynFlags -> IO LinkerInfo getLinkerInfo' dflags = do let platform = targetPlatform dflags os = platformOS platform (pgm,args0) = pgm_l dflags args1 = map Option (getOpts dflags opt_l) args2 = args0 ++ args1 args3 = filter notNull (map showOpt args2) -- Try to grab the info from the process output. parseLinkerInfo stdo _stde _exitc | any ("GNU ld" `isPrefixOf`) stdo = -- GNU ld specifically needs to use less memory. This especially -- hurts on small object files. Trac #5240. -- Set DT_NEEDED for all shared libraries. Trac #10110. -- TODO: Investigate if these help or hurt when using split sections. return (GnuLD $ map Option ["-Wl,--hash-size=31", "-Wl,--reduce-memory-overheads", -- ELF specific flag -- see Note [ELF needed shared libs] "-Wl,--no-as-needed"]) | any ("GNU gold" `isPrefixOf`) stdo = -- GNU gold only needs --no-as-needed. Trac #10110. -- ELF specific flag, see Note [ELF needed shared libs] return (GnuGold [Option "-Wl,--no-as-needed"]) -- Unknown linker. | otherwise = fail "invalid --version output, or linker is unsupported" -- Process the executable call info <- catchIO (do case os of OSSolaris2 -> -- Solaris uses its own Solaris linker. Even all -- GNU C are recommended to configure with Solaris -- linker instead of using GNU binutils linker. Also -- all GCC distributed with Solaris follows this rule -- precisely so we assume here, the Solaris linker is -- used. return $ SolarisLD [] OSAIX -> -- IBM AIX uses its own non-binutils linker as well return $ AixLD [] OSDarwin -> -- Darwin has neither GNU Gold or GNU LD, but a strange linker -- that doesn't support --version. We can just assume that's -- what we're using. return $ DarwinLD [] OSMinGW32 -> -- GHC doesn't support anything but GNU ld on Windows anyway. -- Process creation is also fairly expensive on win32, so -- we short-circuit here. return $ GnuLD $ map Option [ -- Reduce ld memory usage "-Wl,--hash-size=31" , "-Wl,--reduce-memory-overheads" -- Emit gcc stack checks -- Note [Windows stack usage] , "-fstack-check" -- Force static linking of libGCC -- Note [Windows static libGCC] , "-static-libgcc" ] _ -> do -- In practice, we use the compiler as the linker here. Pass -- -Wl,--version to get linker version info. (exitc, stdo, stde) <- readProcessEnvWithExitCode pgm (["-Wl,--version"] ++ args3) c_locale_env -- Split the output by lines to make certain kinds -- of processing easier. In particular, 'clang' and 'gcc' -- have slightly different outputs for '-Wl,--version', but -- it's still easy to figure out. parseLinkerInfo (lines stdo) (lines stde) exitc ) (\err -> do debugTraceMsg dflags 2 (text "Error (figuring out linker information):" <+> text (show err)) errorMsg dflags $ hang (text "Warning:") 9 $ text "Couldn't figure out linker information!" $$ text "Make sure you're using GNU ld, GNU gold" <+> text "or the built in OS X linker, etc." return UnknownLD) return info -- Grab compiler info and cache it in DynFlags. getCompilerInfo :: DynFlags -> IO CompilerInfo getCompilerInfo dflags = do info <- readIORef (rtccInfo dflags) case info of Just v -> return v Nothing -> do v <- getCompilerInfo' dflags writeIORef (rtccInfo dflags) (Just v) return v -- See Note [Run-time linker info]. getCompilerInfo' :: DynFlags -> IO CompilerInfo getCompilerInfo' dflags = do let (pgm,_) = pgm_c dflags -- Try to grab the info from the process output. parseCompilerInfo _stdo stde _exitc -- Regular GCC | any ("gcc version" `isInfixOf`) stde = return GCC -- Regular clang | any ("clang version" `isInfixOf`) stde = return Clang -- FreeBSD clang | any ("FreeBSD clang version" `isInfixOf`) stde = return Clang -- XCode 5.1 clang | any ("Apple LLVM version 5.1" `isPrefixOf`) stde = return AppleClang51 -- XCode 5 clang | any ("Apple LLVM version" `isPrefixOf`) stde = return AppleClang -- XCode 4.1 clang | any ("Apple clang version" `isPrefixOf`) stde = return AppleClang -- Unknown linker. | otherwise = fail "invalid -v output, or compiler is unsupported" -- Process the executable call info <- catchIO (do (exitc, stdo, stde) <- readProcessEnvWithExitCode pgm ["-v"] c_locale_env -- Split the output by lines to make certain kinds -- of processing easier. parseCompilerInfo (lines stdo) (lines stde) exitc ) (\err -> do debugTraceMsg dflags 2 (text "Error (figuring out C compiler information):" <+> text (show err)) errorMsg dflags $ hang (text "Warning:") 9 $ text "Couldn't figure out C compiler information!" $$ text "Make sure you're using GNU gcc, or clang" return UnknownCC) return info runLink :: DynFlags -> [Option] -> IO () runLink dflags args = do -- See Note [Run-time linker info] linkargs <- neededLinkArgs `fmap` getLinkerInfo dflags let (p,args0) = pgm_l dflags args1 = map Option (getOpts dflags opt_l) args2 = args0 ++ linkargs ++ args1 ++ args mb_env <- getGccEnv args2 runSomethingResponseFile dflags ld_filter "Linker" p args2 mb_env where ld_filter = case (platformOS (targetPlatform dflags)) of OSSolaris2 -> sunos_ld_filter _ -> id {- SunOS/Solaris ld emits harmless warning messages about unresolved symbols in case of compiling into shared library when we do not link against all the required libs. That is the case of GHC which does not link against RTS library explicitly in order to be able to choose the library later based on binary application linking parameters. The warnings look like: Undefined first referenced symbol in file stg_ap_n_fast ./T2386_Lib.o stg_upd_frame_info ./T2386_Lib.o templatezmhaskell_LanguageziHaskellziTHziLib_litE_closure ./T2386_Lib.o templatezmhaskell_LanguageziHaskellziTHziLib_appE_closure ./T2386_Lib.o templatezmhaskell_LanguageziHaskellziTHziLib_conE_closure ./T2386_Lib.o templatezmhaskell_LanguageziHaskellziTHziSyntax_mkNameGzud_closure ./T2386_Lib.o newCAF ./T2386_Lib.o stg_bh_upd_frame_info ./T2386_Lib.o stg_ap_ppp_fast ./T2386_Lib.o templatezmhaskell_LanguageziHaskellziTHziLib_stringL_closure ./T2386_Lib.o stg_ap_p_fast ./T2386_Lib.o stg_ap_pp_fast ./T2386_Lib.o ld: warning: symbol referencing errors this is actually coming from T2386 testcase. The emitting of those warnings is also a reason why so many TH testcases fail on Solaris. Following filter code is SunOS/Solaris linker specific and should filter out only linker warnings. Please note that the logic is a little bit more complex due to the simple reason that we need to preserve any other linker emitted messages. If there are any. Simply speaking if we see "Undefined" and later "ld: warning:..." then we omit all text between (including) the marks. Otherwise we copy the whole output. -} sunos_ld_filter :: String -> String sunos_ld_filter = unlines . sunos_ld_filter' . lines sunos_ld_filter' x = if (undefined_found x && ld_warning_found x) then (ld_prefix x) ++ (ld_postfix x) else x breakStartsWith x y = break (isPrefixOf x) y ld_prefix = fst . breakStartsWith "Undefined" undefined_found = not . null . snd . breakStartsWith "Undefined" ld_warn_break = breakStartsWith "ld: warning: symbol referencing errors" ld_postfix = tail . snd . ld_warn_break ld_warning_found = not . null . snd . ld_warn_break runLibtool :: DynFlags -> [Option] -> IO () runLibtool dflags args = do linkargs <- neededLinkArgs `fmap` getLinkerInfo dflags let args1 = map Option (getOpts dflags opt_l) args2 = [Option "-static"] ++ args1 ++ args ++ linkargs libtool = pgm_libtool dflags mb_env <- getGccEnv args2 runSomethingFiltered dflags id "Linker" libtool args2 Nothing mb_env runAr :: DynFlags -> Maybe FilePath -> [Option] -> IO () runAr dflags cwd args = do let ar = pgm_ar dflags runSomethingFiltered dflags id "Ar" ar args cwd Nothing askAr :: DynFlags -> Maybe FilePath -> [Option] -> IO String askAr dflags mb_cwd args = do let ar = pgm_ar dflags runSomethingWith dflags "Ar" ar args $ \real_args -> readCreateProcessWithExitCode' (proc ar real_args){ cwd = mb_cwd } runRanlib :: DynFlags -> [Option] -> IO () runRanlib dflags args = do let ranlib = pgm_ranlib dflags runSomethingFiltered dflags id "Ranlib" ranlib args Nothing Nothing runMkDLL :: DynFlags -> [Option] -> IO () runMkDLL dflags args = do let (p,args0) = pgm_dll dflags args1 = args0 ++ args mb_env <- getGccEnv (args0++args) runSomethingFiltered dflags id "Make DLL" p args1 Nothing mb_env runWindres :: DynFlags -> [Option] -> IO () runWindres dflags args = do let (gcc, gcc_args) = pgm_c dflags windres = pgm_windres dflags opts = map Option (getOpts dflags opt_windres) quote x = "\"" ++ x ++ "\"" args' = -- If windres.exe and gcc.exe are in a directory containing -- spaces then windres fails to run gcc. We therefore need -- to tell it what command to use... Option ("--preprocessor=" ++ unwords (map quote (gcc : map showOpt gcc_args ++ map showOpt opts ++ ["-E", "-xc", "-DRC_INVOKED"]))) -- ...but if we do that then if windres calls popen then -- it can't understand the quoting, so we have to use -- --use-temp-file so that it interprets it correctly. -- See #1828. : Option "--use-temp-file" : args mb_env <- getGccEnv gcc_args runSomethingFiltered dflags id "Windres" windres args' Nothing mb_env touch :: DynFlags -> String -> String -> IO () touch dflags purpose arg = runSomething dflags purpose (pgm_T dflags) [FileOption "" arg] copy :: DynFlags -> String -> FilePath -> FilePath -> IO () copy dflags purpose from to = copyWithHeader dflags purpose Nothing from to copyWithHeader :: DynFlags -> String -> Maybe String -> FilePath -> FilePath -> IO () copyWithHeader dflags purpose maybe_header from to = do showPass dflags purpose hout <- openBinaryFile to WriteMode hin <- openBinaryFile from ReadMode ls <- hGetContents hin -- inefficient, but it'll do for now. ToDo: speed up maybe (return ()) (header hout) maybe_header hPutStr hout ls hClose hout hClose hin where -- write the header string in UTF-8. The header is something like -- {-# LINE "foo.hs" #-} -- and we want to make sure a Unicode filename isn't mangled. header h str = do hSetEncoding h utf8 hPutStr h str hSetBinaryMode h True ----------------------------------------------------------------------------- -- Running an external program runSomething :: DynFlags -> String -- For -v message -> String -- Command name (possibly a full path) -- assumed already dos-ified -> [Option] -- Arguments -- runSomething will dos-ify them -> IO () runSomething dflags phase_name pgm args = runSomethingFiltered dflags id phase_name pgm args Nothing Nothing -- | Run a command, placing the arguments in an external response file. -- -- This command is used in order to avoid overlong command line arguments on -- Windows. The command line arguments are first written to an external, -- temporary response file, and then passed to the linker via @filepath. -- response files for passing them in. See: -- -- https://gcc.gnu.org/wiki/Response_Files -- https://ghc.haskell.org/trac/ghc/ticket/10777 runSomethingResponseFile :: DynFlags -> (String->String) -> String -> String -> [Option] -> Maybe [(String,String)] -> IO () runSomethingResponseFile dflags filter_fn phase_name pgm args mb_env = runSomethingWith dflags phase_name pgm args $ \real_args -> do fp <- getResponseFile real_args let args = ['@':fp] r <- builderMainLoop dflags filter_fn pgm args Nothing mb_env return (r,()) where getResponseFile args = do fp <- newTempName dflags TFL_CurrentModule "rsp" withFile fp WriteMode $ \h -> do #if defined(mingw32_HOST_OS) hSetEncoding h latin1 #else hSetEncoding h utf8 #endif hPutStr h $ unlines $ map escape args return fp -- Note: Response files have backslash-escaping, double quoting, and are -- whitespace separated (some implementations use newline, others any -- whitespace character). Therefore, escape any backslashes, newlines, and -- double quotes in the argument, and surround the content with double -- quotes. -- -- Another possibility that could be considered would be to convert -- backslashes in the argument to forward slashes. This would generally do -- the right thing, since backslashes in general only appear in arguments -- as part of file paths on Windows, and the forward slash is accepted for -- those. However, escaping is more reliable, in case somehow a backslash -- appears in a non-file. escape x = concat [ "\"" , concatMap (\c -> case c of '\\' -> "\\\\" '\n' -> "\\n" '\"' -> "\\\"" _ -> [c]) x , "\"" ] runSomethingFiltered :: DynFlags -> (String->String) -> String -> String -> [Option] -> Maybe FilePath -> Maybe [(String,String)] -> IO () runSomethingFiltered dflags filter_fn phase_name pgm args mb_cwd mb_env = do runSomethingWith dflags phase_name pgm args $ \real_args -> do r <- builderMainLoop dflags filter_fn pgm real_args mb_cwd mb_env return (r,()) runSomethingWith :: DynFlags -> String -> String -> [Option] -> ([String] -> IO (ExitCode, a)) -> IO a runSomethingWith dflags phase_name pgm args io = do let real_args = filter notNull (map showOpt args) cmdLine = showCommandForUser pgm real_args traceCmd dflags phase_name cmdLine $ handleProc pgm phase_name $ io real_args handleProc :: String -> String -> IO (ExitCode, r) -> IO r handleProc pgm phase_name proc = do (rc, r) <- proc `catchIO` handler case rc of ExitSuccess{} -> return r ExitFailure n -> throwGhcExceptionIO ( ProgramError ("`" ++ takeFileName pgm ++ "'" ++ " failed in phase `" ++ phase_name ++ "'." ++ " (Exit code: " ++ show n ++ ")")) where handler err = if IO.isDoesNotExistError err then does_not_exist else throwGhcExceptionIO (ProgramError $ show err) does_not_exist = throwGhcExceptionIO (InstallationError ("could not execute: " ++ pgm)) builderMainLoop :: DynFlags -> (String -> String) -> FilePath -> [String] -> Maybe FilePath -> Maybe [(String, String)] -> IO ExitCode builderMainLoop dflags filter_fn pgm real_args mb_cwd mb_env = do chan <- newChan -- We use a mask here rather than a bracket because we want -- to distinguish between cleaning up with and without an -- exception. This is to avoid calling terminateProcess -- unless an exception was raised. let safely inner = mask $ \restore -> do -- acquire (hStdIn, hStdOut, hStdErr, hProcess) <- restore $ runInteractiveProcess pgm real_args mb_cwd mb_env let cleanup_handles = do hClose hStdIn hClose hStdOut hClose hStdErr r <- try $ restore $ do hSetBuffering hStdOut LineBuffering hSetBuffering hStdErr LineBuffering let make_reader_proc h = forkIO $ readerProc chan h filter_fn bracketOnError (make_reader_proc hStdOut) killThread $ \_ -> bracketOnError (make_reader_proc hStdErr) killThread $ \_ -> inner hProcess case r of -- onException Left (SomeException e) -> do terminateProcess hProcess cleanup_handles throw e -- cleanup when there was no exception Right s -> do cleanup_handles return s safely $ \h -> do -- we don't want to finish until 2 streams have been complete -- (stdout and stderr) log_loop chan (2 :: Integer) -- after that, we wait for the process to finish and return the exit code. waitForProcess h where -- t starts at the number of streams we're listening to (2) decrements each -- time a reader process sends EOF. We are safe from looping forever if a -- reader thread dies, because they send EOF in a finally handler. log_loop _ 0 = return () log_loop chan t = do msg <- readChan chan case msg of BuildMsg msg -> do putLogMsg dflags NoReason SevInfo noSrcSpan (defaultUserStyle dflags) msg log_loop chan t BuildError loc msg -> do putLogMsg dflags NoReason SevError (mkSrcSpan loc loc) (defaultUserStyle dflags) msg log_loop chan t EOF -> log_loop chan (t-1) readerProc :: Chan BuildMessage -> Handle -> (String -> String) -> IO () readerProc chan hdl filter_fn = (do str <- hGetContents hdl loop (linesPlatform (filter_fn str)) Nothing) `finally` writeChan chan EOF -- ToDo: check errors more carefully -- ToDo: in the future, the filter should be implemented as -- a stream transformer. where loop [] Nothing = return () loop [] (Just err) = writeChan chan err loop (l:ls) in_err = case in_err of Just err@(BuildError srcLoc msg) | leading_whitespace l -> do loop ls (Just (BuildError srcLoc (msg $$ text l))) | otherwise -> do writeChan chan err checkError l ls Nothing -> do checkError l ls _ -> panic "readerProc/loop" checkError l ls = case parseError l of Nothing -> do writeChan chan (BuildMsg (text l)) loop ls Nothing Just (file, lineNum, colNum, msg) -> do let srcLoc = mkSrcLoc (mkFastString file) lineNum colNum loop ls (Just (BuildError srcLoc (text msg))) leading_whitespace [] = False leading_whitespace (x:_) = isSpace x parseError :: String -> Maybe (String, Int, Int, String) parseError s0 = case breakColon s0 of Just (filename, s1) -> case breakIntColon s1 of Just (lineNum, s2) -> case breakIntColon s2 of Just (columnNum, s3) -> Just (filename, lineNum, columnNum, s3) Nothing -> Just (filename, lineNum, 0, s2) Nothing -> Nothing Nothing -> Nothing breakColon :: String -> Maybe (String, String) breakColon xs = case break (':' ==) xs of (ys, _:zs) -> Just (ys, zs) _ -> Nothing breakIntColon :: String -> Maybe (Int, String) breakIntColon xs = case break (':' ==) xs of (ys, _:zs) | not (null ys) && all isAscii ys && all isDigit ys -> Just (read ys, zs) _ -> Nothing data BuildMessage = BuildMsg !SDoc | BuildError !SrcLoc !SDoc | EOF {- ************************************************************************ * * \subsection{Support code} * * ************************************************************************ -} ----------------------------------------------------------------------------- -- Define getBaseDir :: IO (Maybe String) getBaseDir :: IO (Maybe String) #if defined(mingw32_HOST_OS) -- Assuming we are running ghc, accessed by path $(stuff)//ghc.exe, -- return the path $(stuff)/lib. getBaseDir = try_size 2048 -- plenty, PATH_MAX is 512 under Win32. where try_size size = allocaArray (fromIntegral size) $ \buf -> do ret <- c_GetModuleFileName nullPtr buf size case ret of 0 -> return Nothing _ | ret < size -> do path <- peekCWString buf real <- getFinalPath path -- try to resolve symlinks paths let libdir = (rootDir . sanitize . maybe path id) real exists <- doesDirectoryExist libdir if exists then return $ Just libdir else fail path | otherwise -> try_size (size * 2) -- getFinalPath returns paths in full raw form. -- Unfortunately GHC isn't set up to handle these -- So if the call succeeded, we need to drop the -- \\?\ prefix. sanitize s = if "\\\\?\\" `isPrefixOf` s then drop 4 s else s rootDir s = case splitFileName $ normalise s of (d, ghc_exe) | lower ghc_exe `elem` ["ghc.exe", "ghc-stage1.exe", "ghc-stage2.exe", "ghc-stage3.exe"] -> case splitFileName $ takeDirectory d of -- ghc is in $topdir/bin/ghc.exe (d', _) -> takeDirectory d' "lib" _ -> fail s fail s = panic ("can't decompose ghc.exe path: " ++ show s) lower = map toLower foreign import WINDOWS_CCONV unsafe "windows.h GetModuleFileNameW" c_GetModuleFileName :: Ptr () -> CWString -> Word32 -> IO Word32 -- Attempt to resolve symlinks in order to find the actual location GHC -- is located at. See Trac #11759. getFinalPath :: FilePath -> IO (Maybe FilePath) getFinalPath name = do dllHwnd <- failIfNull "LoadLibrary" $ loadLibrary "kernel32.dll" -- Note: The API GetFinalPathNameByHandleW is only available starting from Windows Vista. -- This means that we can't bind directly to it since it may be missing. -- Instead try to find it's address at runtime and if we don't succeed consider the -- function failed. addr_m <- (fmap Just $ failIfNull "getProcAddress" $ getProcAddress dllHwnd "GetFinalPathNameByHandleW") `catch` (\(_ :: SomeException) -> return Nothing) case addr_m of Nothing -> return Nothing Just addr -> do handle <- failIf (==iNVALID_HANDLE_VALUE) "CreateFile" $ createFile name gENERIC_READ fILE_SHARE_READ Nothing oPEN_EXISTING (fILE_ATTRIBUTE_NORMAL .|. fILE_FLAG_BACKUP_SEMANTICS) Nothing let fnPtr = makeGetFinalPathNameByHandle $ castPtrToFunPtr addr -- First try to resolve the path to get the actual path -- of any symlinks or other file system redirections that -- may be in place. However this function can fail, and in -- the event it does fail, we need to try using the -- original path and see if we can decompose that. -- If the call fails Win32.try will raise an exception -- that needs to be caught. See #14159 path <- (Win32.try "GetFinalPathName" (\buf len -> fnPtr handle buf len 0) 512 `finally` closeHandle handle) `catch` (\(_ :: IOException) -> return name) return $ Just path type GetFinalPath = HANDLE -> LPTSTR -> DWORD -> DWORD -> IO DWORD foreign import WINDOWS_CCONV unsafe "dynamic" makeGetFinalPathNameByHandle :: FunPtr GetFinalPath -> GetFinalPath #else getBaseDir = return Nothing #endif -- Divvy up text stream into lines, taking platform dependent -- line termination into account. linesPlatform :: String -> [String] #if !defined(mingw32_HOST_OS) linesPlatform ls = lines ls #else linesPlatform "" = [] linesPlatform xs = case lineBreak xs of (as,xs1) -> as : linesPlatform xs1 where lineBreak "" = ("","") lineBreak ('\r':'\n':xs) = ([],xs) lineBreak ('\n':xs) = ([],xs) lineBreak (x:xs) = let (as,bs) = lineBreak xs in (x:as,bs) #endif linkDynLib :: DynFlags -> [String] -> [InstalledUnitId] -> IO () linkDynLib dflags0 o_files dep_packages = do let -- This is a rather ugly hack to fix dynamically linked -- GHC on Windows. If GHC is linked with -threaded, then -- it links against libHSrts_thr. But if base is linked -- against libHSrts, then both end up getting loaded, -- and things go wrong. We therefore link the libraries -- with the same RTS flags that we link GHC with. dflags1 = if cGhcThreaded then addWay' WayThreaded dflags0 else dflags0 dflags2 = if cGhcDebugged then addWay' WayDebug dflags1 else dflags1 dflags = updateWays dflags2 verbFlags = getVerbFlags dflags o_file = outputFile dflags pkgs <- getPreloadPackagesAnd dflags dep_packages let pkg_lib_paths = collectLibraryPaths dflags pkgs let pkg_lib_path_opts = concatMap get_pkg_lib_path_opts pkg_lib_paths get_pkg_lib_path_opts l | ( osElfTarget (platformOS (targetPlatform dflags)) || osMachOTarget (platformOS (targetPlatform dflags)) ) && dynLibLoader dflags == SystemDependent && WayDyn `elem` ways dflags = ["-L" ++ l, "-Xlinker", "-rpath", "-Xlinker", l] -- See Note [-Xlinker -rpath vs -Wl,-rpath] | otherwise = ["-L" ++ l] let lib_paths = libraryPaths dflags let lib_path_opts = map ("-L"++) lib_paths -- We don't want to link our dynamic libs against the RTS package, -- because the RTS lib comes in several flavours and we want to be -- able to pick the flavour when a binary is linked. -- On Windows we need to link the RTS import lib as Windows does -- not allow undefined symbols. -- The RTS library path is still added to the library search path -- above in case the RTS is being explicitly linked in (see #3807). let platform = targetPlatform dflags os = platformOS platform pkgs_no_rts = case os of OSMinGW32 -> pkgs _ -> filter ((/= rtsUnitId) . packageConfigId) pkgs let pkg_link_opts = let (package_hs_libs, extra_libs, other_flags) = collectLinkOpts dflags pkgs_no_rts in package_hs_libs ++ extra_libs ++ other_flags -- probably _stub.o files -- and last temporary shared object file let extra_ld_inputs = ldInputs dflags -- frameworks pkg_framework_opts <- getPkgFrameworkOpts dflags platform (map unitId pkgs) let framework_opts = getFrameworkOpts dflags platform case os of OSMinGW32 -> do ------------------------------------------------------------- -- Making a DLL ------------------------------------------------------------- let output_fn = case o_file of Just s -> s Nothing -> "HSdll.dll" runLink dflags ( map Option verbFlags ++ [ Option "-o" , FileOption "" output_fn , Option "-shared" ] ++ [ FileOption "-Wl,--out-implib=" (output_fn ++ ".a") | gopt Opt_SharedImplib dflags ] ++ map (FileOption "") o_files -- Permit the linker to auto link _symbol to _imp_symbol -- This lets us link against DLLs without needing an "import library" ++ [Option "-Wl,--enable-auto-import"] ++ extra_ld_inputs ++ map Option ( lib_path_opts ++ pkg_lib_path_opts ++ pkg_link_opts )) _ | os == OSDarwin -> do ------------------------------------------------------------------- -- Making a darwin dylib ------------------------------------------------------------------- -- About the options used for Darwin: -- -dynamiclib -- Apple's way of saying -shared -- -undefined dynamic_lookup: -- Without these options, we'd have to specify the correct -- dependencies for each of the dylibs. Note that we could -- (and should) do without this for all libraries except -- the RTS; all we need to do is to pass the correct -- HSfoo_dyn.dylib files to the link command. -- This feature requires Mac OS X 10.3 or later; there is -- a similar feature, -flat_namespace -undefined suppress, -- which works on earlier versions, but it has other -- disadvantages. -- -single_module -- Build the dynamic library as a single "module", i.e. no -- dynamic binding nonsense when referring to symbols from -- within the library. The NCG assumes that this option is -- specified (on i386, at least). -- -install_name -- Mac OS/X stores the path where a dynamic library is (to -- be) installed in the library itself. It's called the -- "install name" of the library. Then any library or -- executable that links against it before it's installed -- will search for it in its ultimate install location. -- By default we set the install name to the absolute path -- at build time, but it can be overridden by the -- -dylib-install-name option passed to ghc. Cabal does -- this. ------------------------------------------------------------------- let output_fn = case o_file of { Just s -> s; Nothing -> "a.out"; } instName <- case dylibInstallName dflags of Just n -> return n Nothing -> return $ "@rpath" `combine` (takeFileName output_fn) runLink dflags ( map Option verbFlags ++ [ Option "-dynamiclib" , Option "-o" , FileOption "" output_fn ] ++ map Option o_files ++ [ Option "-undefined", Option "dynamic_lookup", Option "-single_module" ] ++ (if platformArch platform == ArchX86_64 then [ ] else [ Option "-Wl,-read_only_relocs,suppress" ]) ++ [ Option "-install_name", Option instName ] ++ map Option lib_path_opts ++ extra_ld_inputs ++ map Option framework_opts ++ map Option pkg_lib_path_opts ++ map Option pkg_link_opts ++ map Option pkg_framework_opts ) _ -> do ------------------------------------------------------------------- -- Making a DSO ------------------------------------------------------------------- let output_fn = case o_file of { Just s -> s; Nothing -> "a.out"; } let bsymbolicFlag = -- we need symbolic linking to resolve -- non-PIC intra-package-relocations ["-Wl,-Bsymbolic"] runLink dflags ( map Option verbFlags ++ libmLinkOpts ++ [ Option "-o" , FileOption "" output_fn ] ++ map Option o_files ++ [ Option "-shared" ] ++ map Option bsymbolicFlag -- Set the library soname. We use -h rather than -soname as -- Solaris 10 doesn't support the latter: ++ [ Option ("-Wl,-h," ++ takeFileName output_fn) ] ++ extra_ld_inputs ++ map Option lib_path_opts ++ map Option pkg_lib_path_opts ++ map Option pkg_link_opts ) -- | Some platforms require that we explicitly link against @libm@ if any -- math-y things are used (which we assume to include all programs). See #14022. libmLinkOpts :: [Option] libmLinkOpts = #if defined(HAVE_LIBM) [Option "-lm"] #else [] #endif getPkgFrameworkOpts :: DynFlags -> Platform -> [InstalledUnitId] -> IO [String] getPkgFrameworkOpts dflags platform dep_packages | platformUsesFrameworks platform = do pkg_framework_path_opts <- do pkg_framework_paths <- getPackageFrameworkPath dflags dep_packages return $ map ("-F" ++) pkg_framework_paths pkg_framework_opts <- do pkg_frameworks <- getPackageFrameworks dflags dep_packages return $ concat [ ["-framework", fw] | fw <- pkg_frameworks ] return (pkg_framework_path_opts ++ pkg_framework_opts) | otherwise = return [] getFrameworkOpts :: DynFlags -> Platform -> [String] getFrameworkOpts dflags platform | platformUsesFrameworks platform = framework_path_opts ++ framework_opts | otherwise = [] where framework_paths = frameworkPaths dflags framework_path_opts = map ("-F" ++) framework_paths frameworks = cmdlineFrameworks dflags -- reverse because they're added in reverse order from the cmd line: framework_opts = concat [ ["-framework", fw] | fw <- reverse frameworks ]