Commit 6ca6a360 authored by Andreas Klebinger's avatar Andreas Klebinger Committed by Ben Gamari

base: Add handling of -- to getArgs for Windows

getArgs didn't match the treatmeant of -- in the RTS leading to
inconsistencies between behavior on Windows and other platforms. See #13287.

Reviewers: austin, hvr, bgamari, erikd, simonmar, rwbarton

Reviewed By: bgamari, rwbarton

Subscribers: rwbarton, thomie

Differential Revision:
parent 7d116e55
......@@ -67,12 +67,24 @@ import System.Environment.ExecutablePath
#ifdef mingw32_HOST_OS
-- Ignore the arguments to hs_init on Windows for the sake of Unicode compat
Note [Ignore hs_init argv]
Ignore the arguments to hs_init on Windows for the sake of Unicode compat
Instead on Windows we get the list of arguments from getCommandLineW and
filter out arguments which the RTS would not have passed along.
This is done to ensure we get the arguments in proper Unicode Encoding which
the RTS at this moment does not seem provide. The filtering has to match the
one done by the RTS to avoid inconsistencies like #13287.
getWin32ProgArgv_certainly :: IO [String]
getWin32ProgArgv_certainly = do
mb_argv <- getWin32ProgArgv
case mb_argv of
-- see Note [Ignore hs_init argv]
Nothing -> fmap dropRTSArgs getFullArgs
Just argv -> return argv
......@@ -106,8 +118,10 @@ foreign import ccall unsafe "getWin32ProgArgv"
foreign import ccall unsafe "setWin32ProgArgv"
c_setWin32ProgArgv :: CInt -> Ptr CWString -> IO ()
-- See Note [Ignore hs_init argv]
dropRTSArgs :: [String] -> [String]
dropRTSArgs [] = []
dropRTSArgs rest@("--":_) = rest
dropRTSArgs ("+RTS":rest) = dropRTSArgs (dropWhile (/= "-RTS") rest)
dropRTSArgs ("--RTS":rest) = rest
dropRTSArgs ("-RTS":rest) = dropRTSArgs rest
......@@ -512,6 +512,13 @@ static void errorRtsOptsDisabled(const char *s)
- rtsConfig (global) contains the supplied RtsConfig
On Windows getArgs ignores argv and instead takes the arguments directly
from the WinAPI and removes any which would have been parsed by the RTS.
If the handling of which arguments are passed to the Haskell side changes
these changes have to be synchronized with getArgs in base. See #13287 and
Note [Ignore hs_init argv] in System.Environment.
-------------------------------------------------------------------------- */
void setupRtsFlags (int *argc, char *argv[], RtsConfig rts_config)
......@@ -566,7 +573,7 @@ void setupRtsFlags (int *argc, char *argv[], RtsConfig rts_config)
// Split arguments (argv) into PGM (argv) and RTS (rts_argv) parts
// argv[0] must be PGM argument -- leave in argv
for (mode = PGM; arg < total_arg; arg++) {
// The '--RTS' argument disables all future +RTS ... -RTS processing.
if (strequal("--RTS", argv[arg])) {
import System.Environment (getArgs)
main :: IO ()
main = getArgs >>= print
# Ensure that RTS flags past -- get ignored
test('T13287', [extra_run_opts('a1 +RTS -RTS -- a2 +RTS -RTS a3'), omit_ways(['ghci'])], compile_and_run, [''])
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