Re: [Haskell-cafe] making the GHC Api not write to stderr

Have you tried freopen on stderr? On Fri, May 21, 2010 at 8:43 AM, Phyx wrote:

Hi, I tried that, setting it to (\_ _ _ _ -> return ()) and it still did the same, also tried setting it to undefined to see whether the code that's printing the error is using it, and it didn't crash So I assume it's not.

----------- *VsxParser> getModInfo True "C:\\Users\\Phyx\\AppData\\Local\\Temp\\tmp5600.hs" "" >> return ()

C:\Users\Phyx\AppData\Local\Temp\tmp5600.hs:11:13: parse error on input `=' Printf ---------

I think parseModule might still have a hardcoded print statement in it.

-----Original Message----- From: Thomas Schilling [mailto:nominolo@googlemail.com] Sent: Friday, May 21, 2010 12:53 To: Phyx Cc: haskell-cafe@haskell.org Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr

You could try changing the log_action[1] member of the DynFlags. A while ago I turned most printed errors into some form of error message, but I wouldn't be surprised if I missed some places. All output should go through log_action, though, so try changing that to intercept any output.

[1]:

http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h tml#v%3Alog_action

On 20 May 2010 19:05, Phyx wrote:

...

I was wondering how to forcibly quiet down the API. I have a custom handler in place, but when I call the function on failure both my handler gets called and somewhere somehow errors get printed to the stderr, which I really need to avoid.

My current code looks like

getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)

getModInfo qual file path = handleSourceError processErrors $

runGhc (Just libdir) $ do

dflags <- getSessionDynFlags

setSessionDynFlags $ configureDynFlags dflags

target <- guessTarget file Nothing

addTarget target

setSessionDynFlags $ dflags { importPaths = [path] }

load LoadAllTargets

graph <- depanal [] False

let modifier = moduleName . ms_mod

modName = modifier $ head graph

includes = includePaths dflags

imports = importPaths dflags

dflags' <- Debug.trace (moduleNameString modName) getSessionDynFlags

setSessionDynFlags $ dflags' { includePaths = path:includes

, importPaths = path:imports

}

parsed <- parse modName

checked <- typecheckModule parsed

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