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

[Thomas Schilling]

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.html#v%3Alog_action

On 20 May 2010 19:05, Phyx <lonetiger at gmail.com> 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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