On 15/05/2009 10:36, Neil Mitchell wrote:

Hi,

Attached is a patch to give more informative failure messages in the Win32 package. Currently we get:

$ ghci GHCi, version 6.10.2: http://www.haskell.org/ghc/ :? for help Prelude> :m System.Directory Prelude System.Directory> removeFile "wibble" *** Exception: DeleteFile: does not exist (The system cannot find the file speci fied.) Prelude System.Directory> removeFile "c:/ghc/ghc-6.10.2/bin/ghci.exe" *** Exception: DeleteFile: permission denied (Access is denied.)

Now, we should get:

*** Exception: DeleteFile "wibble": does not exist (The system cannot find the file specified.) *** Exception: DeleteFile "c:/ghc/ghc-6.10.2/bin/ghci.exe": permission denied (Access is denied.)

Nice.

I have compiled the patches, but not tested them. When I do, I get errors about linking, which I'm pretty sure have nothing to do with my patch.

: C:\Program Files\Haskell\Win32-2.2.0.0\ghc-6.10.2\HSWin32-2.2.0.0.o: unknown s ymbol `___stginit_basezm3zi0zi3zi1_Foreign_'

I suspect it's because Win32 is built and distributed with GHC.

Also, I noticed that:

$ cabal install Win32 --global --reinstall System\Win32\SimpleMAPI.hsc:16:63: Module `Control.Exception' does not export `onException' cabal: Error: some packages failed to install: Win32-2.2.0.0 failed during the building phase. The exception was: exit: ExitFailure 1

That is a bad idea, since other packages depend on Win32, and you just broke them. We did make a half-hearted attempt to stop you doing this in ghc-pkg, but that's not the right place (or at least, not the only place that needs to be fixed). http://hackage.haskell.org/trac/ghc/ticket/3090

I'm now left with a dead version of GHC - for future reference, is there a sequence of steps that would have worked to install Win32 and start using the new one?

You'd need to bump the version number and install the new one. Cheers, Simon