Hi Malcom,
On 23.04.2010, at 16:45, Wallace, Malcolm wrote:
>> Another problem is that the cabal-generated commandline for
>> gtk2hsC2hs uses Windows-style backslashes for relative
>> filepaths. This seems like a very weird interaction with MinGW
>
> OK, scratch that. I realised today that you cannot simply cut-n-paste
> the output of "cabal build -v" into an Msys shell and expect it to
> work,
> because Cabal of course is not using a shell (with associated
> quotation
> mechanisms), but rather System.Cmd.rawSystem.
>
Too bad! I already had a patch that would simply pass absolute
filenames to c2hs.
> So, investigating in ghci, by converting the output of "cabal build -
> v"
> manually into the equivalent call to rawSystem, and adjusting the
> error
> printing mechanism of gtk2hsC2hs to, I see that the _real_ error is
> this:
>
> gtk2hsC2hs.exe: does not exist
> dist\build\System\Glib/System\Glib\GValue.hs:
> openFile: does not exist (No such file or directory)
> ExitFailure 1
>
> Somehow, the output location is not being formed correctly. Is the
> following pair of arguments correct, in the generated call to
> gtk2hsC2hs?
>
> --output-dir=dist\build\System\Glib
> --output=System\Glib\GValue.hs
>
> because it seems to me that when you stick them together, you get the
> path reported by gtk2hsC2hs as not existing.
>
c2hs has some very weird path mangling in it since it was written
before hierarchical module names were commonplace.
What I found was that it strips the path from the output file (thus,
System\Glib\GValue.hs becomes GValue.hs) and then prepends the output
dir. It could be that the function stripping this path only works on
Unix file paths but not on Windows paths. Instead of fixing the wicked
inner workings of c2hs, I adjusted the Setup.hs programs to just pass
in the file name.
I pushed a patch. Can you pull it and try again?
Thanks for your excellent diagnosis,
Axel
> Regards,
> Malcolm
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