[Haskell-cafe] Bug in GHC or cabal-install?

[Henk-Jan van Tuyl]

I have attached the -v3 log.

Regards,
Henk-Jan van Tuyl


On Wed, 07 Jun 2017 13:56:12 +0200, Edward Z. Yang <ezyang at mit.edu> wrote:

> This sounds like a Cabal bug to me. A few things to try:
>
> - Can you post a -v3 log of the second cabal install force
>   reinstall somewhere?  It sounds like we are incorrectly
>   attempting to use the wrong version of Cabal to build the
>   Setup script, and a -v3 log would help confirm.
>
> - Are you on Ubuntu?  If you could install and test a cabal-install-head
>   binary from https://launchpad.net/~hvr/+archive/ubuntu/ghc
>   that would be helpful to find out if we've fixed this bug
>   already.
>
> - If you want to file a bug, please do so in the Cabal
>   bug tracker https://github.com/haskell/cabal/issues
>   Thanks!
>
> Cheers,
> Edward
>
> Excerpts from Henk-Jan van Tuyl's message of 2017-06-04 11:45:58 +0200:
>>
>> L.S.,
>>
>> I am trying the prerelease of GHC, version 8.2.0.20170507
>>
>> I adapted wxHaskell to the new packages that come with the new GHC and  
>> it
>> compiles now, but only the first time. If I compile it a second time,  
>> even
>> if nothing has changed, the information from the custom-setup section of
>> the wxc.cabal file seems to be forgotten. This section looks like this:
>>
>> custom-setup
>>    setup-depends:
>>      base,
>>      Cabal < 2,
>>      containers,
>>      bytestring,
>>      split,
>>      process,
>>      directory,
>>      filepath
>> (I am using cabal-install 1.24.0.2)
>>
>> Output from the second time I try to install wxHaskell:
>>
>> > cabal install --force-reinstalls --reinstall wxdirect wxc wxcore wx
>> [1 of 1] Compiling Main             (
>> X:\Temp\wxHaskell\wxcore\dist\setup\setup.hs,
>> X:\Temp\wxHaskell\wxcore\dist\setup\Main.o )
>> Linking X:\Temp\wxHaskell\wxcore\dist\setup\setup.exe ...
>> [1 of 1] Compiling Main             (
>> X:\Temp\wxHaskell\wxc\dist\setup\setup.hs,
>> X:\Temp\wxHaskell\wxc\dist\setup\Main.o )
>>
>> X:\Temp\wxHaskell\wxc\dist\setup\setup.hs:505:61: error:
>>                        Variable not in scope: versionBranch :: Version  
>> ->
>> [a0]
>>                        |
>> 505 |           full_ver = (concat . intersperse "." . map show .
>> versionBranch) ver
>>                        |
>> ^^^^^^^^^^^^^
>>
>> This error message indicates that the wrong version of Cabal (2.0) is  
>> used
>> to compile the wxcore setup.hs
>> It looks like a cabal-install bug, but this does not happen when I
>> use GHC 8.0.2; should I write a GHC bug ticket?
>>
>> Regards,
>> Henk-Jan van Tuyl


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