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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