This is from a limitation/bug with Cabal-the-library, in that there
are typically no dependency checks for custom Setup.[l]hs
configurations.
wxc has such a custom one:
http://hackage.haskell.org/package/wxc-0.92.3.0/src/Setup.hs
versionBranch is from Data.Version in base, and it appears that the in
this GHC pre-release there's been a change in base that removed this
function.
On 4 June 2017 at 19:45, Henk-Jan van Tuyl
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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