#16259: Hadrian does not work with a cabal v2-installed "Happy" -------------------------------------+------------------------------------- Reporter: RolandSenn | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 8.6.3 (Hadrian) | Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Building GHC | Unknown/Multiple failed | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by hvr): Ok, so the problem here is that `happy` gets demoted into an inplace package (and this basically means that the resulting executable can't be invoked without setting a couple of env-vars, which `cabal {run,exec}` would do -- but if you don't invoke it that way you'd be responsible for doing this... long story), because it picked up a local dependency, namely the intree-`Cabal` for its `setup-depends`; a simple way to workaround this is inject a constraint to prevent Setup.hs scripts from using an unreleased version of lib:Cabal, via e.g. {{{#!diff diff --git a/hadrian/cabal.project b/hadrian/cabal.project index 176d1ee..d8e5e79 100644 --- a/hadrian/cabal.project +++ b/hadrian/cabal.project @@ -1,2 +1,4 @@ packages: ./ ../libraries/Cabal/Cabal/ + +constraints: setup.Cabal < 2.5 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16259#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler