#16120: Hadrian should use cabal build-tools installed Alex and Happy if necessary -------------------------------------+------------------------------------- Reporter: adamse | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Build System | Version: 8.6.3 (Hadrian) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by snowleopard): Yes, we can run these Cabal commands and obtain the output using Shake's `cmd` function: https://hackage.haskell.org/package/shake-0.17.3/docs/Development- Shake.html#v:cmd In particular, see the example with `Stdout out <- cmd ...`. However, this makes Cabal a dependency of Hadrian even for users who are building Hadrian using Stack (e.g. using the `build.stack.bat` script). Could we instead use Hadrian's built-in path resolver `lookupInPath`? Have a look here: https://gitlab.haskell.org/ghc/ghc/blob/master/hadrian/src/Hadrian/Oracles/P... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16120#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler