#13313: cabal08 broken -------------------------------------+------------------------------------- Reporter: bgamari | Owner: ezyang Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 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 ezyang): Yes, I've diagnosed the problem. The trouble is that the new algorithm for computing package shadowing doesn't remember the order packages were specified in package databases, so it doesn't respect the flag ordering; instead, it relies entirely on the (deterministic) comparison of unit identifiers. Probably the reason why this wobbled is because Cabal was allocating different unit identifiers on different platforms, causing the (deterministic) comparison to wobble, so that we picked one or another. It would be very good to fix this in time for GHC 8.2. However, fixing this seems a bit annoying in the current algorithm, because there isn't really a good way to remember the package ordering after we suck all the packages into an InstalledPackageIndex. I'll work on a fix this weekend. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13313#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler