#12485: -package-db flags now need to be sorted by dependency order -------------------------------------+------------------------------------- Reporter: niteria | Owner: Type: bug | Status: patch Priority: normal | Milestone: 8.0.3 Component: Package system | 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): phab:D2613 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonmar): @duncan in practice the keys will often be strong enough. However, there are a couple of reasons why we can end up with package builds that have the same key but are incompatible. * Prior to GHC 8.0.2 non-determinism meant that the key did not determine the ABI * We don't want the key to be a function of the source code, because that would entail too much recompilation during development. For this reason, the GHC build system picks deterministic package keys, and I believe Cabal doesn't hash the source code to compute the package key (but I just gave up trying to confirm that after trawling through the Cabal source code for a few minutes which seems to have got terrifyingly complex since I last looked at it!) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12485#comment:35 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler