#12518: Allow customizing immutable package dbs by stacking -------------------------------------+------------------------------------- Reporter: harendra | Owner: Type: feature request | Status: new Priority: normal | Milestone: 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): Wiki Page: | -------------------------------------+------------------------------------- Comment (by harendra): The intent of this issue was to provide an alternative `stacked` db composing policy in addition to the default `union` composing policy. Though, as you suggested, it can be implemented in terms of existing primitives by first specifying a list of dbs and then explicitly specifying the overriding packages using `-package pkg-x.y.z` flags in an environment file. That might mean specifying a lot of `-package` flags in the environment file though. We will have to explicitly identify and specify all the packages which override other packages in any of the lower dbs in the db stack. I guess it should do the job if we do not want to have a built-in stacked db policy. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12518#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler