#400: fail and warnings for build configurations ----------------------------+----------------------------------------------- Reporter: duncan | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: Cabal library | Version: Severity: normal | Keywords: Difficulty: normal | Ghcversion: 6.8.3 Platform: | ----------------------------+----------------------------------------------- People expect `buildable: False` to fail the current configuration (rather than letting it configure and then not working at build time). But perhaps we should make that more explicit and allow a message, eg instead of: {{{ if os(windows) buildable: False }}} allow {{{ if os(windows) fail: it doesn't work on windows because, blah blah blah }}} And similarly we might want to warn users about selecting particular configurations eg: {{{ if flag(http) ... else warn: no http implementation selected, only local operations will be possible. You probably really want some http implementation. }}} The semantics roughly is that it's a workable but sub-optimal configuration. The solver should try to avoid warnings, by selecting another alternative. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/400 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects