#120: misleading error message from cabal when versions differ -----------------------------+---------------------------------------------- Reporter: igloo@earth.li | Owner: Type: defect | Status: closed Priority: normal | Milestone: Component: Cabal library | Version: 1.1.6 Severity: normal | Resolution: fixed Keywords: | Difficulty: easy (<4 hours) Ghcversion: 6.6 | Platform: Linux -----------------------------+---------------------------------------------- Changes (by duncan): * status: new => closed * resolution: => fixed Comment: It now adds a header to the file and checks it again when reading. The header is a line like: {{{ Saved package config for foo-1.0 written by Cabal-1.3.7 using ghc-6.8 }}} It checks this header when reading back the config. If the Cabal versions do not match you'll get this error: {{{ cabal: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.3.6, now Cabal-1.3.7). }}} If additionally the compiler versions do not match then you get: {{{ cabal: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.3.6, now Cabal-1.3.7). Additionally the compiler is different (was ghc-6.8, now ghc-6.9) which is probably the cause of the problem. }}} Of course it does not help for older Cabal versions which lacked this check but it's the best we can do and should help in future. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/120#comment:2 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects