On 2014-07-29 at 14:13:22 +0200, Richard Eisenberg wrote:
Are folks very keen to have *warning-free* compilation on several GHC versions? Personally, I would aim for warning-free compilation on a most recent version, and otherwise successful compilation on older versions.
IMO: In typical build-bot configurations where you test against multiple GHC versions you often the warnings to be turned into errors via -Werror, as otherwise you wouldn't notice them. After all, warnings are hints about something that may need to be looked at, and if they turn out to be harmless, the specific warning can be turned off on a case-by-case basis (which alas, in GHC's case is a bit difficult, as for instance, you can't turn off a specific warning for a single declaration only, but only for a whole module) Cheers, hvr