[oops, forgot to cc ghc-devs] Hi Janek, On 15/04/15 13:20, Jan Stolarek wrote:
Once I compile GHC I use the "cd ghc; make 2" trick to re-compile any changes. That however does not work if my code changes modify the format of interface files - the resulting compiler is unusable. In fact the only way to get a working compiler after interface format change that I am aware of is to rebuild everything from scratch. Needless to say, this takes a lot of time. Is there a better way?
I hit this problem quite often as well, but unfortunately don't know of a general solution other than rebuilding everything.
I'd like to test D841 but if this means rebuilding everything then I'll have to pass.
In the case of D841, the interface file changes are very minor (specifically, a new tag is used when an empty closed type family is compiled, but of course none of them exist yet). Thus you might be able to get away without a full rebuild. (I think ./configure incorporates some git revision data into the interface file version number, so presumably you have to avoid that as well.) All the best, Adam -- Adam Gundry, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/