Thanks, I added my two cents to the ticket.
On Thu, Aug 3, 2017 at 12:37 PM, George Colpitts <george.colpi...@gmail.com> wrote: > I reported this in https://ghc.haskell.org/trac/ghc/ticket/13604 > > On Thu, Aug 3, 2017 at 4:32 PM Evan Laforge <qdun...@gmail.com> wrote: >> >> My program uses the GHC API to provide a REPL, and upgrading to 8.2.1 >> broke that... well, just made it really slow. Where it used to >> quickly load the compiled files, it now wants to recompile everything >> as bytecode which makes 1s startup time go to 1m. The reason was it >> now thinks flags have changed. I tracked it down to changes in >> FlagChecker.hs, documented with >> https://ghc.haskell.org/trac/ghc/ticket/11798 and >> https://ghc.haskell.org/trac/ghc/ticket/10923, which add -fhpc and -O >> to the tracked flags. -fhpc means loading tests in ghci can never >> work, because ghci rejects the -fhpc flag, and likewise -O means ghci >> can never load optimized files for the same reason. >> >> It seems like the easiest solution might be to just have ghci not >> reject -fhpc and -O. Of course we could also revert those changes, >> but they're justified in the trac tickets. >> >> Of course this means I'm loading optimized code together with bytecode >> compiled code and maybe that's a bad thing (or for tests, -fhpc with >> non-hpc). But I've been doing this for something like 7 years and >> it's been fine. >> >> >> Unrelatedly, I was hoping compiles would get faster, but they seem a >> bit slower, from around 3m20s to around 4m :( I can track down >> per-file timing changes if it would be interesting to someone. >> >> Also thanks to whoever put trac tickets in the comments, it makes it >> really easy to find out why a change was made. >> _______________________________________________ >> Glasgow-haskell-users mailing list >> Glasgow-haskell-users@haskell.org >> http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users
