Hi Simon, I've tested with current master (commit 6f4a073) and the link time is back down. In fact the compile time seems fast in general, and an unrelated ld error which I hadn't yet tracked down has disappeared too.
Thanks for the quick patch! Conrad. On 16 February 2012 19:45, Simon Marlow <marlo...@gmail.com> wrote: > Will be fixed in 7.4.2: > > http://hackage.haskell.org/trac/ghc/ticket/5878 > > Cheers, > Simon > > > On 16/02/2012 05:10, Evan Laforge wrote: >> >> Thanks for bringing this up. I've been having the same problem and was >> thinking there was something wrong with my system. I have 3 main files >> and one util that they all import. Every build recompiles every file, >> even if there were no changes. >> >> On Feb 15, 2012 8:39 PM, "Conrad Parker" <con...@metadecks.org >> <mailto:con...@metadecks.org>> wrote: >> >> Hi, >> >> We have a project with around 200 Haskell source files, and around 20 >> executables which import these (as well as importing third-party >> libraries). We first build all the non-main files using a makefile >> generated with ghc -M. We then build the executables using a separate >> invocation of "ghc --make --main-is foo.hs", for each foo.hs. This >> worked fine with ghc-7.2.1; each final "ghc --make" would simply link >> the pre-built object files -- but with ghc-7.4.1 all these files are >> recompiled for each target executable. As a result our full build >> takes around 10-20x longer with ghc-7.4.1 than ghc-7.2.1. >> >> Looking at compiler/iface/FlagChecker.hs, it seems that the --main-is >> flag is used as an input to the recompilation checker. It would make >> sense that --main-is should force recompilation of the particular file >> that exports 'main', but it also forces recompilation of its >> dependencies. Is this a bug or is there a good reason to recompile >> everything? >> >> Conrad. >> >> _______________________________________________ >> Glasgow-haskell-users mailing list >> Glasgow-haskell-users@haskell.org >> <mailto:Glasgow-haskell-users@haskell.org> >> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users >> >> >> >> >> _______________________________________________ >> Glasgow-haskell-users mailing list >> Glasgow-haskell-users@haskell.org >> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > > _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
