Hi George, Have you looked at the ticket I gave you? Here's one linked from it mentioning the topic of ghc-pkg compatibility with v2-install: https://github.com/haskell/cabal/issues/6508
I'm afraid we don't have any systematic exposition of cabal history with rationale for its major changes, but there's a changelog and the commit log. If you'd like to contribute something better, please do. Why the difference between GHC versions, I don't know, or whether upgrading your cabal would help (I doubt it). Regarding your workflow, perhaps ask around or look up in cabal tickets how other people do this now? I never run ghc directly, so I don't know. Best, Mikolaj On Sat, Oct 30, 2021 at 9:44 PM Brandon Allbery <allber...@gmail.com> wrote: > > Wasn't there specifically a new cabal version released to deal with > 9.2.1? 3.4.1.0 / 3.6.2.0? > > On Sat, Oct 30, 2021 at 3:24 PM George Colpitts > <george.colpi...@gmail.com> wrote: > > > > Thanks for the quick response Mikolaj. Sorry for the confusion, with cabal > > install I did use --lib but accidentally omitted that in my original email. > > In 9.0.1 this results in a successful compilation but in 9.2.1 it does not > > thus I believe this is a regression. > > > > Here's the output I got in 9.2.1: > > > > bash-3.2$ cabal install vector --lib > > Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports > > 'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1 > > Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports > > 'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1 > > Resolving dependencies... > > Up to date > > bash-3.2$ ghc buggc.hs > > [1 of 1] Compiling Main ( buggc.hs, buggc.o ) > > > > > > buggc.hs:2:1: error: > > Could not find module ‘Data.Vector’ > > Perhaps you meant Data.Functor (from base-4.16.0.0) > > Use -v (or `:set -v` in ghci) to see a list of the files searched for. > > | > > 2 | import Data.Vector > > > > > > However I did figure out a workaround: cabal v1-install. > > > > As far as I can tell cabal (v2-) install breaks ghc-pkg and compilation. > > With cabal (v2-) install the workaround for ghc-pkg is to add the option > > "-f $HOME/.cabal/store/ghc-9.2.1/package.db" to the end of the command > > "ghc-pkg list". For compilation the workaround is to add "-package-db > > $HOME/.cabal/store/ghc-9.2.1/package.db" to the ghc-pkg. I don't understand > > why it was necessary for cabal v2-install to be incompatible with cabal > > v1-install. Is there a link to any documentation and justification for > > these incompatible changes? > > > > Thanks again, > > George > > > > > > > > On Sat, Oct 30, 2021 at 3:38 PM Mikolaj Konarski <miko...@well-typed.com> > > wrote: > >> > >> Hi George, > >> > >> Since many versions of cabal, `install` only installs executables, not > >> libraries, so if that worked for you, you must have had an old version > >> of cabal. > >> > >> Please see https://github.com/haskell/cabal/issues/6481 for some > >> context and to help you find a new workflow that works for you > >> (ideally, a standard one). > >> > >> Kind regards, > >> Mikolaj > >> > >> On Sat, Oct 30, 2021 at 5:40 PM George Colpitts > >> <george.colpi...@gmail.com> wrote: > >> > > >> > Thanks Ben! > >> > > >> > There seems to be a regression in ghc / cabal integration in 9.2.1. > >> > > >> > In 9.2.1 if I do > >> > > >> > cabal install vector > >> > > >> > Compilation of a file containing > >> > > >> > > >> > import Data.Vector > >> > > >> > > >> > main = undefined > >> > > >> > > >> > fails with > >> > > >> > Could not find module ‘Data.Vector’ > >> > Perhaps you meant Data.Functor (from base-4.16.0.0) > >> > Use -v (or `:set -v` in ghci) to see a list of the files searched > >> > for. > >> > | > >> > 2 | import Data.Vector > >> > | ^^^^^^^^^^^^^^^^^^ > >> > > >> > The preceding works on ghc 9.0.1 > >> > > >> > Should I file a bug against Cabal? > >> > > >> > Thanks > >> > George > >> > > >> > On Fri, Oct 29, 2021 at 12:54 PM Ben Gamari <b...@well-typed.com> wrote: > >> >> > >> >> Hi all, > >> >> > >> >> The GHC developers are very happy to at long last announce the > >> >> availability of GHC 9.2.1. Binary distributions, source distributions, > >> >> and documentation are available at > >> >> > >> >> https://downloads.haskell.org/ghc/9.2.1 > >> >> > >> >> GHC 9.2 brings a number of exciting features including: > >> >> > >> >> * A native code generation backend for AArch64, significantly speeding > >> >> compilation time on ARM platforms like the Apple M1. > >> >> > >> >> * Many changes in the area of records, including the new > >> >> `RecordDotSyntax` and `NoFieldSelectors` language extensions, as well > >> >> as Support for `DuplicateRecordFields` with `PatternSynonyms`. > >> >> > >> >> * Introduction of the new `GHC2021` language extension set, giving > >> >> users convenient access to a larger set of language extensions which > >> >> have been long considered stable. > >> >> > >> >> * Merging of `ghc-exactprint` into the GHC tree, providing > >> >> infrastructure for source-to-source program rewriting out-of-the-box. > >> >> > >> >> * Introduction of a `BoxedRep` `RuntimeRep`, allowing for polymorphism > >> >> over levity of boxed objects (#17526) > >> >> > >> >> * Implementation of the `UnliftedDataTypes` extension, allowing users > >> >> to define types which do not admit lazy evaluation ([proposal]) > >> >> > >> >> * The new [`-hi` profiling] mechanism which provides significantly > >> >> improved insight into thunk leaks. > >> >> > >> >> * Support for the `ghc-debug` out-of-process heap inspection library > >> >> [ghc-debug] > >> >> > >> >> * Significant improvements in the bytecode interpreter, allowing more > >> >> programs to be efficently run in GHCi and Template Haskell splices. > >> >> > >> >> * Support for profiling of pinned objects with the cost-centre profiler > >> >> (#7275) > >> >> > >> >> * Faster compilation and a smaller memory footprint > >> >> > >> >> * Introduction of Haddock documentation support in TemplateHaskell > >> >> (#5467) > >> >> > >> >> Finally, thank you to Microsoft Research, GitHub, IOHK, the Zw3rk stake > >> >> pool, Tweag I/O, Serokell, Equinix, SimSpace, and other anonymous > >> >> contributors whose on-going financial and in-kind support has > >> >> facilitated GHC maintenance and release management over the years. > >> >> Moreover, this release would not have been possible without the hundreds > >> >> of open-source contributors whose work comprise this release. > >> >> > >> >> As always, do open a [ticket] if you see anything amiss. > >> >> > >> >> Happy testing, > >> >> > >> >> - Ben > >> >> > >> >> > >> >> [apple-m1]: > >> >> https://www.haskell.org/ghc/blog/20210309-apple-m1-story.html > >> >> [proposal]: > >> >> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0265-unlifted-datatypes.rst > >> >> [-hi profiling]: > >> >> https://well-typed.com/blog/2021/01/first-look-at-hi-profiling-mode/ > >> >> [ghc-debug]: http://ghc.gitlab.haskell.org/ghc-debug/ > >> >> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new > >> >> _______________________________________________ > >> >> ghc-devs mailing list > >> >> ghc-d...@haskell.org > >> >> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > >> > > >> > _______________________________________________ > >> > ghc-devs mailing list > >> > ghc-d...@haskell.org > >> > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > > > _______________________________________________ > > ghc-devs mailing list > > ghc-d...@haskell.org > > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > > > -- > brandon s allbery kf8nh > allber...@gmail.com _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users
