October 2021 - cabal-devel

Re: regression in ghc / cabal integration in 9.2.1
by Mikolaj Konarski 30 Oct '21

30 Oct '21

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 <allbery.b(a)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.colpitts(a)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 <mikolaj(a)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.colpitts(a)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 <ben(a)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-u… > >> >> [-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-devs(a)haskell.org > >> >> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > >> > > >> > _______________________________________________ > >> > ghc-devs mailing list > >> > ghc-devs(a)haskell.org > >> > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > > > _______________________________________________ > > ghc-devs mailing list > > ghc-devs(a)haskell.org > > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > > > -- > brandon s allbery kf8nh > allbery.b(a)gmail.com

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Re: regression in ghc / cabal integration in 9.2.1
by Mikolaj Konarski 30 Oct '21

30 Oct '21

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.colpitts(a)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 <ben(a)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-u… >> [-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-devs(a)haskell.org >> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > _______________________________________________ > ghc-devs mailing list > ghc-devs(a)haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

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[ANN] Cabal-3.4.1.0, cabal-install-3.4.1.0, Cabal-3.6.2.0, and cabal-install-3.6.2.0
by Emily Pillmore 08 Oct '21

08 Oct '21

Hello Haskell, The Cabal team is excited to announce the release of `Cabal-3.6.2.0`, and `cabal-install-3.6.2.0`. ## Changelog for `Cabal-3.6.2.0` and `cabal-install-3.6.2.0` This is the fifth release of the 3.0 release series for both packages. This minor version release introduces a set of fixes for some regressions seen when the tool interacts with `autoconf`, as well as some fixes for regressions to the way Paths_ modules interact with non-standard preludes: - Making Paths_ modules work with non-standard preludes again [#5962]( https://github.com/haskell/cabal/issues/5962 ) - Generate Paths_ module with qualified Data.List.last import so that compatibility with non-standard preludes is not regressed compared to cabal 3.4. - Windows: redo the fix to breakage caused by new autoconf; the wrong fix made cabal sometimes fail with old autoconf [#7494]( https://github.com/haskell/cabal/issues/7494 ) [#7649]( https://github.com/haskell/cabal/issues/7649 ) - Reverts #7510 that failed on Windows when used with pre-generated scripts included in packages such as network, time, process. - Adds a subtler fix/workaround for the deficiencies of new autoconf versions on Windows. **IMPORTANT NOTE**: The last bug affects configuration files generated with `autoconf-2.70` or later. They will not work with `cabal-3.4.0.0`. Please either upgrade to `3.4.1.0` or the new `3.6.2.0` releases. I'd like to thank the many contributors who offered patches, tickets, and other help in the preparation of this release. We appreciate all of your help! Happy hacking!

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