Cabal woes

Mon Apr 15 22:17:29 UTC 2019

I vaguely recall seeing that bug come up with respect to v2-install. And in
fact am a bit surprised that 3 has been released, since this is
highlighting that neither it nor the Haskell ecosystem is quite ready for
it.

I'd also have expected (and thought I'd seen) "cabal install" in recent 2.x
warn that it would be "v1-install" in the future.

On Mon, Apr 15, 2019 at 6:13 PM Simon Peyton Jones <simonpj at microsoft.com>
wrote:

> Aha!  That works.  I would never in a million years have found that by
> myself.  Thank you.
>
>
>
> But
>
>    - It is terribly mysterious that “cabal install hspec” doesn’t, well,
>    install hspec.
>    - It must surely be a bug that “cabal install –lib hspec” simply
>    crashes.
>
>
>
> Simon
>
>
>
> *From:* Brandon Allbery <allbery.b at gmail.com>
> *Sent:* 15 April 2019 23:03
> *To:* Simon Peyton Jones <simonpj at microsoft.com>
> *Cc:* ghc-devs at haskell.org
> *Subject:* Re: Cabal woes
>
>
>
> Yes, I think a lot of documentation will need to be updated because this.
> You want "cabal v1-install" with cabal 3.
>
>
>
> On Mon, Apr 15, 2019 at 6:00 PM Simon Peyton Jones <simonpj at microsoft.com>
> wrote:
>
> Thanks.  But alas I have no clue about whether I want a v1-install or a
> v2-install, nor how to achieve them if I knew what they were.  I just want
> to install ‘hspec’ so that I can use it when compiling a program.  How
> would I do that?
>
>
>
> The instructions here https://wiki.haskell.org/Cabal-Install
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.haskell.org%2FCabal-Install&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657350786&sdata=81SaQYxWkpF9nYalL%2B%2FSCbcGMMkYsMnFnpylDncDXu0%3D&reserved=0>
> just say “cabal install hspec” which is what I tried.  Those instructions
> are pointed to from here
> https://wiki.haskell.org/Cabal/How_to_install_a_Cabal_package
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.haskell.org%2FCabal%2FHow_to_install_a_Cabal_package&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657350786&sdata=ougOkZ0Dd%2Fep%2FshvVChLiGb9MEhEOW1sYxGnK8KJ8ww%3D&reserved=0>,
> which in turn are pointed to from the main Cabal home page
> https://www.haskell.org/cabal/
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.haskell.org%2Fcabal%2F&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657360794&sdata=I1SnV%2F4c2d05K39NLK%2FQ%2BLdfRoGRRCcKIGXHkNKMGH8%3D&reserved=0>
> .
>
>
>
> I must be missing something.
>
>
>
> Simon
>
>
>
> *From:* Brandon Allbery <allbery.b at gmail.com>
> *Sent:* 15 April 2019 22:54
> *To:* Simon Peyton Jones <simonpj at microsoft.com>
> *Cc:* ghc-devs at haskell.org
> *Subject:* Re: Cabal woes
>
>
>
> I think you wanted v1-install to install a library into the user package
> database, since your cabal is 3.x and the v2-* commands are now the default
> (that is, you did what used to be cabal new-install or cabal v2-install).
>
>
>
> On Mon, Apr 15, 2019 at 5:47 PM Simon Peyton Jones via ghc-devs <
> ghc-devs at haskell.org> wrote:
>
> I’m trying to install ‘hspec’ on my WSL (Windows subsystem for Linux)
> system.
>
> But I fail; see below.
>
> For some reason cabal complains about installing a library.  (That seems
> peculiar – isn’t that what cabal is for?)  But it helpfully suggests adding
> –lib.
>
> Alas, cabal then crashes outright, which should never happen.
>
> So I’m stuck.  What should I do?
>
> Thanks
>
> Simon
>
>
>
> simonpj at MSRC-9870733:~$ cabal --version
>
> cabal-install version 3.0.0.0
>
> compiled using version 3.0.0.0 of the Cabal library
>
> simonpj at MSRC-9870733:~$ cabal install hspec
>
> Resolving dependencies...
>
> Up to date
>
> Warning: You asked to install executables, but there are no executables in
>
> target: hspec. Perhaps you want to use --lib to install libraries instead.
>
> simonpj at MSRC-9870733:~$ cabal install --lib hspec
>
> Resolving dependencies...
>
> Up to date
>
> Distribution/Simple/GHC.hs:1959:5-56: Irrefutable pattern failed for
> pattern Just ghcPkgProg
>
>
>
> simonpj at MSRC-9870733:~$ which ghc
>
> /opt/ghc/bin/ghc
>
> simonpj at MSRC-9870733:~$ which ghc-pkg
>
> /opt/ghc/bin/ghc-pkg
>
> simonpj at MSRC-9870733:~$
>
>
>
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>
>
>
>
> --
>
> brandon s allbery kf8nh
>
> allbery.b at gmail.com
>
>
>
>
> --
>
> brandon s allbery kf8nh
>
> allbery.b at gmail.com
>

-- 
brandon s allbery kf8nh
allbery.b at gmail.com
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