Cabal woes

Mon Apr 15 22:47:56 UTC 2019

But it fails this way instead, because 3.x works differently. Probably
should have checked docs given it's a new major version of cabal-install.

On Mon, Apr 15, 2019 at 6:44 PM Simon Peyton Jones <simonpj at microsoft.com>
wrote:

> Simon has a cabal-install that claims to be 3.0.0.0
>
>
> Ah yes, I installed it thus:
>
> ·        sudo add-apt-repository ppa:hvr/ghc-wsl
>
> ·        sudo apt-get update
>
> ·        sudo apt install cabal-install-3.0
>
>
>
> Why did I do that?  Because earlier versions of cabal crashed with a
> mysterious “The futex facility returned an unexpected” something like this
> https://github.com/Microsoft/WSL/issues/3881 or this
> https://github.com/reflex-frp/reflex-platform/issues/293
>
>
>
> Apparently Herbert’s 3.0 does not fail in this way.
>
>
>
> Simon
>
>
>
> *From:* ghc-devs <ghc-devs-bounces at haskell.org> *On Behalf Of *Brandon
> Allbery
> *Sent:* 15 April 2019 23:24
> *To:* Oleg Grenrus <oleg.grenrus at iki.fi>
> *Cc:* ghc-devs at haskell.org Devs <ghc-devs at haskell.org>
> *Subject:* Re: Cabal woes
>
>
>
> The facts here are in the original message: Simon has a cabal-install that
> claims to be 3.0.0.0, and is treating "install" as "v2-install". So
> evidently *someone* has released it in some fashion, perhaps
> inappropriately.
>
>
>
> On Mon, Apr 15, 2019 at 6:22 PM Oleg Grenrus <oleg.grenrus at iki.fi> wrote:
>
> cabal-install-3 isn't released. Please check the facts.
>
> - Oleg
>
> On 16.4.2019 1.17, Brandon Allbery wrote:
>
> 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%7C2fdeabc1bf0049584e9708d6c1f11cb5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909638652533306&sdata=pJb05mqT1A0ceYxJ26%2FkMhJCYQ9S7%2Bupn89xZSl7y2I%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%7C2fdeabc1bf0049584e9708d6c1f11cb5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909638652533306&sdata=mBDZQXgEtvQLuiTCFCKLtREPmImnr3ljNTHq%2B4A4Nf4%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%7C2fdeabc1bf0049584e9708d6c1f11cb5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909638652533306&sdata=scKnLWjyw1X5N1VPpBukOq4PXDoeHcYTXa3gT5bKK7E%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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> --
>
> brandon s allbery kf8nh
>
> allbery.b at gmail.com
>

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