_______________________________________________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@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@gmail.com>
Sent: 15 April 2019 23:03
To: Simon Peyton Jones <simonpj@microsoft.com>
Cc: ghc-devs@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@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 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, which in turn are pointed to from the main Cabal home page https://www.haskell.org/cabal/.
I must be missing something.
Simon
From: Brandon Allbery <allbery.b@gmail.com>
Sent: 15 April 2019 22:54
To: Simon Peyton Jones <simonpj@microsoft.com>
Cc: ghc-devs@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@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@MSRC-9870733:~$ cabal --version
cabal-install version 3.0.0.0
compiled using version 3.0.0.0 of the Cabal library
simonpj@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@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@MSRC-9870733:~$ which ghc
/opt/ghc/bin/ghc
simonpj@MSRC-9870733:~$ which ghc-pkg
/opt/ghc/bin/ghc-pkg
simonpj@MSRC-9870733:~$
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