Re: Cabal woes

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 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 *Sent:* 15 April 2019 23:03 *To:* Simon Peyton Jones *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 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 *Sent:* 15 April 2019 22:54 *To:* Simon Peyton Jones *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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--

brandon s allbery kf8nh

allbery.b@gmail.com

--

brandon s allbery kf8nh

allbery.b@gmail.com

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