<div dir="ltr">How would I use stack with a GHC 8.0.2 release candidate?<br><div class="gmail_extra"><br><div class="gmail_quote">On 13 September 2016 at 21:27, Christopher Allen <span dir="ltr"><<a href="mailto:cma@bitemyapp.com" target="_blank">cma@bitemyapp.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Stack is not your shell, a build script, or a Makefile. It already has<br>
path management for the GHC installations it provisions and supports.<br>
It is not Stack's job to mutilate your path to support external GHC<br>
installations.<br>
<br>
Make a Makefile or add shortcuts to your bashrc to switch compilers.<br>
<div class="HOEnZb"><div class="h5"><br>
On Tue, Sep 13, 2016 at 3:16 PM, Paolo Giarrusso <<a href="mailto:p.giarrusso@gmail.com">p.giarrusso@gmail.com</a>> wrote:<br>
> On Tuesday, September 13, 2016 at 10:05:44 PM UTC+2, Christopher Allen<br>
> wrote:<br>
>><br>
>> Stack users are moving away from enabling system installed GHCs by<br>
>> default because it breaks the ease of enabling profiling for libraries<br>
>> when you're using a Stack-installed GHC.<br>
><br>
><br>
>><br>
>> I'm not sure why multiple system-installed GHCs needs to be supported<br>
>> in addition to the GHC support Stack already provides. That's extra<br>
>> work for...what? Stack isn't trying to compete with Nix. It's more<br>
>> like a blend of rustup and cargo -- or Clojure's Leiningen.<br>
><br>
><br>
> To clarify: I'm not proposing stack to install those GHCs, just to use them.<br>
><br>
> I think the extra work would be limited (calling GHC-X.Y.Z instead of GHC)<br>
> and has other technical advantages<br>
> (<a href="https://github.com/commercialhaskell/stack/issues/2433" rel="noreferrer" target="_blank">https://github.com/<wbr>commercialhaskell/stack/<wbr>issues/2433</a>). Mind you, I'm<br>
> willing to contribute the work and not asking anybody—I've just been busy.<br>
><br>
> Right now I have to modify the PATH every time I use GHC 7.8.4 because I<br>
> needed to customize the build (I'm on OS X 10.11), but I still want GHC 8 by<br>
> default.<br>
><br>
>><br>
>> On Tue, Sep 13, 2016 at 3:01 PM, Paolo Giarrusso <<a href="mailto:p.gia...@gmail.com">p.gia...@gmail.com</a>><br>
>> wrote:<br>
>> ><br>
>> ><br>
>> > On Tuesday, September 13, 2016 at 9:47:20 PM UTC+2, Richard Eisenberg<br>
>> > wrote:<br>
>> >><br>
>> >> Thanks, many, for explaining better ways to interact directly with GHC<br>
>> >> after using a `stack setup`. Perhaps, then, all that’s stopping someone<br>
>> >> like<br>
>> >> me from liking the ease of `stack setup` is a little missing PR (as in,<br>
>> >> public relations). I understand that many people want to keep GHC<br>
>> >> cloistered<br>
>> >> away to ease version swapping, but others (like me) want GHC available<br>
>> >> front<br>
>> >> and center.<br>
>> >><br>
>> >> Other minor points:<br>
>> >> `stack env` does not work for me: my version of stack does not know how<br>
>> >> to<br>
>> >> `env`.<br>
>> ><br>
>> ><br>
>> > That's correct—stack env was a feature request.<br>
>> ><br>
>> > The warning on `stack ghci` doesn't happen usually, but I'd say that's a<br>
>> > bug<br>
>> > (probably because it's a new install)?<br>
>> ><br>
>> > I use stack (and have contributed a bit recently), but I agree there's a<br>
>> > few<br>
>> > things stack could do better for this workflow.<br>
>> ><br>
>> > And the transition has a rather annoying learning curve—stack ghci and<br>
>> > stack<br>
>> > ghc are not the same as ghci/ghc. I think that's on purpose to support a<br>
>> > project-based workflow, and it has upsides, but it's a transition<br>
>> > pitfall.<br>
>> > Lots of things *are* explained in<br>
>> > <a href="https://docs.haskellstack.org/en/latest/faq/" rel="noreferrer" target="_blank">https://docs.haskellstack.org/<wbr>en/latest/faq/</a>, but you do need learn a<br>
>> > few<br>
>> > things from scratch.<br>
>> ><br>
>> > You want stack exec ghc and stack exec ghci, and arbitrary options<br>
>> > require a<br>
>> > double dash `--` — use `stack ghc -- --version` or `stack exec -- ghc<br>
>> > --version`. And I'm afraid the command syntax is mostly frozen by now.<br>
>> ><br>
>> > To support a compiler-based workflow, there are a few things planned—I<br>
>> > opened an issue to collect them, starting from Simon Marlow's recent<br>
>> > email:<br>
>> > <a href="https://github.com/commercialhaskell/stack/issues/2546" rel="noreferrer" target="_blank">https://github.com/<wbr>commercialhaskell/stack/<wbr>issues/2546</a><br>
>> ><br>
>> > BTW, a system-installed GHC already works if you stick to one (and only<br>
>> > build projects that need that). But I'd love to support multiple<br>
>> > system-installed GHCs and being able to pick the one you need.<br>
>> ><br>
>> > As others already explained, giving access to stack-installed GHCs can<br>
>> > be<br>
>> > problematic—they're going to work, in part, exactly because you can't<br>
>> > install in their package database.<br>
>> ><br>
>> > Having stack install system-wide GHCs would IMHO risk opening a can of<br>
>> > worms—having working binaries for all Linux distros requires some work,<br>
>> > system installers would be harder and most users would dislike them.<br>
>> ><br>
>> > ______________________________<wbr>_________________<br>
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>> > Only members subscribed via the mailman list are allowed to post.<br>
>><br>
>> --<br>
>> Chris Allen<br>
>> Currently working on <a href="http://haskellbook.com" rel="noreferrer" target="_blank">http://haskellbook.com</a><br>
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>> Haskell-Cafe mailing list<br>
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>> Only members subscribed via the mailman list are allowed to post.<br>
<br>
<br>
<br>
--<br>
Chris Allen<br>
Currently working on <a href="http://haskellbook.com" rel="noreferrer" target="_blank">http://haskellbook.com</a><br>
______________________________<wbr>_________________<br>
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