[Haskell-cafe] How to direct cabal to use an alternative ghc version, ala stack?

[David Banas]

Thanks to all, whom replied.

I found that a simple “stack install …” worked perfectly, as an alternative to “cabal install ...". Stack seems to have honored all the “cabal …” things I did in setting up my sandbox, including all my “cabal sandbox —add-source …” commands (5 in all). And, of course, it used the back-rev’d version of ghc I configured it (i.e. - stack) for.

That is SO neat that I can’t understand why it’s not a featured item in the Stack documentation.
Thanks, Stack crew!

-db

On Sep 2, 2015, at 8:59 PM, Michael Snoyman <michael at snoyman.com> wrote:

> 
> 
> On Thu, Sep 3, 2015 at 3:37 AM, David Banas <capn.freako at gmail.com> wrote:
> Hi all,
> 
> How do I direct cabal to use an alternative (i.e. - not my system’s default) version of ghc, which I’ve installed, via stack?
> 
> I tried this:
> 
> stack exec cabal install ...
> 
> but got this:
> 
> cabal: Use of GHC's environment variable GHC_PACKAGE_PATH is incompatible with
> Cabal. Use the flag --package-db to specify a package database (it can be used
> multiple times).
> 
> Thanks,
> -db
> 
> 
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
> 
> 
> We have a flag to working better with cabal, you can try:
> 
>     stack exec --no-ghc-package-path -- cabal install
> 
> I'm under the impression that there are changes planned to cabal (possibly already implemented but not released) that will allow it to function nicely with the GHC_PACKAGE_PATH environment variable, but I'm uncertain if that's true.
> 
> Michael

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