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

David Banas capn.freako at gmail.com
Thu Sep 3 14:17:14 UTC 2015

Hmm…is it possible that the packages entries in my stack.yaml file:

flags: {}
- '.'
- circat/
- hermit/
- hermit/examples/HIW13/second/plugin/
- hermit/optimizations/pretty/hermit-pretty/
- hermit-extras/
- kure/
- lambda-ccc/
- netlist/netlist/
- netlist/netlist-to-verilog/
- netlist/netlist-to-vhdl/
- netlist/verilog/
- applicative-numbers-0.1.3
- marked-pretty-0.1
- ty-0.1.5
- type-unary-0.2.19
resolver: lts-2.22

are what guided stack down the right path, re: mimicking the effect of my “cabal sandbox —add-source …” commands?

And that the version constraints in the “lts-2.22” cabal.config just happened to be what I needed for this project?


On Sep 3, 2015, at 6:25 AM, Michael Snoyman <michael at snoyman.com> wrote:

> I'm glad it worked, but I don't think it's doing what you think it's doing. stack intentionally ignores cabal sandbox settings and the like so that the tools don't step on each others' toes. I'm not sure what --add-source you were using, but it's very unlikely that stack picked it up.
> I am now quite curious what the problem was and how stack ended up just working for this.
> On Thu, Sep 3, 2015 at 3:32 PM, David Banas <capn.freako at gmail.com> wrote:
> 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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