Override compiler version from a snapshot

[snoyberg]

Motivation: wanting to use a different point release, or test out a new GHC HEAD image. Perhaps the syntax could be:

resolver:
snapshot: lts-3.2
ghc: 7.10.3

Splitting off from #816

[phadej]

Isn't this possible by setting $PATH right, and using --skip-ghc-check?

[snoyberg]

Yes, but this would have the advantage that it would be explicit in the
config file, setup would work, and stack could prevent you from
accidentally using the wrong GHC.

On Sun, Aug 23, 2015, 8:21 PM Oleg Grenrus notifications@github.com wrote:

Isn't this possible by setting $PATH right, and using --skip-ghc-check?

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#836 (comment)
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[phadej]

👍

[phadej]

Should one consider also command line option? Example usage:

stack --resolver-ghc=7.10.3 --stack-yaml=stack-lts-3.yaml build --test

and similarly --resolver-snapshot (or just --snapshot?) ?

[snoyberg]

I'd rather not tbh. It's going to be complicated enough to figure out a
good syntax for the yaml, I doubt we'll come up with something good on the
command line.

On Sun, Aug 23, 2015, 8:40 PM Oleg Grenrus notifications@github.com wrote:

Should one consider also command line option? Example usage:

stack --resolver-ghc=7.10.3 --stack-yaml=stack-lts-3.yaml build --test

and similarly --resolver-snapshot (or just --snapshot?) ?

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#836 (comment)
.

[snoyberg]

Closed in favor of #863