Jacquin Mininger 7d67db3919 shellFor: Refactor for consistency and cross ... This makes it work like work-on-multi from Reflex Platform. In particular, rather than making `.env` from `shellFor`, we make `.env` the primitive, and `shellFor` works by combining together the arguments of all the packages to `generic-builder` and taking the `.env` of the resulting mashup-package. There are 2 benefits of this: 1. The dependency logic is deduplicated. generic builder just concatted lists, whereas all the envs until now would sieve apart haskell and system build inputs. Now, they both decide haskell vs system the same way: according to the argument list and without reflection. Consistency is good, especially because it mean that if the build works, the shell is more likely to work. 2. Cross is handled better. For native builds, because the `ghcWithPackages` calls would shadow, we through both the regular component (lib, exe, test, bench) haskell deps and Setup.hs haskell deps in the same `ghcWithPackages` call. But for cross builds we use `buildPackages.ghcWithPackages` to get the setup deps. This ensures everything works correctly.		2020-01-17 10:46:29 -05:00
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