With interdependent targets, --only-configure fails, also affects ghci

[mgsloan]

Repro: Run stack build --only-configure on store.

Result:

mgsloan@computer:~/fpco/store$ stack build --only-configure
WARNING: /home/mgsloan/fpco/store/store.cabal was generated with a newer version of hpack, please upgrade and try again.
store-core-0.3: configure
store-0.3: configure
Completed 2 action(s).
singleBuild: invariant violated, missing package ID missing

What's happening here is that the configure step for store expects to have a package ID for store-core. However, since it didn't get built, there is none.

This is problematic for the internal build flag --initial-build-steps, used for the resolution of #1364 . This means that the initial build steps aren't run for the downstream packages. For this flag, the ideal resolution would be to do a full build for packages that have downstream packages which depend on them.

[mgsloan]

Fixed!