After implementing new installed package ID (hash of sdist), get rid of package keys
GHC tracking bug for https://github.com/haskell/cabal/issues/2745
Externally, GHC's flags do not have to change much; a user simply passes the installed package ID to the flag currently named -this-package-key (but perhaps we should rename this.)
Internally, if we can assume that PackageKey == InstalledPackageId, we can do away with the InstalledPackageId map and get rid of the level of indirection between the bin-pkg-db (which records installed package IDs`) and GHC's guts (which record package keys).
Blocked on Cabal not actually using ABI hashes to identify packages.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Package system |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |
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