On Thu, 16 Jun 2022, Erdi, Gergo via ghc-devs wrote:
Is there a migration guide for GHC API clients for the new “multiple home units” feature?
OK so in concrete terms, please see my attached program which is a heavily cut-down, standalone version of my real program. On commit fd42ab5fa1df847a6b595dfe4b63d9c7eecbf400^ (i.e. 3219610e3ba6cb6a5cd1f4e32e2b4befea5bd384) it compiles and works as expected. On commit fd42ab5fa1df847a6b595dfe4b63d9c7eecbf400 onwards, two problems pop up: 1. `extendMG` has changed and now requires manually specifying outgoing dependency edges. I thought the whole point of `summariseFile` was to collect this information? The reason I need to `extendMG` at that point is to get intra-unit orphan instances working. 2. `modifyUnitState` and its two uses (`addUnit` and `registerModule`) need to be updated to the new API. I think it makes sense that these need changing, since they touch exactly on the issue of which units are being compiled right now. However, I don't know how to update these. Also, I guess `setHomeUnit` should change the `CurrentUnit` instead of the `HomeUnit` now? Thanks, Gergo