Feature request: Entry point should contain information whether it has changed

[esseswann]

Currently if code changed in one of the entry points, all of them are being rebuilt or at least all of them are present in outputFiles. For our case it would be convenient to either provide only changed outputFiles or add a flag that describes whether it was changed since the last build

[evanw]

I'm thinking that providing the output file content hash (see #3293) would be a better way to do this. Providing only changed output files or providing a flag doesn't necessarily work for what you're trying to do because different builds can have different numbers of output files (i.e. sometimes an output file may be removed) and this information wouldn't be communicated in that case.

[esseswann]

@evanw thanks, this works