I've come up with a model which I think will work for at least basic
Swift/Objective-C interoperation within a target. It isn't wonderful, but
it does at least seem feasible, and will probably not require too many
changes to Clang.
Swift SVN r9737
Also, update for the plan of record that the compiler driver will be
responsible for dependency analysis rather than an external build system.
Swift SVN r9573
This doc will contain the underlying build model for a multi-file Swift
framework or application module. This model will then be driven by
Xcode to build a target.
The biggest open questions are in how Swift and Objective-C will interact.
<rdar://problem/14579792> TLF: Swift 1.0 Modules
Swift SVN r9244