swift

e7716605 - [build-script] Support building "early" SwiftSyntax via `--early-swiftsyntax`

[build-script] Support building "early" SwiftSyntax via `--early-swiftsyntax` Similar to the way the early Swift Driver is built, introduce a build-script option `--early-swiftsyntax` that uses the host Swift and CMake to build the parts of the swift-syntax package that are expected to become be used in the compiler. Note that this does not obviate the need for the `--swiftsyntax` option, because that build product uses the just-built Swift compiler and SwiftPM to build, test, and install everything from the swift-syntax package.