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This new flag makes it easy to build Swift cross-compilation toolchains, by disabling cross-compilation of all host tools, like the Swift compiler and various macros, building on prior pulls #38441 and #82163. Also, add two class methods to the Testing macros product so it works with #83260.
swift_build_support
swift_build_support is a Python module containing functions and data
structures used by the Swift build script.
You may run unit tests for swift_build_support from the command line:
$ python3 utils/swift_build_support/run_tests.py