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Passes the value of the environment variable `TOOLCHAIN_VERSION` through
to Swift's `SWIFT_TOOLCHAIN_VERSION` for use in eg.
`-print-target-info` (and some day, `--version`).
(cherry picked from commit 3982ebbbb3)
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