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If the directory where the build time log is supposed to go doesn't exist, create it. The append file mode will create files, but won't create directories. When we start building ninja, we haven't necessary created the build directory yet, so this results in an error about the missing directory when writing the build time log.
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