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This adds a feature to hdrgen to emit JSON summaries of header files for build system integration. For now the summaries have only the basic information about each header that is relevant for build and testing purposes: the standards and includes lists.
This directory also contains the Python sources for hdrgen, which is what generates the headers public libc headers. The definitions for these headers are in the ``include`` directory. The ``.h.def`` files are the bases and the ``.yaml`` files are the contents.