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This is the first step to implement time zone support in libc++. This adds the complete tzdb_list class and a minimal tzdb class. The tzdb class only contains the version, which is used by reload_tzdb. Next to these classes it contains documentation and build system support needed for time zone support. The code depends on the IANA Time Zone Database, which should be available on the platform used or provided by the libc++ vendors. The code is labeled as experimental since there will be ABI breaks during development; the tzdb class needs to have the standard headers. Implements parts of: - P0355 Extending <chrono> to Calendars and Time Zones Addresses: - LWG3319 Properly reference specification of IANA time zone database Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D154282
libc++ Documentation ==================== The libc++ documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc++ with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBCXX_INCLUDE_DOCS=ON After configuring libc++ with these options the make rule `docs-libcxx-html` should be available. The documentation in this directory is published at https://libcxx.llvm.org. It is kept up-to-date by a build bot: https://lab.llvm.org/buildbot/#/builders/publish-sphinx-docs. If you notice that the documentation is not updating anymore, please contact one of the maintainers.