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69 lines
3.3 KiB
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.. _ContributingToLibcxx:
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======================
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Contributing to libc++
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======================
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This file contains notes about various tasks and processes specific to contributing
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to libc++. If this is your first time contributing, please also read `this document
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<https://www.llvm.org/docs/Contributing.html>`__ on general rules for contributing to LLVM.
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For libc++, please make sure you follow `these instructions <https://www.llvm.org/docs/Phabricator.html#requesting-a-review-via-the-command-line>`_
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for submitting a code review from the command-line using ``arc``, since we have some
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automation (e.g. CI) that depends on the review being submitted that way.
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Looking for pre-existing reviews
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================================
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Before you start working on any feature, please take a look at the open reviews
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to avoid duplicating someone else's work. You can do that by going to the website
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where code reviews are held, `Differential <https://reviews.llvm.org/differential>`__,
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and clicking on ``Libc++ Open Reviews`` in the sidebar to the left. If you see
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that your feature is already being worked on, please consider chiming in instead
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of duplicating work!
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Pre-commit check list
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=====================
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Before committing or creating a review, please go through this check-list to make
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sure you don't forget anything:
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- Do you have tests for every public class and/or function you're adding or modifying?
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- Did you update the synopsis of the relevant headers?
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- Did you update the relevant files to track implementation status (in ``docs/Status/``)?
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- Did you mark all functions and type declarations with the :ref:`proper visibility macro <visibility-macros>`?
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- If you added a header:
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- Did you add it to ``include/module.modulemap``?
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- Did you add it to ``include/CMakeLists.txt``?
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- If it's a public header, did you add a test under ``test/libcxx`` that the new header defines ``_LIBCPP_VERSION``? See ``test/libcxx/algorithms/version.pass.cpp`` for an example. NOTE: This should be automated.
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- If it's a public header, did you update ``utils/generate_header_inclusion_tests.py``?
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- Did you add the relevant feature test macro(s) for your feature? Did you update the ``generate_feature_test_macro_components.py`` script with it?
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- Did you run the ``libcxx-generate-files`` target and verify its output?
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Post-release check list
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=======================
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After branching for an LLVM release:
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1. Update ``_LIBCPP_VERSION`` in ``include/__config``
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2. Update the ``include/__libcpp_version`` file
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3. Update the version number in ``docs/conf.py``
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Exporting new symbols from the library
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======================================
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When exporting new symbols from libc++, you must update the ABI lists located in ``lib/abi``.
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To test whether the lists are up-to-date, please run the target ``check-cxx-abilist``.
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To regenerate the lists, use the target ``generate-cxx-abilist``.
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The ABI lists must be updated for all supported platforms; currently Linux and
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Apple. If you don't have access to one of these platforms, you can download an
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updated list from the failed build at
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`Buildkite <https://buildkite.com/llvm-project/libcxx-ci>`__.
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Look for the failed build and select the ``artifacts`` tab. There, download the
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abilist for the platform, e.g.:
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* C++20 for the Linux platform.
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* MacOS C++20 for the Apple platform.
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