1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
.. _ContributingToLibcxx:
======================
Contributing to libc++
======================
This file contains notes about various tasks and processes specific to contributing
to libc++. If this is your first time contributing, please also read `this document
<https://www.llvm.org/docs/Contributing.html>`__ on general rules for contributing to LLVM.
For libc++, please make sure you follow `these instructions <https://www.llvm.org/docs/Phabricator.html#requesting-a-review-via-the-command-line>`_
for submitting a code review from the command-line using ``arc``, since we have some
automation (e.g. CI) that depends on the review being submitted that way.
Looking for pre-existing reviews
================================
Before you start working on any feature, please take a look at the open reviews
to avoid duplicating someone else's work. You can do that by going to the website
where code reviews are held, `Differential <https://reviews.llvm.org/differential>`__,
and clicking on ``Libc++ Open Reviews`` in the sidebar to the left. If you see
that your feature is already being worked on, please consider chiming in instead
of duplicating work!
Pre-commit check list
=====================
Before committing or creating a review, please go through this check-list to make
sure you don't forget anything:
- Do you have tests for every public class and/or function you're adding or modifying?
- Did you update the synopsis of the relevant headers?
- Did you update the relevant files to track implementation status (in ``docs/Status/``)?
- Did you mark all functions and type declarations with the :ref:`proper visibility macro <visibility-macros>`?
- If you added a header:
- Did you add it to ``include/module.modulemap``?
- Did you add it to ``include/CMakeLists.txt``?
- 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.
- If it's a public header, did you update ``utils/generate_header_inclusion_tests.py``?
- 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?
- Did you run the ``libcxx-generate-files`` target and verify its output?
Post-release check list
=======================
After branching for an LLVM release:
1. Update ``_LIBCPP_VERSION`` in ``include/__config``
2. Update the ``include/__libcpp_version`` file
3. Update the version number in ``docs/conf.py``
Exporting new symbols from the library
======================================
When exporting new symbols from libc++, you must update the ABI lists located in ``lib/abi``.
To test whether the lists are up-to-date, please run the target ``check-cxx-abilist``.
To regenerate the lists, use the target ``generate-cxx-abilist``.
The ABI lists must be updated for all supported platforms; currently Linux and
Apple. If you don't have access to one of these platforms, you can download an
updated list from the failed build at
`Buildkite <https://buildkite.com/llvm-project/libcxx-ci>`__.
Look for the failed build and select the ``artifacts`` tab. There, download the
abilist for the platform, e.g.:
* C++20 for the Linux platform.
* MacOS C++20 for the Apple platform.
|
