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.. _module-pw_third_party_abseil_cpp:
==========
Abseil C++
==========
The ``$dir_pw_third_party/abseil-cpp/`` module provides build files to allow
optionally including upstream Abseil C++.
.. _module-pw_third_party_abseil_cpp-using_upstream:
-------------------------
Using upstream Abseil C++
-------------------------
If you want to use Abseil C++, you must do the following:
Submodule
=========
Add Abseil C++ to your workspace with the following command.
.. code-block:: sh
git submodule add https://github.com/abseil/abseil-cpp.git \
third_party/abseil-cpp/src
GN
==
* Set the GN var ``dir_pw_third_party_abseil-cpp`` to the location of the
Abseil C++ source.
If you used the command above, this will be
``//third_party/abseil-cpp/src``
This can be set in your args.gn or .gn file like:
``dir_pw_third_party_abseil_cpp = "//third_party/abseil-cpp/src"``
Updating
========
The GN build files are generated from the third-party Bazel build files using
$dir_pw_build/py/pw_build/generate_3p_gn.py.
The script uses data taken from ``$dir_pw_third_party/abseil-cpp/repo.json``.
The script should be re-run whenever the submodule is updated or the JSON file
is modified. Specify the location of the Bazel repository can be specified using
the ``-w`` option, e.g.
.. code-block:: sh
python pw_build/py/pw_build/generate_3p_gn.py \
-w third_party/abseil-cpp/src
Version
=======
The update script was last run for revision `67f9650`_.
.. _67f9650: https://github.com/abseil/abseil-cpp/tree/67f9650c93a4fa04728a5b754ae8297d2c55d898
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