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.. _module-pw_third_party_re2:
===
RE2
===
The ``$dir_pw_third_party/re2/`` module provides build files to allow
optionally including upstream RE2.
.. _module-pw_third_party_re2-using_upstream:
------------------
Using upstream RE2
------------------
If you want to use RE2, you must do the following:
Submodule
=========
Add RE2 to your workspace with the following command.
.. code-block:: sh
git submodule add https://github.com/google/re2.git \
third_party/re2/src
GN
==
* Set the GN var ``dir_pw_third_party_re2`` to the location of the
RE2 source.
If you used the command above, this will be
``//third_party/re2/src``
This can be set in your args.gn or .gn file like:
``dir_pw_third_party_re2 = "//third_party/re2/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/re2/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/re2/src
Version
=======
The update script was last run for revision `c9cba76`_.
.. _c9cba76: https://github.com/google/re2/tree/c9cba76063cf4235c1a15dd14a24a4ef8d623761
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