mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-04 19:33:18 +00:00
55095c6e31
MozReview-Commit-ID: KDasHNTCKrq --HG-- extra : rebase_source : dfb7be3ff99ee1316c8fb19ca9d4456731f05e4a
74 lines
3.4 KiB
ReStructuredText
74 lines
3.4 KiB
ReStructuredText
.. _rust:
|
|
|
|
==============================
|
|
Including Rust Code in Firefox
|
|
==============================
|
|
|
|
The build system has support for building and linking Rust crates.
|
|
Rust code is built using ``cargo`` in the typical way, so it is
|
|
straightforward to take an existing Rust crate and integrate it
|
|
into Firefox.
|
|
|
|
Linking Rust Crates into libxul
|
|
===============================
|
|
|
|
Rust crates that you want to link into libxul should be listed in the
|
|
``dependencies`` section of `toolkit/library/rust/shared/Cargo.toml <https://dxr.mozilla.org/mozilla-central/source/toolkit/library/rust/shared/Cargo.toml>`_.
|
|
After adding your crate, execute ``cargo update -p gkrust-shared`` in
|
|
``toolkit/library/rust`` to update the Cargo.lock file. You'll also
|
|
need to add an ``extern crate`` reference to
|
|
`toolkit/library/rust/shared/lib.rs <https://dxr.mozilla.org/mozilla-central/source/toolkit/library/rust/shared/lib.rs>`_.
|
|
This ensures that the Rust code will be linked properly into libxul as well
|
|
as the copy of libxul used for gtests.
|
|
|
|
Linking Rust Crates into something else
|
|
=======================================
|
|
|
|
There currently is not any Rust code being linked into binaries other than
|
|
libxul. If you would like to do so, you'll need to create a directory with
|
|
a ``Cargo.toml`` file for your crate, and a ``moz.build`` file that contains:
|
|
|
|
.. code-block:: python
|
|
|
|
RustLibrary('crate_name')
|
|
|
|
Where *crate_name* matches the name from the ``[package]`` section of your
|
|
``Cargo.toml``. You can refer to `the moz.build file <https://dxr.mozilla.org/mozilla-central/rev/3f4c3a3cabaf94958834d3a8935adfb4a887942d/toolkit/library/rust/moz.build#7>`_ and `the Cargo.toml file <https://dxr.mozilla.org/mozilla-central/rev/3f4c3a3cabaf94958834d3a8935adfb4a887942d/toolkit/library/rust/Cargo.toml>`_ that are used for libxul.
|
|
|
|
You can then add ``USE_LIBS += ['crate_name']`` to the ``moz.build`` file
|
|
that defines the binary as you would with any other library in the tree.
|
|
|
|
.. important::
|
|
|
|
You cannot link a Rust crate into an intermediate library that will wind
|
|
up being linked into libxul. The build system enforces that only a single
|
|
``RustLibrary`` may be linked into a binary. If you need to do this, you
|
|
will have to add a ``RustLibrary`` to link to any standalone binaries that
|
|
link the intermediate library, and also add the Rust crate to the libxul
|
|
dependencies as in `linking Rust Crates into libxul`_.
|
|
|
|
Where Should I put my Crate?
|
|
============================
|
|
|
|
If your crate's canonical home is mozilla-central, you can put it next to the
|
|
other code in the module it belongs to.
|
|
|
|
If your crate is mirrored into mozilla-central from another repository, and
|
|
will not be actively developed in mozilla-central, you can simply list it
|
|
as a ``crates.io``-style dependency with a version number, and let it be
|
|
vendored into the ``third_party/rust`` directory.
|
|
|
|
If your crate is mirrored into mozilla-central from another repository, but
|
|
will be actively developed in both locations, you should send mail to the
|
|
dev-builds mailing list to start a discussion on how to meet your needs.
|
|
|
|
|
|
Crate dependencies
|
|
==================
|
|
|
|
All dependencies for in-tree Rust crates are vendored into the
|
|
``third_party/rust`` directory. Currently if you add a dependency on a new
|
|
crate you must run ``mach vendor rust`` to vendor the dependencies into
|
|
that directory. In the future we hope to make it so that you only need to
|
|
vendor the dependencies in order to build your changes in a CI push.
|