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-rw-r--r--docs/contributing/build/artifact_builds.rst173
-rw-r--r--docs/contributing/build/building_mobile_firefox.rst34
-rw-r--r--docs/contributing/build/supported.rst1
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diff --git a/docs/contributing/build/artifact_builds.rst b/docs/contributing/build/artifact_builds.rst
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+Understanding Artifact Builds
+=============================
+
+Firefox for Desktop and Android supports a **fast build mode** called
+*artifact mode*. The resulting builds are called *artifact builds*.
+Artifact mode downloads pre-built C++ components rather than building them
+locally, trading bandwidth for time.
+
+Artifact builds will be useful to many developers who are not working
+with compiled code (see "Restrictions" below). Artifacts are typically
+fetched from `mozilla-central <https://hg.mozilla.org/mozilla-central/>`__.
+
+To automatically download and use pre-built binary artifacts, add the
+following lines into your :ref:`mozconfig <Configuring Build Options>`
+file:
+
+.. code-block:: shell
+
+ # Automatically download and use compiled C++ components:
+ ac_add_options --enable-artifact-builds
+
+ # Write build artifacts to:
+ mk_add_options MOZ_OBJDIR=./objdir-frontend
+
+To automatically download and use the debug version of the pre-built
+binary artifact (currently supported for Linux, OSX and Windows
+artifacts), add ``ac_add_options --enable-debug`` to your mozconfig file
+(with artifact builds option already enabled):
+
+.. code-block:: shell
+
+ # Enable debug versions of the pre-built binary artifacts:
+ ac_add_options --enable-debug
+
+ # Automatically download and use compiled C++ components:
+ ac_add_options --enable-artifact-builds
+
+ # Download debug info so that stack traces refers to file and columns rather than library and Hex address
+ ac_add_options --enable-artifact-build-symbols
+
+ # Write build artifacts to:
+ mk_add_options MOZ_OBJDIR=./objdir-frontend-debug-artifact
+
+
+Prerequisites
+-------------
+
+Artifact builds are supported for users of Mercurial and Git. Git
+artifact builds require a mozilla-central clone made with the help of
+`git-cinnabar <https://github.com/glandium/git-cinnabar>`__. Please
+follow the instructions on the git-cinnabar project page to install
+git-cinnabar. Further information about using git-cinnabar to interact
+with Mozilla repositories can be found on `the project
+wiki <https://github.com/glandium/git-cinnabar/wiki/Mozilla:-A-git-workflow-for-Gecko-development>`__.
+
+Building
+--------
+
+If you've added ``--enable-artifact-builds`` to your ``mozconfig``, each
+time you run ``mach build`` and ``mach build path/to/subdirectory`` the
+build system will determine what the best pre-built binary artifacts
+available are, download them, and put them in place for you. The
+computations are cached, so the additional calculations should be very
+fast after the up-to-date artifacts are downloaded -- just a second or
+two on modern hardware. Most Desktop developers should find that
+
+.. code-block:: shell
+
+ ./mach build
+ ./mach run
+
+just works.
+
+To only rebuild local changes (to avoid re-checking for pushes and/or
+unzipping the downloaded cached artifacts after local commits), you can
+use:
+
+.. code-block:: shell
+
+ ./mach build faster
+
+which only "builds" local JS, CSS and packaged (e.g. images and other
+asset) files.
+
+Most Firefox for Android developers should find that
+
+.. code-block:: shell
+
+ ./mach build
+ ./mach package
+ ./mach install
+
+just works.
+
+Pulling artifacts from a try build
+----------------------------------
+
+To only accept artifacts from a specific revision (such as a try build),
+set ``MOZ_ARTIFACT_REVISION`` in your environment to the value of the
+revision that is at the head of the desired push. Note that this will
+override the default behavior of finding a recent candidate build with
+the required artifacts, and will cause builds to fail if the specified
+revision does not contain the required artifacts.
+
+Restrictions
+------------
+
+Oh, so many. Artifact builds are rather delicate: any mismatch between
+your local source directory and the downloaded binary artifacts can
+result in difficult to diagnose incompatibilities, including unexplained
+crashes and catastrophic XPCOM initialization and registration
+failures. These are rare, but do happen.
+
+Things that are supported
+-------------------------
+
+- Modifying JavaScript, (X)HTML, and CSS resources; and string
+ properties and FTL files.
+- Modifying Android Java code, resources, and strings.
+- Running mochitests and xpcshell tests.
+- Modifying ``Scalars.yaml`` to add Scalar Telemetry (since {{
+ Bug("1425909") }}, except artifact builds on try).
+- Modifying ``Events.yaml`` to add Event Telemetry (since {{
+ Bug("1448945") }}, except artifact builds on try).
+
+Essentially everything updated by ``mach build faster`` should work with
+artifact builds.
+
+Things that are not supported
+-----------------------------
+
+- Support for products other than Firefox for Desktop and
+ Android are not supported and are unlikely to ever be supported.
+ Other projects like Thunderbird may provide
+ `their own support <https://developer.thunderbird.net/thunderbird-development/building-thunderbird/artifact-builds>`__
+ for artifact builds.
+- You cannot modify C, C++, or Rust source code anywhere in the tree.
+ If it’s compiled to machine code, it can't be changed.
+- You cannot modify ``histograms.json`` to add Telemetry histogram
+ definitions.(But see `Bug 1206117 <https://bugzilla.mozilla.org/show_bug.cgi?id=1206117>`__).
+- Modifying build system configuration and definitions does not work in
+ all situations.
+
+Things that are not **yet** supported
+-------------------------------------
+
+- Tests other than mochitests, xpcshell, and Marionette-based tests.
+ There aren’t inherent barriers here, but these are not known to work.
+- Modifying WebIDL definitions, even ones implemented in JavaScript.
+
+Troubleshooting
+---------------
+
+There are two parts to artifact mode:
+the ``--disable-compile-environment`` option, and the ``mach artifact``
+command that implements the downloading and caching. Start by running
+
+.. code-block:: shell
+
+ ./mach artifact install --verbose
+
+to see what the build system is trying to do. There is some support for
+querying and printing the cache; run ``mach artifact`` to see
+information about those commands.
+
+Downloaded artifacts are stored in
+``$MOZBUILD_STATE_PATH/package-frontend``, which is almost always
+``~/.mozbuild/package-frontend``.
+
+Discussion is best started on the `dev-builds mailing
+list <https://lists.mozilla.org/listinfo/dev-builds>`__. Questions are
+best raised in `#build <https://chat.mozilla.org/#/room/#build:mozilla.org>`__ on `Matrix <https://chat.mozilla.org/>`__. Please
+file bugs in *Firefox Build System :: General*, blocking `Bug 901840 <https://bugzilla.mozilla.org/show_bug.cgi?id=901840>`__
diff --git a/docs/contributing/build/building_mobile_firefox.rst b/docs/contributing/build/building_mobile_firefox.rst
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+Firefox for Mobile Devices
+--------------------------
+
+We have several different mobile products aimed at different tasks,
+devices, and audiences:
+
+- Building **Firefox for Android** (codename: fenix). Our general-purpose
+ mobile browser is split into several different artifact layers:
+
+ - `The fenix Android application </mobile/android/fenix.html>`_
+ - `The android-components Android library <https://github.com/mozilla-mobile/firefox-android/tree/main/android-components>`_
+ - `The GeckoView platform </mobile/android/geckoview>`_
+
+- `Firefox for iOS <https://github.com/mozilla-mobile/firefox-ios>`_,
+ our general-purpose browser for iOS with desktop sync built-in.
+- Building **Firefox Focus**, our privacy-focused browser for
+
+ - `iOS <https://github.com/mozilla-mobile/focus-ios>`_
+ - `Android <https://github.com/mozilla-mobile/firefox-android/tree/main/focus-android>`_. This browser
+ also uses the android-components library and GeckoView platform, like Firefox for Android
+
+For both Desktop and Mobile development, please bear the following in
+mind:
+
+- While you can build Firefox on older hardware it can take quite a bit
+ of time to compile on slower machines. Having at least 8GB of RAM is
+ recommended, and more is always better. The build process is both CPU
+ and I/O intensive, so building on a machine with an SSD is also
+ strongly preferred.
+- Fast broadband internet is strongly recommended as well. Both the
+ development environment and the source code repository are quite
+ large.
+- Though you can build Firefox to run on 32-bit machines, the build
+ process for almost all of our products requires a 64-bit OS.
diff --git a/docs/contributing/build/supported.rst b/docs/contributing/build/supported.rst
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+.. include:: ../../build/buildsystem/supported-configurations.rst