.. _build_toolchains: =========================== Creating Toolchain Archives =========================== There are various scripts in the repository for producing archives of the build tools (e.g. compilers and linkers) required to build. Clang and Rust ============== To modify the toolchains used for a particular task, you may need several things: 1. A `build task`_ 2. Which uses a toolchain task - `clang toolchain`_ - `rust toolchain`_ 3. Which uses a git fetch - `clang fetch`_ - (from-source ``dev`` builds only) `rust fetch`_ 4. (clang only) Which uses a `config json`_ 5. Which takes patches_ you may want to apply. For the most part, you should be able to accomplish what you want by copying/editing the existing examples in those files. .. _build task: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/build/linux.yml#5-45 .. _clang toolchain: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/toolchain/clang.yml#51-72 .. _rust toolchain: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/toolchain/rust.yml#57-74 .. _clang fetch: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/fetch/toolchains.yml#413-418 .. _rust fetch: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/fetch/toolchains.yml#434-439 .. _config json: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/build/build-clang/clang-linux64.json .. _patches: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/build/build-clang/static-llvm-symbolizer.patch Clang ----- Building clang is handled by `build-clang.py`_, which uses several resources in the `build-clang`_ directory. Read the `build-clang README`_ for more details. Note for local builds: build-clang.py can be run on developer machines but its lengthy multi-stage build process is unnecessary for most local development. The upstream `LLVM Getting Started Guide`_ has instructions on how to build clang more directly. .. _build-clang.py: https://searchfox.org/mozilla-central/source/build/build-clang/build-clang.py .. _build-clang README: https://searchfox.org/mozilla-central/source/build/build-clang/README .. _build-clang: https://searchfox.org/mozilla-central/source/build/build-clang/ .. _LLVM Getting Started Guide: https://llvm.org/docs/GettingStarted.html Rust ---- Rust builds are handled by `repack_rust.py`_. The primary purpose of that script is to download prebuilt tarballs from the Rust project. It uses the same basic format as `rustup` for specifying the toolchain (via ``--channel``): - request a stable build with ``1.xx.y`` (e.g. ``1.47.0``) - request a beta build with ``beta-yyyy-mm-dd`` (e.g. ``beta-2020-08-26``) - request a nightly build with ``nightly-yyyy-mm-dd`` (e.g. ``nightly-2020-08-26``) - request a build from `Rust's ci`_ with ``bors-$sha`` (e.g. ``bors-796a2a9bbe7614610bd67d4cd0cf0dfff0468778``) - request a from-source build with ``dev`` Rust From Source ---------------- As of this writing, from-source builds for Rust are a new feature, and not used anywhere by default. The feature was added so that we can test patches to rustc against the tree. Expect things to be a bit hacky and limited. Most importantly, building from source requires your toolchain to have a `fetch of the rust tree`_ as well as `clang and binutils toolchains`_. It is also recommended to upgrade the worker-type to e.g. ``b-linux-large``. Rust's build dependencies are fairly minimal, and it has a sanity check that should catch any missing or too-old dependencies. See the `Rust README`_ for more details. Patches are set via `the --patch flag`_ (passed via ``toolchain/rust.yml``). Patch paths are assumed to be relative to ``/build/build-rust/``, and may be optionally prefixed with ``module-path:`` to specify they apply to that git submodule in the Rust source. e.g. ``--patch src/llvm-project:mypatch.diff`` patches rust's llvm with ``/build/build-rust/mypatch.diff``. There are no currently checked in rust patches to use as an example, but they should be the same format as `the clang ones`_. Rust builds are not currently configurable, and uses a `hardcoded config.toml`_, which you may need to edit for your purposes. See Rust's `example config`_ for details/defaults. Note that these options do occasionally change, so be sure you're using options for the version you're targeting. For instance, there was a large change around Rust ~1.48, and the currently checked in config was for 1.47, so it may not work properly when building the latest version of Rust. Rust builds are currently limited to targeting only the host platform. Although the machinery is in place to request additional targets, the cross-compilation fails for some unknown reason. We have not yet investigated what needs to be done to get this working. While Rust generally maintains a clean tree for building ``rustc`` and ``cargo``, other tools like ``rustfmt`` or ``miri`` are allowed to be transiently broken. This means not every commit in the Rust tree will be able to build the `tools we require`_. Although ``repack_rust`` considers ``rustfmt`` an optional package, Rust builds do not currently implement this and will fail if ``rustfmt`` is busted. Some attempt was made to work around it, but `more work is needed`_. .. _Rust's ci: https://github.com/rust-lang/rust/pull/77875#issuecomment-736092083 .. _repack_rust.py: https://searchfox.org/mozilla-central/source/taskcluster/scripts/misc/repack_rust.py .. _fetch of the rust tree: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/toolchain/rust.yml#69-71 .. _clang and binutils toolchains: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/ci/toolchain/rust.yml#72-74 .. _the --patch flag: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/scripts/misc/repack_rust.py#667-675 .. _the clang ones: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/build/build-clang/static-llvm-symbolizer.patch .. _Rust README: https://github.com/rust-lang/rust/#building-on-a-unix-like-system .. _hardcoded config.toml: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/scripts/misc/repack_rust.py#384-421 .. _example config: https://github.com/rust-lang/rust/blob/b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18/config.toml.example .. _tools we require: https://searchfox.org/mozilla-central/rev/168c45a7acc44e9904cfd4eebcb9eb080e05699c/taskcluster/scripts/misc/repack_rust.py#398 .. _more work is needed: https://github.com/rust-lang/rust/issues/79249 Windows ======= The ``build/windows_toolchain.py`` script is used to build and manage Windows toolchain archives containing Visual Studio executables, SDKs, etc. The way Firefox build automation works is an archive containing the toolchain is produced and uploaded to an internal Mozilla server. The build automation will download, verify, and extract this archive before building. The archive is self-contained so machines don't need to install Visual Studio, SDKs, or various other dependencies. Unfortunately, Microsoft's terms don't allow Mozilla to distribute this archive publicly. However, the same tool can be used to create your own copy. Configuring Your System ----------------------- It is **highly** recommended to perform this process on a fresh installation of Windows 7 or 10 (such as in a VM). Installing all updates through Windows Update is not only acceptable - it is encouraged. Although it shouldn't matter. Next, install Visual Studio 2017 Community. The download link can be found at https://www.visualstudio.com/vs/community/. Be sure to follow these install instructions: 1. Choose a ``Custom`` installation and click ``Next`` 2. Select ``Programming Languages`` -> ``Visual C++`` (make sure all sub items are selected) 3. Under ``Windows and Web Development`` uncheck everything except ``Universal Windows App Development Tools`` and the items under it (should be ``Tools (1.3.1)...`` and the ``Windows 10 SDK``). Once Visual Studio 2017 Community has been installed, from a checkout of mozilla-central, run something like the following to produce a ZIP archive:: $ ./mach python build/windows_toolchain.py create-zip vs2017_15.8.4 The produced archive will be the argument to ``create-zip`` + ``.zip``. Firefox for Android with Gradle =============================== To build Firefox for Android with Gradle in automation, archives containing both the Gradle executable and a Maven repository comprising the exact build dependencies are produced and uploaded to an internal Mozilla server. The build automation will download, verify, and extract these archive before building. These archives provide a self-contained Gradle and Maven repository so that machines don't need to fetch additional Maven dependencies at build time. (Gradle and the downloaded Maven dependencies can be both redistributed publicly.) Archiving the Gradle executable is straight-forward, but archiving a local Maven repository is not. Therefore a toolchain job exists for producing the required archives, `android-gradle-dependencies`. The job runs in a container based on a custom Docker image and spawns a Sonatype Nexus proxying Maven repository process in the background. The job builds Firefox for Android using Gradle and the in-tree Gradle configuration rooted at ``build.gradle``. The spawned proxying Maven repository downloads external dependencies and collects them. After the Gradle build completes, the job archives the Gradle version used to build, and the downloaded Maven repository, and exposes them as Task Cluster artifacts. To update the version of Gradle in the archive produced, update ``gradle/wrapper/gradle-wrapper.properties``. Be sure to also update the SHA256 checksum to prevent poisoning the build machines! To update the versions of Gradle dependencies used, update ``dependencies`` sections in the in-tree Gradle configuration rooted at ``build.gradle``. Once you are confident your changes build locally, push a fresh build to try. The `android-gradle-dependencies` toolchain should run automatically, fetching your new dependencies and wiring them into the appropriate try build jobs. To update the version of Sonatype Nexus, update the `sonatype-nexus` `fetch` task definition. To modify the Sonatype Nexus configuration, typically to proxy a new remote Maven repository, modify `taskcluster/scripts/misc/android-gradle-dependencies/nexus.xml`. There is also a toolchain job that fetches the Android SDK and related packages. To update the versions of packaged fetched, modify `python/mozboot/mozboot/android-packages.txt` and update the various in-tree versions accordingly.