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diff --git a/build/docs/toolchains.rst b/build/docs/toolchains.rst new file mode 100644 index 0000000000..a0715f7409 --- /dev/null +++ b/build/docs/toolchains.rst @@ -0,0 +1,197 @@ +.. _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/vs/generate_yaml.py`` and ``build/vs/pack_vs.py`` scripts are +used to manage and build Windows toolchain archives containing Visual +Studio executables, SDKs, etc. + +The ``build/vs/generate_yaml.py`` script is used to generate one of the +YAML files used in the relevant toolchain task. The exact command line +used to generate the file is stored in the header of the YAML file itself. +Each YAML file records the necessary downloads from Microsoft servers to +install the required Visual Studio components given on the command line. + +The ``build/vs/pack_vs.py`` script takes a YAML file as input and generates +the corresponding toolchain artifact. + +Both scripts should be run via ``mach python``. + + +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. |