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Documentation: Describe extra clang tools built alongside BuildClang.sh

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Also rephrase some of the information on updated clang-format binaries
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Andrew Kaster 2022-12-04 09:26:05 -07:00 committed by Andrew Kaster
parent 67b50d7994
commit 77a22268c6
Notes: sideshowbarker 2024-07-17 06:29:49 +09:00 
Author: https://github.com/ADKaster
Commit: https://github.com/SerenityOS/serenity/commit/77a22268c6
Pull-request: https://github.com/SerenityOS/serenity/pull/16307
Reviewed-by: https://github.com/bgianfo ✅
Reviewed-by: https://github.com/supercomputer7 ✅
2 changed files with 21 additions and 11 deletions
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2
CONTRIBUTING.md
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@ -40,7 +40,7 @@ Nobody is perfect, and sometimes we mess things up. That said, here are some goo
**Do:**
* Write in idiomatic SerenityOS C++20, using the `AK` containers in all code.
* Conform to the project coding style found in [CodingStyle.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Use `clang-format` (version 15 or later) to automatically format C++ files. See [AdvancedBuildInstructions.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md) in Clang-format updates section to check how to acquire the tool.
* Conform to the project coding style found in [CodingStyle.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Use `clang-format` (version 15 or later) to automatically format C++ files. See [AdvancedBuildInstructions.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/AdvancedBuildInstructions.md#clang-format-updates) for instructions on how to get an up-to-date version if your OS distribution does not ship clang-format-15.
* Choose expressive variable, function and class names. Make it as obvious as possible what the code is doing.
* Split your changes into separate, atomic commits (i.e. A commit per feature or fix, where the build, tests and the system are all functioning).
* Make sure your commits are rebased on the master branch.

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Documentation/AdvancedBuildInstructions.md
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@ -199,12 +199,12 @@ Alternatively, you may prefer to copy `Build/_disk_image` and `Build/Kernel/Kern
SerenityOS can also be built with the [Clang](https://en.wikipedia.org/wiki/Clang) compiler instead of GCC. This is
useful for stopping us from relying on compiler-specific behavior, and the built-in static analyzer helps us catch more
bugs. Code compiled with both of these toolchains works identically in most cases, with the limitation that ports
bugs. Code compiled with both of these toolchains works identically in most cases, with the limitation that ports
can't be built with Clang yet.
To build the Clang-based toolchain, run `BuildClang.sh` from the `Toolchain` directory. The script defaults to building
the tooling needed for 32-bit SerenityOS, but the `ARCH=x86_64` environment variable can be set to build the 64-bit
toolchain.
To build the Clang-based toolchain, run `BuildClang.sh` from the `Toolchain` directory. The script will build a Clang
toolchain that is capable of building applications for the build host and serenity,
for all supported architecutres (i686, x86_64 and aarch64).
**Warning:** While the build script is running, your computer may slow down extremely or even lock up for short
intervals. This generally happens if you have more CPU cores than free RAM in gigabytes. To fix this, limit the number
@ -212,12 +212,22 @@ of parallel compile tasks be setting the `MAKEJOBS` environment variable to a nu
Once the build script finishes, you can use it to compile SerenityOS. Either set the `SERENITY_TOOLCHAIN` build
option to `Clang` as shown [above](#cmake-build-options), or pass `Clang` as the TOOLCHAIN option to
`Meta/serenity.sh`, for example: `Meta/serenity.sh run i686 Clang`.
`Meta/serenity.sh`, for example: `Meta/serenity.sh run x86_64 Clang`.
Building the clang-based toolchain also builds libTooling-based tools such as clang-format, clang-tidy and (optionally)
clangd that are aware of SerenityOS as a valid target. These tools will be installed into ``Toolchain/Local/clang/bin`` by
the script. Pointing your editor's plugins to the custom-built clang tools and a ``compile_commands.json`` from a clang build
of Serenity can enable richer error reporting than the tools that are installed for the build host.
To enable building clangd as part of the clang toolchain, set ``CLANG_ENABLE_CLANGD`` to ON in
``Toolchain/CMake/LLVMConfig.cmake`` before running BuildClang.sh. If you already built the clang toolchain and would like to
enable the custom clangd build, change the CMake cache variable ``CLANG_ENABLE_CLANGD`` to ON in ``Toolchain/Build/clang/llvm``
and re-install with ``cd Toolchain/Build/clang/llvm && cmake ../../../Tarballs/llvm-project-$LLVM_VERSION.src/llvm -DCLANG_ENABLE_CLANGD=ON && ninja install/strip``, where $LLVM_VERSION should be tab-completable in your shell.
## Clang-format updates
There are 3 options to acquire an updated clang-format tool:
1) If you have a Debian-based (apt-based) distribution, refer to [SelfHostedRunners.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/SelfHostedRunners.md) document to learn more about using the LLVM apt repositories to install the latest clang-format tool.
2) Compile using `Toolchain/BuildClang.sh` as being pointed above use the compiled `Toolchain/Local/clang/bin/clang-format` binary.
3) Compile LLVM from source as pointed [here](https://llvm.org/docs/GettingStarted.html#compiling-the-llvm-suite-source-code).
Some OS distributions don't ship bleeding-edge clang-format binaries. Below are 3 options to acquire an updated clang-format tool, in order of preference:
1) If you have a Debian-based (apt-based) distribution, use the [LLVM apt repositories](https://apt.llvm.org) to install the latest release of clang-format.
2) Compile the SerenityOS-patched LLVM from source using ``Toolchain/BuildClang.sh`` as described above and use the compiled ``Toolchain/Local/clang/bin/clang-format`` binary in your editor and terminal. The meta-lint-ci pre-commit hook will automatically pick up the Toolchain clang-format binary.
3) Compile LLVM from source as described in the LLVM documentation [here](https://llvm.org/docs/GettingStarted.html#compiling-the-llvm-suite-source-code).