Re: [PATCH v2] Documentation/llvm: add documentation on building w/ Clang/LLVM

[Masahiro Yamada <masahiroy@kernel.org>]

Hi.


On Wed, Feb 26, 2020 at 6:02 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> Added to kbuild documentation. Provides more official info on building
> kernels with Clang and LLVM than our wiki.
>
> Suggested-by: Randy Dunlap <rdunlap@infradead.org>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> Changes V1 -> V2:
> * s/On going/ongoing/
> * add Randy's Suggested-by


I do not understand this tag update.

As far as I saw the review process,
I do not think Randy deserves to have Suggested-by
because he just pointed out a typo (on going -> ongoing) :
https://patchwork.kernel.org/patch/11401189/#23179575

(or, was there off-line activity I had missed?)


> * add Nathan and Sedat's Reviewed-by
> * Upgrade Kees' Sugguested-by to Reviewed-by

We can add both

Suggested-by: Kees Cook <keescook@chromium.org>

and

Reviewed-by: Kees Cook <keescook@chromium.org>



I think Suggested-by and Reviewed-by should be orthogonal.


Thanks.






> * s/suffix/prefix/
>
>
>  Documentation/kbuild/index.rst |  1 +
>  Documentation/kbuild/llvm.rst  | 80 ++++++++++++++++++++++++++++++++++
>  2 files changed, 81 insertions(+)
>  create mode 100644 Documentation/kbuild/llvm.rst
>
> diff --git a/Documentation/kbuild/index.rst b/Documentation/kbuild/index.rst
> index 0f144fad99a6..3882bd5f7728 100644
> --- a/Documentation/kbuild/index.rst
> +++ b/Documentation/kbuild/index.rst
> @@ -19,6 +19,7 @@ Kernel Build System
>
>      issues
>      reproducible-builds
> +    llvm
>
>  .. only::  subproject and html
>
> diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
> new file mode 100644
> index 000000000000..d6c79eb4e23e
> --- /dev/null
> +++ b/Documentation/kbuild/llvm.rst
> @@ -0,0 +1,80 @@
> +==============================
> +Building Linux with Clang/LLVM
> +==============================
> +
> +This document covers how to build the Linux kernel with Clang and LLVM
> +utilities.
> +
> +About
> +-----
> +
> +The Linux kernel has always traditionally been compiled with GNU toolchains
> +such as GCC and binutils. Ongoing work has allowed for `Clang
> +<https://clang.llvm.org/>`_ and `LLVM <https://llvm.org/>`_ utilities to be
> +used as viable substitutes. Distributions such as `Android
> +<https://www.android.com/>`_, `ChromeOS
> +<https://www.chromium.org/chromium-os>`_, and `OpenMandriva
> +<https://www.openmandriva.org/>`_ use Clang built kernels.  `LLVM is a
> +collection of toolchain components implemented in terms of C++ objects
> +<https://www.aosabook.org/en/llvm.html>`_. Clang is a front-end to LLVM that
> +supports C and the GNU C extensions required by the kernel, and is pronounced
> +"klang," not "see-lang."
> +
> +Clang
> +-----
> +
> +The compiler used can be swapped out via `CC=` command line argument to `make`.
> +`CC=` should be set when selecting a config and during a build.
> +
> +       make CC=clang defconfig
> +
> +       make CC=clang
> +
> +Cross Compiling
> +---------------
> +
> +A single Clang compiler binary will typically contain all supported backends,
> +which can help simplify cross compiling.
> +
> +       ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make CC=clang
> +
> +`CROSS_COMPILE` is not used to prefix the Clang compiler binary, instead
> +`CROSS_COMPILE` is used to set a command line flag: `--target <triple>`. For
> +example:
> +
> +       clang --target aarch64-linux-gnu foo.c
> +
> +LLVM Utilities
> +--------------
> +
> +LLVM has substitutes for GNU binutils utilities. These can be invoked as
> +additional parameters to `make`.
> +
> +       make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
> +         OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-objsize \\
> +         READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\
> +         HOSTLD=ld.lld
> +
> +Getting Help
> +------------
> +
> +- `Website <https://clangbuiltlinux.github.io/>`_
> +- `Mailing List <https://groups.google.com/forum/#!forum/clang-built-linux>`_: <clang-built-linux@googlegroups.com>
> +- `Issue Tracker <https://github.com/ClangBuiltLinux/linux/issues>`_
> +- IRC: #clangbuiltlinux on chat.freenode.net
> +- `Telegram <https://t.me/ClangBuiltLinux>`_: @ClangBuiltLinux
> +- `Wiki <https://github.com/ClangBuiltLinux/linux/wiki>`_
> +- `Beginner Bugs <https://github.com/ClangBuiltLinux/linux/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22>`_
> +
> +Getting LLVM
> +-------------
> +
> +- http://releases.llvm.org/download.html
> +- https://github.com/llvm/llvm-project
> +- https://llvm.org/docs/GettingStarted.html
> +- https://llvm.org/docs/CMake.html
> +- https://apt.llvm.org/
> +- https://www.archlinux.org/packages/extra/x86_64/llvm/
> +- https://github.com/ClangBuiltLinux/tc-build
> +- https://github.com/ClangBuiltLinux/linux/wiki/Building-Clang-from-source
> +- https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/
> --
> 2.25.0.265.gbab2e86ba0-goog
>


--
Best Regards
Masahiro Yamada