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Documentation: add minimum clang/llvm version

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Based on a vote at the LLVM BoF at Plumbers 2020, we decided to start
small, supporting just one formal upstream release of LLVM for now.

We can probably widen the support window of supported versions over
time.  Also, note that LLVM's release process is different than GCC's.
GCC tends to have 1 major release per year while releasing minor updates
to the past 3 major versions.  LLVM tends to support one major release
and one minor release every six months.

Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200826191555.3350406-1-ndesaulniers@google.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Change-Id: If202184bd0df307ca91bcaa814184af0ba66e21f
This commit is contained in:
Nick Desaulniers 2020-08-26 12:15:55 -07:00 committed by Michael Bestas
parent be51689e5e
commit 298914b170
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4
Documentation/kbuild/llvm.rst
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@ -1,3 +1,5 @@
.. _kbuild_llvm:
==============================
Building Linux with Clang/LLVM
==============================
@ -73,6 +75,8 @@ Getting Help
- `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:
Getting LLVM
-------------

15
Documentation/process/changes.rst
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@ -30,6 +30,7 @@ you probably needn't concern yourself with pcmciautils.
Program Minimal version Command to check the version
====================== =============== ========================================
GNU C 4.6 gcc --version
Clang/LLVM (optional) 10.0.1 clang --version
GNU make 3.81 make --version
binutils 2.21 ld -v
flex 2.5.35 flex --version
@ -68,6 +69,15 @@ GCC
The gcc version requirements may vary depending on the type of CPU in your
computer.
Clang/LLVM (optional)
---------------------
The latest formal release of clang and LLVM utils (according to
`releases.llvm.org <https://releases.llvm.org>`_) are supported for building
kernels. Older releases aren't guaranteed to work, and we may drop workarounds
from the kernel that were used to support older versions. Please see additional
docs on :ref:`Building Linux with Clang/LLVM <kbuild_llvm>`.
Make
----
@ -331,6 +341,11 @@ gcc
- <ftp://ftp.gnu.org/gnu/gcc/>
Clang/LLVM
----------
- :ref:`Getting LLVM <getting_llvm>`.
Make
----