mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 01:54:09 +08:00
50d228345a
no conflicts at all. This pull includes:
- A reworked and expanded user-mode Linux document
- Some simplifications and improvements for submitting-patches.rst
- An emergency fix for (some) problems with Sphinx 3.x
- Some welcome automarkup improvements to automatically generate
cross-references to struct definitions and other documents
- The usual collection of translation updates, typo fixes, etc.
-----BEGIN PGP SIGNATURE-----
iQFDBAABCAAtFiEEIw+MvkEiF49krdp9F0NaE2wMflgFAl+ErNYPHGNvcmJldEBs
d24ubmV0AAoJEBdDWhNsDH5Y284H/3bv9fahbg16AJcKYqJXFHGpDs3CsASPnJqQ
9HQoV5tg6Qd4kI3oFb+30l8SK73Wr2t685/DhOPDRR/vN3B5M1vOQvPRL/dEqiwi
aUEhtMbnC/trSbteXsjGDWT+1EnI/+R3NFV++WiRp1XxE4DRXL3xySTeviR0IW+V
rQxU7VCcVp0bklVH+gqjrsvqU5iZeckyZB6evc8X92ThhzjNprR5KVxxgl1wxcu/
dPYizHoKYVoLVNw50rwPGt2hmq9RpyDM6Xh9UhLHcA57ENyzr8NNTJBOT0tVMTWV
smU01X/ECoy54kj1w8AKP+f7F0G7DUU+Jz68X0X/kYPq520dUs4=
=Ovox
-----END PGP SIGNATURE-----
Merge tag 'docs-5.10' of git://git.lwn.net/linux
Pull documentation updates from Jonathan Corbet:
"As hoped, things calmed down for docs this cycle; fewer changes and
almost no conflicts at all. This includes:
- A reworked and expanded user-mode Linux document
- Some simplifications and improvements for submitting-patches.rst
- An emergency fix for (some) problems with Sphinx 3.x
- Some welcome automarkup improvements to automatically generate
cross-references to struct definitions and other documents
- The usual collection of translation updates, typo fixes, etc"
* tag 'docs-5.10' of git://git.lwn.net/linux: (81 commits)
gpiolib: Update indentation in driver.rst for code excerpts
Documentation/admin-guide: tainted-kernels: Fix typo occured
Documentation: better locations for sysfs-pci, sysfs-tagging
docs: programming-languages: refresh blurb on clang support
Documentation: kvm: fix a typo
Documentation: Chinese translation of Documentation/arm64/amu.rst
doc: zh_CN: index files in arm64 subdirectory
mailmap: add entry for <mstarovoitov@marvell.com>
doc: seq_file: clarify role of *pos in ->next()
docs: trace: ring-buffer-design.rst: use the new SPDX tag
Documentation: kernel-parameters: clarify "module." parameters
Fix references to nommu-mmap.rst
docs: rewrite admin-guide/sysctl/abi.rst
docs: fb: Remove vesafb scrollback boot option
docs: fb: Remove sstfb scrollback boot option
docs: fb: Remove matroxfb scrollback boot option
docs: fb: Remove framebuffer scrollback boot option
docs: replace the old User Mode Linux HowTo with a new one
Documentation/admin-guide: blockdev/ramdisk: remove use of "rdev"
Documentation/admin-guide: README & svga: remove use of "rdev"
...
92 lines
3.0 KiB
ReStructuredText
92 lines
3.0 KiB
ReStructuredText
.. _kbuild_llvm:
|
|
|
|
==============================
|
|
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. Kbuild supports ``LLVM=1``
|
|
to enable them. ::
|
|
|
|
make LLVM=1
|
|
|
|
They can be enabled individually. The full list of the parameters: ::
|
|
|
|
make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \
|
|
OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \
|
|
READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \
|
|
HOSTLD=ld.lld
|
|
|
|
Currently, the integrated assembler is disabled by default. You can pass
|
|
``LLVM_IAS=1`` to enable it.
|
|
|
|
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:
|
|
|
|
Getting LLVM
|
|
-------------
|
|
|
|
- https://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/
|