Self-build linux kernel with clang

Self-build the linux kernel with clang. The method is written before It is almost the same as building with gcc. clang uses the one that was installed in the previous post.

environment

Preparation

Keep it in your PATH so that you can use the clang command.

% export PATH=(somewhere)/bin:$PATH

Get the source, deploy and patch it.

% wget https://kojipkgs.fedoraproject.org//packages/kernel/5.4.16/200.fc31/src/kernel-5.4.16-200
.fc31.src.rpm
% mkdir files
% cd files
% rpm2cpio ../kernel-5.4.16-200.fc31.src.rpm |cpio  -id
% tar Jxf  linux-5.4.tar.xz
% cd linux-5.4
% xz -dc ../patch-5.4.16.xz  | patch -p1
% for i in `ls ../*patch`;do;patch -p1 < $i;done

Build

Get the .config template and make oldconfig.

% cp ../kernel-x86_64-fedora.config .config
% yes "" | make CC=clang oldconfig

Now, run menuconfig and then build. Uncheck "Kernel hacking-> Compile-time checks and compiler options-> Generate BTF type info".

% make CC=clang menuconfig
% make -j12 CC=clang deb-pkg LOCALVERSION=-my KDEB_PKGVERSION=1

Installation

% cd ..
% su
# dpkg -i linux-image-5.4.16-my_1_amd64.deb linux-headers-5.4.16-my_1_amd64.deb

bonus

After rebooting and booting with the new kernel, you will see the following wording in /var/log/kern.log:

Feb  1 19:08:49 localpc kernel: [    0.000000] Linux version 5.4.16-my ([email protected]) (clang version 9.0.0 (tags/RELEASE_900/final)) #1 SMP Sat Feb 1 18:20:36 JST 2020

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