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[libc][docs] update docs on how to build linux kernel headers from src (#122381)

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It's simpler than the directions we have; which are very very Debian specific.
This commit is contained in:
Nick Desaulniers
2025-01-10 14:40:57 -08:00
committed by GitHub
parent 7979e1ba29
commit 85711bdda3
1 changed files with 6 additions and 8 deletions
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14
libc/docs/full_host_build.rst
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@@ -175,17 +175,15 @@ Linux Headers
=============
If you are using the full libc on Linux, then you will also need to install
Linux headers in your sysroot. The way to do this varies per system.
These instructions should work on a Debian-based x86_64 system:
Linux headers in your sysroot. Let's build them from source.
.. code-block:: sh
$> apt download linux-libc-dev
$> dpkg -x linux-libc-dev*deb .
$> cp -r usr/* /path/to/sysroot/
$> rm -r usr linux-libc-dev*deb
$> ln -s /path/to/sysroot/include/x86_64-linux-gnu/asm /path/to/sysroot/include/asm
$> git clone --depth=1 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git /tmp/linux
$> make LLVM=1 INSTALL_HDR_PATH=/path/to/sysroot -C /tmp/linux headers_install
The headers can be built to target non-host architectures by adding the
``ARCH={arm|arm64|i386}`` to the above invocation of ``make``.
Using your newly built libc
===========================