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

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Jan 10, 2025
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[libc][docs] update docs on how to build linux kernel headers from src #122381

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14 changes: 6 additions & 8 deletions libc/docs/full_host_build.rst
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Expand Up @@ -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
===========================
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