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Sometimes [1] users may attempt to setup the Rust support by checking what Kbuild does and they end up finding out about `scripts/rust_is_available.sh`. Inevitably, they run the script directly, but unless they setup the required variables, the result of the script is not meaningful. We could add some defaults to the variables, but that could be confusing for those that may override the defaults (compared to their kernel builds), and `$CC` would not be a simple default in any case. Therefore, instead, explicitly check whether the expected variables are set (`$RUSTC`, `$BINDGEN` and `$CC`). If not, print an explanation about the fact that the script is meant to be called from Kbuild, since that is the most likely cause for the variables not being set. Link: https://lore.kernel.org/oe-kbuild-all/Y6r4mXz5NS0+HVXo@zn.tnic/ [1] Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20230616001631.463536-7-ojeda@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.