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docs: rust: add paragraph about finding a suitable libclang

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Sometimes users need to tweak the finding process of `libclang`
for `bindgen` via the `clang-sys`-provided environment variables.

Thus add a paragraph to the setting up guide, including a reference
to `clang-sys`'s relevant documentation.

Link: https://lore.kernel.org/rust-for-linux/CAKwvOdm5JT4wbdQQYuW+RT07rCi6whGBM2iUAyg8A1CmLXG6Nw@mail.gmail.com/
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Link: https://lore.kernel.org/r/20230616001631.463536-4-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Miguel Ojeda 2023-06-16 02:16:23 +02:00
parent dee3a6b819
commit eae90172c5
1 changed files with 17 additions and 0 deletions
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Documentation/rust/quick-start.rst
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@ -100,6 +100,23 @@ Install it via (note that this will download and build the tool from source)::
cargo install --locked --version $(scripts/min-tool-version.sh bindgen) bindgen
``bindgen`` needs to find a suitable ``libclang`` in order to work. If it is
not found (or a different ``libclang`` than the one found should be used),
the process can be tweaked using the environment variables understood by
``clang-sys`` (the Rust bindings crate that ``bindgen`` uses to access
``libclang``):
* ``LLVM_CONFIG_PATH`` can be pointed to an ``llvm-config`` executable.
* Or ``LIBCLANG_PATH`` can be pointed to a ``libclang`` shared library
or to the directory containing it.
* Or ``CLANG_PATH`` can be pointed to a ``clang`` executable.
For details, please see ``clang-sys``'s documentation at:
https://github.com/KyleMayes/clang-sys#environment-variables
Requirements: Developing
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