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docs: rust: include other expressions in conditional compilation section

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Expand the conditional compilation section to explain how to support
other expressions, such as testing whether `RUSTC_VERSION` is at least
a given version, which requires a numerical comparison that Rust's `cfg`
predicates do not support (yet?).

Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20240902165535.1101978-7-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Miguel Ojeda 2024-09-02 18:55:33 +02:00
parent aeb0e24abb
commit 93dc3be194
1 changed files with 8 additions and 0 deletions
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8
Documentation/rust/general-information.rst
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@ -151,3 +151,11 @@ configuration:
#[cfg(CONFIG_X="y")] // Enabled as a built-in (`y`)
#[cfg(CONFIG_X="m")] // Enabled as a module (`m`)
#[cfg(not(CONFIG_X))] // Disabled
For other predicates that Rust's ``cfg`` does not support, e.g. expressions with
numerical comparisons, one may define a new Kconfig symbol:
.. code-block:: kconfig
config RUSTC_VERSION_MIN_107900
def_bool y if RUSTC_VERSION >= 107900