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| author | Miguel Ojeda <ojeda@kernel.org> | 2024-09-02 18:55:33 +0200 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2024-09-05 22:45:01 +0200 |
| commit | 93dc3be19450447a3a7090bd1dfb9f3daac3e8d2 (patch) | |
| tree | f926ebe3de38d83bf41af43633b2ac0d65fc2319 | |
| parent | aeb0e24abbebebff3b5ac65486c933d0ecd5cf81 (diff) | |
docs: rust: include other expressions in conditional compilation section
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>
| -rw-r--r-- | Documentation/rust/general-information.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/rust/general-information.rst b/Documentation/rust/general-information.rst index 2d76e09da121..6146b49b6a98 100644 --- a/Documentation/rust/general-information.rst +++ b/Documentation/rust/general-information.rst @@ -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 |