1 .. _programming_language:
2
3 Programming Language
4 ====================
5
6 The kernel is written in the C programming lan
7 More precisely, the kernel is typically compil
8 under ``-std=gnu11`` [gcc-c-dialect-options]_:
9 ``clang`` [clang]_ is also supported, see docs
10 :ref:`Building Linux with Clang/LLVM <kbuild_l
11
12 This dialect contains many extensions to the l
13 and many of them are used within the kernel as
14
15 Attributes
16 ----------
17
18 One of the common extensions used throughout t
19 [gcc-attribute-syntax]_. Attributes allow to i
20 implementation-defined semantics to language e
21 functions or types) without having to make sig
22 to the language (e.g. adding a new keyword) [n
23
24 In some cases, attributes are optional (i.e. a
25 should still produce proper code, even if it i
26 as many compile-time checks/diagnostics).
27
28 The kernel defines pseudo-keywords (e.g. ``__p
29 directly the GNU attribute syntax (e.g. ``__at
30 in order to feature detect which ones can be u
31
32 Please refer to ``include/linux/compiler_attri
33
34 Rust
35 ----
36
37 The kernel has experimental support for the Ru
38 [rust-language]_ under ``CONFIG_RUST``. It is
39 under ``--edition=2021`` [rust-editions]_. Edi
40 small changes to the language that are not bac
41
42 On top of that, some unstable features [rust-u
43 the kernel. Unstable features may change in th
44 goal to reach a point where only stable featur
45
46 Please refer to Documentation/rust/index.rst f
47
48 .. [c-language] http://www.open-std.org/jtc1/s
49 .. [gcc] https://gcc.gnu.org
50 .. [clang] https://clang.llvm.org
51 .. [gcc-c-dialect-options] https://gcc.gnu.org
52 .. [gnu-extensions] https://gcc.gnu.org/online
53 .. [gcc-attribute-syntax] https://gcc.gnu.org/
54 .. [n2049] http://www.open-std.org/jtc1/sc22/w
55 .. [rust-language] https://www.rust-lang.org
56 .. [rustc] https://doc.rust-lang.org/rustc/
57 .. [rust-editions] https://doc.rust-lang.org/e
58 .. [rust-unstable-features] https://github.com
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