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kbd/docs/process/programming-language.md
Alexey Gladkov 9ab9874908
Use -std=gnu11 
Such a standard is used for linux kernel compilation. Since kbd follows
the linux kernel interfaces we can use the same standard for compiler.

Signed-off-by: Alexey Gladkov <legion@kernel.org>
2024-10-19 00:12:27 +02:00

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Programming Language

The kernel is written in the C programming language [c-language]. More precisely, the kernel is typically compiled with gcc [gcc] under -std=gnu11 [gcc-c-dialect-options]: the GNU dialect of ISO C11. clang [clang] is also supported.

This dialect contains many extensions to the language [gnu-extensions], and many of them are used within the kbd as a matter of course.

Attributes

One of the common extensions used throughout the kernel are attributes [gcc-attribute-syntax]. Attributes allow to introduce implementation-defined semantics to language entities (like variables, functions or types) without having to make significant syntactic changes to the language (e.g. adding a new keyword) [n2049].

In some cases, attributes are optional (i.e. a compiler not supporting them should still produce proper code, even if it is slower or does not perform as many compile-time checks/diagnostics).

Please refer to src/libcommon/compiler_attributes.h for more information.

[c-language] http://www.open-std.org/jtc1/sc22/wg14/www/standards [gcc] https://gcc.gnu.org [clang] https://clang.llvm.org [gcc-c-dialect-options] https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html [gnu-extensions] https://gcc.gnu.org/onlinedocs/gcc/C-Extensions.html [gcc-attribute-syntax] https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html [n2049] http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2049.pdf