From 303d22c5fc37cebe2bd0b3c15ac3db6950db60c6 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Mon, 3 Sep 2018 18:32:11 +0200 Subject: [PATCH] Compiler Attributes: add Doc/process/programming-language.rst Tested-by: Sedat Dilek # on top of v4.19-rc5, clang 7 Reviewed-by: Nick Desaulniers Reviewed-by: Luc Van Oostenryck Signed-off-by: Miguel Ojeda --- Documentation/process/index.rst | 1 + .../process/programming-language.rst | 45 +++++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 Documentation/process/programming-language.rst diff --git a/Documentation/process/index.rst b/Documentation/process/index.rst index 9ae3e317bddf..00558b6d2649 100644 --- a/Documentation/process/index.rst +++ b/Documentation/process/index.rst @@ -23,6 +23,7 @@ Below are the essential guides that every developer should read. code-of-conduct development-process submitting-patches + programming-language coding-style maintainer-pgp-guide email-clients diff --git a/Documentation/process/programming-language.rst b/Documentation/process/programming-language.rst new file mode 100644 index 000000000000..e5f5f065dc24 --- /dev/null +++ b/Documentation/process/programming-language.rst @@ -0,0 +1,45 @@ +.. _programming_language: + +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=gnu89`` [gcc-c-dialect-options]_: the GNU dialect of ISO C90 +(including some C99 features). + +This dialect contains many extensions to the language [gnu-extensions]_, +and many of them are used within the kernel as a matter of course. + +There is some support for compiling the kernel with ``clang`` [clang]_ +and ``icc`` [icc]_ for several of the architectures, although at the time +of writing it is not completed, requiring third-party patches. + +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). + +The kernel defines pseudo-keywords (e.g. ``__pure``) instead of using +directly the GNU attribute syntax (e.g. ``__attribute__((__pure__))``) +in order to feature detect which ones can be used and/or to shorten the code. + +Please refer to ``include/linux/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 +.. [icc] https://software.intel.com/en-us/c-compilers +.. [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 +