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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/../c/language/../compiler_support.html below:

C compiler support - cppreference.com

Note that this list may change, as the draft C23/2x standard evolves.

C23 feature Paper(s)

GCC

Clang

MSVC

Apple Clang

EDG eccp

Intel C++

Nvidia HPC C++ (ex PGI)*

Nvidia nvcc

Cray

static_assert with no message N2265 9 9 Yes Yes 6.5 2021.1.2 (clang based) [[nodiscard]] N2267 10 9 Yes 6.4 2021.1.2 (clang based) [[maybe_unused]] N2270 10 9 Yes 6.4 2021.1.2 (clang based) [[deprecated]] N2334 10 9 Yes 6.4 2021.1.2 (clang based) Attributes N2335
N2554 10 9 Yes 6.4 2021.1.2 (clang based) IEEE 754 decimal floating-point types N2341 4.2 (partial)*
12 13.0 (partial)* [[fallthrough]] N2408 10 9 Yes 6.4 2021.1.2 (clang based) u8 character constants N2418 10 15 6.5 2022.2 Removal of function definitions without prototype N2432 10 15 2022.2 [[nodiscard]] with message N2448 11 10 Yes 6.4 2021.1.2 (clang based) Unnamed parameters in function definitions N2480 11 11 Yes 6.4 2021.1.2 (clang based) Labels before declarations and end of blocks N2508 11 16 Partial* 6.5 17.0* Binary integer constants N2549 4.3*
11 2.9*
9 19.0 (2015)** Yes 6.5 11.0* __has_c_attribute in preprocessor conditionals N2553 11 9 Yes 6.5 2021.1.2 (clang based) Allow duplicate attributes N2557 11 13 Yes 6.5 2021.4 (clang-based IEEE 754 interchange and extended types N2601 7 (partial)*
14 6 (partial)* Partial* Digit separators N2626 12 13 19.0 (2015)** Yes 6.5 18.0* #elifdef and #elifndef N2645 12 13 19.40* 13.1.6* 6.5 2021.4 Type change of u8 string literals N2653 13 [[maybe_unused]] for labels N2662 11 16 6.5 2022.2 #warning N2686 Yes Yes Yes 6.5 Yes Bit-precise integer types (_BitInt) N2763 14 (partial)* 15 6.5 2022.2 [[noreturn]] N2764 13 15 6.5 2022.2 Suffixes for bit-precise integer constants N2775 14 15 2022.2 __has_include in preprocessor conditionals N2799 5 Yes 19.11* Yes 6.5 18.0 Identifier Syntax using Unicode Standard Annex 31 N2836 13 15 6.5 2022.2 Removal of function declarations without prototype N2841 13 15 2022.2 Empty initializers N2900 Partial*
13 Partial* Partial* Partial* Partial* typeof and typeof_unqual N2927
N2930 Partial*
13 Partial*
16 19.39* Partial* Partial* Partial* Partial* New spelling of keywords N2934 13 16 6.5 Predefined true and false N2935 13 15 2022.2 [[unsequenced]] and [[reproducible]] N2956 15 Relax requirements for variadic parameter list N2975 13 16 6.5 2023.1 Type inference in object definitions N3007 13 18 #embed N3017 15 19 constexpr objects N3018 13 19 Improved Normal Enumerations N3029 13 20* Enumerations with fixed underlying types N3030 13 20* __VA_OPT__ N3033 8
13 12 19.39* 6.5 Storage-class specifiers for compound literals N3038 13 nullptr N3042 13 16

C23 feature

Paper(s)

GCC