Compiler support for C23

C23

[edit] C23 core language features

This section is incomplete
Reason: status for Apple Clang and other compilers supporting C2x

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年1月2日 (clang based)
`[[nodiscard]]`	N2267	10	9	Yes	6.4	2021年1月2日 (clang based)
`[[maybe_unused]]`	N2270	10	9	Yes	6.4	2021年1月2日 (clang based)
`[[deprecated]]`	N2334	10	9	Yes	6.4	2021年1月2日 (clang based)
Attributes	N2335 N2554	10	9	Yes	6.4	2021年1月2日 (clang based)
IEEE 754 decimal floating-point types	N2341	4.2 (partial)* 12	13.0 (partial)*
`[[fallthrough]]`	N2408	10	9	Yes	6.4	2021年1月2日 (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年1月2日 (clang based)
Unnamed parameters in function definitions	N2480	11	11	Yes	6.4	2021年1月2日 (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年1月2日 (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	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray

[edit] C23 library features

This section is incomplete
Reason: a different list for C standard libraries

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Compiler support for C23

[edit] C23 core language features

[edit] C23 library features

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