C compiler support

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[edit] C23 features

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

[edit]

[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

[edit] C99 features

[edit]

[edit] C99 core language features

This section is incomplete
Reason: needs to list C compilers, verification

C99 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray
Universal-character-names in identifiers	3.1	Yes	Yes
Increased translation limits	N590	0.9	N/A
// comments	N644	2.7	Yes	Yes
`restrict` pointers	N448	2.95	Yes	partial*
Enhanced arithmetic types	N815 N601 N620 N638 N657 N694 N809	Yes	partial	Maybe
Flexible array members	3.0	Yes	Yes
Variable-length array (VLA) types	N683	0.9	Yes
Variably-modified (VM) types	N2778	N/A	Yes
Designated initializers	N494	3.0	Yes	Yes
Non-constant initializers	1.21	N/A
Idempotent cvr-qualifiers	N505	3.0	N/A
Trailing comma in enumerator-list	0.9	Yes	Yes
Hexadecimal floating constants	N308	2.8	Yes	Yes
Compound literals	N716	3.1	Yes	Yes
Floating-point environment	partial	partial
Requiring truncation for divisions of signed integer types	N617	0.9	N/A
Implicit return 0; in the `main()` function	Yes	Yes	Yes
Declarations and statements in mixed order	N740	3.0	Yes	Yes
init-statement in `for` loops	Yes	Yes	Yes
`inline` functions	N741	4.3	Yes	Yes
Predefined variable `__func__`	N611	2.95	Yes	Yes
Cvr-qualifiers and static in [] within function declarations	3.1	Yes
Variadic macros	N707	2.95	Yes	Yes
`_Pragma` preprocessor operator	N634	3.0	Yes	partial*
Standard pragmas for floating-point evaluation	N631 N696	No	No
C99 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray

[edit] See also

C++ documentation for compiler support

cppreference.com

Namespaces

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