C compiler support

From cppreference.com

Compiler support
Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Strings library
Algorithms
Numerics
Date and time utilities
Input/output support
Localization support
Concurrency support(C11)
Technical Specifications
Symbol index

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Compiler support

C99
C23

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This page is maintained as best-effort and may lag behind most recent compiler releases. If you see something is out-of-date, please help us by updating it!

[edit] C23 features

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

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[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	2021.1.2 (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 offunction 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 offunction 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
Predefinedtrue andfalse	N2935	13	15				2022.2
`[[unsequenced]]` and`[[reproducible]]`	N2956	15
Relax requirements forvariadic 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

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[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 inidentifiers		3.1	Yes	Yes
Increasedtranslation limits	N590	0.9	N/A
//comments	N644	2.7	Yes	Yes
`restrict` pointers	N448	2.95	Yes	partial*
Enhancedarithmetic 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 inenumerator-list		0.9	Yes	Yes
Hexadecimalfloating 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
Implicitreturn0; 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 andstatic 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