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[edit] C23 features
Note that this list may change, as the draft C23/2x standard evolves.
[edit] C23 core language features
| 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 | N2335N2554 | 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 | N2927N2930 | 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 | 813 | 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
[edit] C99 features
[edit] C99 core language features
| 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 | N815N601N620N638N657N694N809 | 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 | N631N696 | No | No | | | | | | | | | | C99 feature | Paper(s) | GCC | Clang | MSVC | Apple Clang | EDG eccp | Intel C++ | Nvidia HPC C++ (ex PGI)* | Nvidia nvcc | Cray | |