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Compiler support for C++26

C++26 core language features

C++26 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	IBM XLC++	Sun/Oracle C++	Embarcadero C++ Builder	Cray	Nvidia HPC C++ (ex Portland Group/PGI)	Nvidia nvcc
DR: Removing undefined behavior from lexing	P2621R2	Yes	3.3
DR: Making non-encodable string literals ill-formed	P1854R4		14
Unevaluated strings	P2361R6		17 (partial)*
Adding `@`, `$`, and ` to the `basic character set`	P2558R2		Yes
`constexpr` cast from `void*`	P2738R1	14	17
DR: On the ignorability of standard attributes	P2552R2
DR: Static storage for braced initializers	P2752R2	14
User-generated `static_assert` messages	P2741R2		17
Placeholder variables with no name	P2169R4
C++26 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	IBM XLC++	Sun/Oracle C++	Embarcadero C++ Builder	Cray	Nvidia HPC C++ (ex Portland Group/PGI)	Nvidia nvcc

C++26 library features

C++26 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang	Sun/Oracle C++ Standard Library	Embarcadero C++ Builder Standard Library
Testing for success or failure of `<charconv>` functions	P2497R0
`std::text_encoding`: text encodings identification	P1885R12
Arithmetic overloads of `std::to_string` and `std::to_wstring` use `std::format`	P2587R3
Type checking format args	P2757R3
Formatting pointers	P2510R3	14	17
Hashing support for `std::chrono` value classes	P2592R3
Read-copy update (RCU)	P2545R4
Hazard pointers	P2530R3
ADL-proof `std::projected`	P2538R1	14		19.38*
constexpr stable sorting	P2562R1
Member `visit`	P2637R3
`std::is_within_lifetime` in constant evaluation	P2641R4
Extending associative containers with the remaining heterogeneous overloads	P2363R5
Enabling the use of `std::weak_ptr` as keys in unordered associative containers	P1901R2
Native handles in file streams	P1759R6
Interfacing string streams with `std::string_view`	P2495R3
Interfacing `std::bitset` with `std::string_view`	P2697R1
More constexpr for `<cmath>` and `<complex>`	P1383R2	4.6 (partial)*
Adding the new 2022 SI prefixes on ratios: `std::quecto`, `std::ronto`, `std::ronna`, and `std::quetta`	P2734R0		17
`std::function_ref`: type-erased callable reference	P0792R14
`std::copyable_function`	P2548R6
`std::bind_front`, `std::bind_back`, and `std::not_fn` to NTTP callables	P2714R1
`std::submdspan()`	P2630R4
Freestanding Language: Optional ::operator new	P2013R5			N/A
C++26 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang	Sun/Oracle C++ Standard Library	Embarcadero C++ Builder Standard Library

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