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Compiler support for C++26

From cppreference.com

* - hover over a cell marked with the star * to see additional pop-up notes.
DRnn - the number nn after "DR" denotes target C++ revision the Defect Report is applied to, e.g., DR20 → C++20.

[edit] C++26 core language features

C++26 feature

 
Paper(s)

 
GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
IBM XL C++
IBM Open XL C++ for AIX
IBM Open XL C++ for z/OS
Sun/Oracle C++
Embarcadero C++ Builder
Cray
Nvidia HPC C++ (ex PGI)*
Nvidia nvcc
DR98: Removing undefined behavior from lexing P2621R2 Yes 3.3
DR98: Making non-encodable string literals ill-formed P1854R4 14 14
Unevaluated strings P2361R6 14 17 (partial)*
18
Adding @, $, and ` to the basic character set P2558R2 Yes
constexpr cast from void* P2738R1 14 17
DR20: On the ignorability of standard attributes P2552R2 Yes
DR11: Static storage for braced initializers P2752R2 14
User-generated static_assert messages P2741R3 14 17
Placeholder variables with no name P2169R4 14 18
Pack indexing P2662R3 19
Removing deprecated arithmetic conversion on enumerations P2864R2 14 18
DR11/20: Template parameter initialization P2308R1 18
Disallow binding a returned reference to a temporary P2748R5 14
Attributes for structured bindings P0609R3 15 19
Erroneous behavior for uninitialized reads P2795R5
= delete("reason"); P2573R2 15 19
Variadic friends P2893R3 15
DR98: Clarifying rules for brace elision in aggregate initialization P3106R1 17
DR20: Disallow module declarations to be macros P3034R1
DR11: Trivial infinite loops are not undefined behavior P2809R3 14 19
 

C++26 feature
 

Paper(s)
GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
IBM XL C++
IBM Open XL C++ for AIX
IBM Open XL C++ for z/OS
Sun/Oracle C++
Embarcadero C++ Builder
Cray
Nvidia HPC C++ (ex PGI)*
Nvidia nvcc

[edit] C++26 library features

C++26 feature

 
Paper(s)

 
GCC libstdc++
Clang libc++
MSVC STL
Apple Clang*
IBM Open XL C/C++ for AIX*
Sun/Oracle C++*
Embarcadero C++ Builder*
Testing for success or failure of <charconv> functions P2497R0 14 18
std::text_encoding: text encodings identification P1885R12 14
Arithmetic overloads of std::to_string and std::to_wstring use std::format P2587R3 14
Type checking format args P2757R3
Formatting pointers P2510R3 14* 17* 19.40**
Hashing support for std::chrono value classes P2592R3
Read-Copy Update P2545R4
Hazard Pointers P2530R3
ADL-proof std::projected P2538R1 14* 18* 19.38**
constexpr stable sorting P2562R1
Member visit P2637R3 18 (partial)*
19
std::is_within_lifetime 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 14 18
Interfacing string streams with std::string_view P2495R3 19
Interfacing std::bitset with std::string_view P2697R1 18
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 14 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
Saturation Arithmetic P0543R3 14 18
<debugging>: Debugging Support P2546R5
P2810R3
<linalg>: A free function linear algebra interface based on the BLAS P1673R13
Making assert() macro user friendly P2264R7
Runtime format strings P2918R2 14 18
std::span over an initializer list P2447R4 18
std::span::at() P2821R5 14 18
Added tuple protocol to std::complex P2819R2 19
A new specification for std::generate_canonical P0952R1
Removing deprecated typedef std::allocator::is_always_equal P2868R1 18
Removing function overload of std::basic_string::reserve() that takes no argument P2870R3 18
Remove deprecated Unicode conversion facets (<codecvt>) P2871R3 18
Freestanding: removing std::strtok P2937R0 14 19.40*
Freestanding Library: Partial Classes P2407R5 14
Freestanding Library: inout expected span P2833R2 14
DR23: std::basic_const_iterator should follow its underlying type’s convertibility P2836R1 14 19.40*
DR20: std::make_format_args now accepts only lvalue references instead of forwarding references P2905R2 14 18 19.40*
DR20: Fix formatting of code units as integers P2909R4 13.3 18 19.40*
views::concat P2542R7 15
Concatenation of strings and string views P2591R5
Enabling list-initialization for algorithms P2248R8
std::ranges::generate_random P1068R10
Comparisons for std::reference_wrapper P2944R3 14 19 (partial)*
Padded mdspan layouts P2642R5
New CTAD for std::span and std::mdspan with integral constants P3029R1 19
Atomic maximum and minimum P0493R5
std::formatter<std::filesystem::path> P2845R6
Printing Blank Lines with std::println() P3142R0 14* 19* 19.41**
Undeprecate std::polymorphic_allocator::destroy P2875R4 15 19.41*
Remove Deprecated strstreams P2867R1 19
Remove Deprecated std::shared_ptr Atomic Access APIs P2869R4 19
Remove std::wstring_convert P2872R3 19
DR23: Permit an efficient implementation of std::print P3107R3
 

C++26 feature
 

Paper(s)
GCC libstdc++
Clang libc++
MSVC STL
Apple Clang*
IBM Open XL C/C++ for AIX*
Sun/Oracle C++*
Embarcadero C++ Builder*