[libc++][strings] P2591R5: Concatenation of strings and string views (#88389)

Implemented: https://wg21.link/P2591R5
- https://eel.is/c++draft/string.syn
- https://eel.is/c++draft/string.op.plus

[libc++][strings] P2591R5: Concatenation of strings and string views (#88389)

Implemented: https://wg21.link/P2591R5
- https://eel.is/c++draft/string.syn
- https://eel.is/c++draft/string.op.plus

---------

Co-authored-by: Hristo Hristov <zingam@outlook.com>

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[libc++] Mark P2845R8 `__cpp_lib_format_path` and P2587R3 `__cpp_lib_to_string` as C++26 (#93255)

[P2845R8](https://wg21.link/P2845R8) "Formatting of
`std::filesystem::path`" and [P2587R3](https://

[libc++] Mark P2845R8 `__cpp_lib_format_path` and P2587R3 `__cpp_lib_to_string` as C++26 (#93255)

[P2845R8](https://wg21.link/P2845R8) "Formatting of
`std::filesystem::path`" and [P2587R3](https://wg21.link/P2587R3)
"`to_string` or not `to_string`" are C++26 features, so they should be
marked accordingly in `generate_feature_test_macro_components.py`.

I verified that without my changes, running the script produced no
edits. Then with my changes, I ran the script to regenerate all files,
with no other manual edits.

Found while running libc++'s tests with MSVC's STL, which noticed this
because it's currently a C++23-only implementation.

Note that @H-G-Hristov has a draft implementation of P2587R3: #78100

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[libc++] Fix P1206R7 feature test macros (#90914)

- Add missing `__cpp_lib_containers_ranges` feature test macro
- Constrain `__cpp_lib_ranges_to_container` to the `<ranges>` header,
since the sta

[libc++] Fix P1206R7 feature test macros (#90914)

- Add missing `__cpp_lib_containers_ranges` feature test macro
- Constrain `__cpp_lib_ranges_to_container` to the `<ranges>` header,
since the standard does not list it in containers' headers

Ref:
-
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1206r7.pdf#section.18
- https://eel.is/c++draft/support.limits#lib:__cpp_lib_containers_ranges
-
https://eel.is/c++draft/support.limits#lib:__cpp_lib_ranges_to_container

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[libc++] Update status page after the Tokyo meeting (#87395)

[libc++][ranges] Implement `ranges::to`.

Differential Revision: https://reviews.llvm.org/D142335

[libc++] Update status after Varna meeting.

This updates:
- The status tables
- Feature test macros
- New headers for modules
The latter avoids forgetting about modules when implementing the feature

[libc++] Update status after Varna meeting.

This updates:
- The status tables
- Feature test macros
- New headers for modules
The latter avoids forgetting about modules when implementing the feature
in a new header.

Reviewed By: #libc, philnik

Differential Revision: https://reviews.llvm.org/D153192

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[libc++] Adds C++26 support.

Clang has been updated to support C++26, this adds the same support for
libc++. At the moment C++23 and C++26 are identical. During the next
plenary in June the first C+

[libc++] Adds C++26 support.

Clang has been updated to support C++26, this adds the same support for
libc++. At the moment C++23 and C++26 are identical. During the next
plenary in June the first C++26 papers will be voted on.

Note like Clang this patch uses C++26 is the internal part and C++2c in
the user visible part.

Depends on D150795

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D151026

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[libc++] Updates C++2b to C++23.

During the ISO C++ Committee meeting plenary session the C++23 Standard
has been voted as technical complete.

This updates the reference to c++2b to c++23 and updat

[libc++] Updates C++2b to C++23.

During the ISO C++ Committee meeting plenary session the C++23 Standard
has been voted as technical complete.

This updates the reference to c++2b to c++23 and updates the __cplusplus
macro.

Note since we use clang-tidy 16 a small work-around is needed. Clang
knows -std=c++23 but clang-tidy not so for now force the lit compiler
flag to use -std=c++2b instead of -std=c++23.

Reviewed By: #libc, philnik, jloser, ldionne

Differential Revision: https://reviews.llvm.org/D150795

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[libc++] Improves feature-test macro diagnostics.

This was mentioned in review D131326.

Reviewed By: var-const, #libc, philnik

Differential Revision: https://reviews.llvm.org/D132293

[libc++] Implement P1423R3 (char8_t backward compatibility remediation)

Reviewed By: Mordante, #libc

Spies: h-vetinari, libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/

[libc++] Implement P1423R3 (char8_t backward compatibility remediation)

Reviewed By: Mordante, #libc

Spies: h-vetinari, libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/D129195

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[libc++] Implement P0980R1 (constexpr std::string)

Reviewed By: #libc, ldionne

Spies: daltenty, sdasgup3, ldionne, arichardson, MTC, ChuanqiXu, mehdi_amini, shauheen, antiagainst, nicolasvasilache,

[libc++] Implement P0980R1 (constexpr std::string)

Reviewed By: #libc, ldionne

Spies: daltenty, sdasgup3, ldionne, arichardson, MTC, ChuanqiXu, mehdi_amini, shauheen, antiagainst, nicolasvasilache, arpith-jacob, mgester, lucyrfox, aartbik, liufengdb, stephenneuendorffer, Joonsoo, grosul1, Kayjukh, jurahul, msifontes, tatianashp, rdzhabarov, teijeong, cota, dcaballe, Chia-hungDuan, wrengr, wenzhicui, arphaman, Mordante, miscco, Quuxplusone, smeenai, libcxx-commits

Differential Revision: https://reviews.llvm.org/D110598

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[libc++] Make .version.pass.cpp tests be compile-only tests

We don't really need to run them.