[libc++] Refactor the configuration macros to being always defined (#112094)

This is a follow-up to #89178. This updates the `<__config_site>`
macros.

[libc++] Make std::jthread supported in non-experimental mode (#107900)

We waited before supporting std::jthread fully because we wanted to
investigate other implementation strategies (in particula

[libc++] Make std::jthread supported in non-experimental mode (#107900)

We waited before supporting std::jthread fully because we wanted to
investigate other implementation strategies (in particular one involving
std::mutex). Since then, we did some benchmarking and decided that we
wouldn't be moving forward with std::mutex. Hence, there is no real
reason to punt on making std::jthread & friends non-experimental.

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[libc++][test] Make the feature-test macro tests more portable (#74185)

Found while running libc++'s test suite with MSVC's STL.

This is a followup to @philnik777's recent #71002 (thank you!) whi

[libc++][test] Make the feature-test macro tests more portable (#74185)

Found while running libc++'s test suite with MSVC's STL.

This is a followup to @philnik777's recent #71002 (thank you!) which
provided the existing examples of `__cpp_lib_barrier` and
`__cpp_lib_polymorphic_allocator`:

https://github.com/llvm/llvm-project/blob/66a3e4fafb6eae19764f8a192ca3a116c0554211/libcxx/utils/generate_feature_test_macro_components.py#L199-L203

https://github.com/llvm/llvm-project/blob/66a3e4fafb6eae19764f8a192ca3a116c0554211/libcxx/utils/generate_feature_test_macro_components.py#L866-L870

Applying that new pattern to the feature-test macros here gets their
corresponding tests passing for us.

:robot: Only `generate_feature_test_macro_components.py` was manually
updated; the other files were regenerated.

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[libc++][NFC] Refactor _LIBCPP_AVAILABILITY_HAS_* macros to always be defined (#71002)

This makes the conditionals quite a bit simpler to understand, since it
avoids double negatives and makes sure

[libc++][NFC] Refactor _LIBCPP_AVAILABILITY_HAS_* macros to always be defined (#71002)

This makes the conditionals quite a bit simpler to understand, since it
avoids double negatives and makes sure we have <__availability>
included. For vendors which use availability macros, it also enforces
that they check when specific features are introduced and define the
macro for their platform appropriately.

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[libc++] Implement `std::condition_variable_any::wait[_for/until]` overloads that take `stop_token`

- This is section 32.6.4 of P0660R10
- https://eel.is/c++draft/thread.condvarany.intwait

Differen

[libc++] Implement `std::condition_variable_any::wait[_for/until]` overloads that take `stop_token`

- This is section 32.6.4 of P0660R10
- https://eel.is/c++draft/thread.condvarany.intwait

Differential Revision: https://reviews.llvm.org/D153441

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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++][format] Implements formatter thread::id.

Since stacktrace header is WIP and it's not sure that will be done
before LLVM17 update the documentation. When the header is implemented
implementi

[libc++][format] Implements formatter thread::id.

Since stacktrace header is WIP and it's not sure that will be done
before LLVM17 update the documentation. When the header is implemented
implementing the formatter is trivial, so that can be done quickly
afterwards.

Implements parts of:
- P2693R1 Formatting thread::id and stacktrace

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D144331

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[runtimes] Rename various libcpp-has-no-XYZ Lit features to just no-XYZ

Since those features are general properties of the environment, it makes
sense to use them from libc++abi too, and so the name

[runtimes] Rename various libcpp-has-no-XYZ Lit features to just no-XYZ

Since those features are general properties of the environment, it makes
sense to use them from libc++abi too, and so the name libcpp-has-no-xxx
doesn't make sense.

Differential Revision: https://reviews.llvm.org/D126482

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

We don't really need to run them.