[libc++] Avoid including <string> in <mutex> (#116254)

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

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

[libc++][RFC] Always define internal feature test macros (#89178)

Currently, the library-internal feature test macros are only defined if
the feature is not available, and always have the prefix
`

[libc++][RFC] Always define internal feature test macros (#89178)

Currently, the library-internal feature test macros are only defined if
the feature is not available, and always have the prefix
`_LIBCPP_HAS_NO_`. This patch changes that, so that they are always
defined and have the prefix `_LIBCPP_HAS_` instead. This changes the
canonical use of these macros to `#if _LIBCPP_HAS_FEATURE`, which means
that using an undefined macro (e.g. due to a missing include) is
diagnosed now. While this is rather unlikely currently, a similar change
in `<__configuration/availability.h>` caught a few bugs. This also
improves readability, since it removes the double-negation of `#ifndef
_LIBCPP_HAS_NO_FEATURE`.

The current patch only touches the macros defined in `<__config>`. If
people are happy with this approach, I'll make a follow-up PR to also
change the macros defined in `<__config_site>`.

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[libc++] Split the monolithic __threading_support header (#79654)

The <__threading_support> header is a huge beast and it's really
difficult to navigate. I find myself struggling to find what I wan

[libc++] Split the monolithic __threading_support header (#79654)

The <__threading_support> header is a huge beast and it's really
difficult to navigate. I find myself struggling to find what I want
every time I have to open it, and I've been considering splitting it up
for years for that reason.

This patch aims not to contain any functional change. The various
implementations of the threading base are simply moved to separate
headers and then the individual headers are simplified in mechanical
ways. For example, we used to have redundant declarations of all the
functions at the top of `__threading_support`, and those are removed
since they are not needed anymore. The various #ifdefs are also
simplified and removed when they become unnecessary.

Finally, this patch adds documentation for the API we expect from any
threading implementation.

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[libc++][NFC] Refactor __enable_if return types to defaulted template parameters

This brings most of the enable_ifs in libc++ to the same style. It also has the nice side-effect of reducing the size

[libc++][NFC] Refactor __enable_if return types to defaulted template parameters

This brings most of the enable_ifs in libc++ to the same style. It also has the nice side-effect of reducing the size of names of these symbols, since the depedent return type is shorter.

Reviewed By: #libc, ldionne

Spies: ldionne, libcxx-commits

Differential Revision: https://reviews.llvm.org/D157787

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[libc++] Move __thread_id out of <__threading_support>

This makes <__threading_support> closer to handling only the bridge
between the system's implementation of threading and the rest of libc++.

D

[libc++] Move __thread_id out of <__threading_support>

This makes <__threading_support> closer to handling only the bridge
between the system's implementation of threading and the rest of libc++.

Differential Revision: https://reviews.llvm.org/D154464

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[libc++] Merge _LIBCPP_FUNC_VIS, _LIBCPP_TYPE_VIS and _LIBCPP_EXCEPTION_ABI into _LIBCPP_EXPORTED_FROM_ABI

These macros are always defined identically, so we can simplify the code a bit by merging t

[libc++] Merge _LIBCPP_FUNC_VIS, _LIBCPP_TYPE_VIS and _LIBCPP_EXCEPTION_ABI into _LIBCPP_EXPORTED_FROM_ABI

These macros are always defined identically, so we can simplify the code a bit by merging them.

Reviewed By: ldionne, #libc

Spies: libcxx-commits, krytarowski, smeenai

Differential Revision: https://reviews.llvm.org/D152652

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[libc++] Add hide_from_abi check for classes

We already have a clang-tidy check for making sure that `_LIBCPP_HIDE_FROM_ABI` is on free functions. This patch extends this to class members. The place

[libc++] Add hide_from_abi check for classes

We already have a clang-tidy check for making sure that `_LIBCPP_HIDE_FROM_ABI` is on free functions. This patch extends this to class members. The places where we don't check for `_LIBCPP_HIDE_FROM_ABI` are classes for which we have an instantiation in the library.

Reviewed By: ldionne, Mordante, #libc

Spies: jplehr, mikhail.ramalho, sstefan1, libcxx-commits, krytarowski, miyuki, smeenai

Differential Revision: https://reviews.llvm.org/D142332

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[libc++] Granularize system_error.

Reviewed By: #libc, philnik

Differential Revision: https://reviews.llvm.org/D147853

[libcxx] Fix build bustage with threads disabled

Building with -DLIBCXX_ENABLE_THREADS=OFF -DLIBCXXABI_ENABLE_THREADS=OFF
(like e.g. for wasm) fails after D146228 because of a misplaced std
namespac

[libcxx] Fix build bustage with threads disabled

Building with -DLIBCXX_ENABLE_THREADS=OFF -DLIBCXXABI_ENABLE_THREADS=OFF
(like e.g. for wasm) fails after D146228 because of a misplaced std
namespace begin/end.

Reviewed By: philnik, #libc

Differential Revision: https://reviews.llvm.org/D146682

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[libc++] Granularize __mutex_base

This also updates the moved code to the current style. (i.e. `_VSTD` -> `std`, `_LIBCPP_INLINE_VISIBILITY` -> `_LIBCPP_HIDE_FROM_ABI`, clang-format).

Reviewed By:

[libc++] Granularize __mutex_base

This also updates the moved code to the current style. (i.e. `_VSTD` -> `std`, `_LIBCPP_INLINE_VISIBILITY` -> `_LIBCPP_HIDE_FROM_ABI`, clang-format).

Reviewed By: Mordante, #libc, EricWF

Spies: arichardson, libcxx-commits, mikhail.ramalho

Differential Revision: https://reviews.llvm.org/D146228

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