[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002)

This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-

[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002)

This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the
RFC, we initially proposed selecting the right headers from the Clang
driver, however consensus seemed to steer towards handling this in the
library itself. This patch implements that direction.

At a high level, the changes basically amount to making each public
header look like this:

```
// inside <vector>
#ifdef _LIBCPP_CXX03_LANG
# include <__cxx03/vector>
#else
// normal <vector> content
#endif
```

In most cases, public headers are simple umbrella headers so there isn't
much code in the #else branch. In other cases, the #else branch contains
the actual implementation of the header.

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[libc++] Add #if 0 block to all the top-level headers (#119234)

Including The frozen C++03 headers results in a lot of formatting
changes in the main headers, so this splits these changes into a
sep

[libc++] Add #if 0 block to all the top-level headers (#119234)

Including The frozen C++03 headers results in a lot of formatting
changes in the main headers, so this splits these changes into a
separate commit instead.

This is part of
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.

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[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++] Handle _LIBCPP_HAS_NO_{THREADS,LOCALIZATION} consistently with other carve-outs (#98319)

Previously, we would issue an #error when using a header that requires
threading support or localiz

[libc++] Handle _LIBCPP_HAS_NO_{THREADS,LOCALIZATION} consistently with other carve-outs (#98319)

Previously, we would issue an #error when using a header that requires
threading support or localization support in a configuration where that
is disabled. This is unlike what we do for all the other carve outs like
no-filesystem, no-wide-characters or no-random-device. Instead of
issuing an #error, we normally just remove the problematic parts of the
header.

This patch makes the handling of no-localization and no-threads
consistent with the other carve-outs. I dislike the fact that users
won't get an explicit error message when trying to use e.g. ios in a
build that doesn't support localization, but I think it is better to
handle things consistently. Note that besides the consistency argument,
the #error approach doesn't really work anyways since it would break
down if we moved towards assuming the C locale only in the
no-localization mode.

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[libc++][NFC] Run clang-format on libcxx/include again (#95874)

As time went by, a few files have become mis-formatted w.r.t.
clang-format. This was made worse by the fact that formatting was not

[libc++][NFC] Run clang-format on libcxx/include again (#95874)

As time went by, a few files have become mis-formatted w.r.t.
clang-format. This was made worse by the fact that formatting was not
being enforced in extensionless headers. This commit simply brings all
of libcxx/include in-line with clang-format again.

We might have to do this from time to time as we update our clang-format
version, but frankly this is really low effort now that we've formatted
everything once.

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[libc++][NFC] Remove a few unused <__availablity> includes (#86126)

[libc++] Clean up includes of <__assert> (#80091)

Originally, we used __libcpp_verbose_abort to handle assertion failures.
That function was declared from all public headers. Since we don't use
th

[libc++] Clean up includes of <__assert> (#80091)

Originally, we used __libcpp_verbose_abort to handle assertion failures.
That function was declared from all public headers. Since we don't use
that mechanism anymore, we don't need to declare __libcpp_verbose_abort
from all public headers, and we can clean up a lot of unnecessary
includes.

This patch also moves the definition of the various assertion categories
to the <__assert> header, since we now rely on regular IWYU for these
assertion macros.

rdar://105510916

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[libc++][NFC] Reformat a few files that had gotten mis-formatted

Those appear to be oversights when committing patches
in the last few months.

[libc++] Improves _LIBCPP_HAS_NO_THREADS guards. (#76624)

Previously the header included several headers, possibly granularized
threading headers. This could lead to build errors when these headers

[libc++] Improves _LIBCPP_HAS_NO_THREADS guards. (#76624)

Previously the header included several headers, possibly granularized
threading headers. This could lead to build errors when these headers
were incompatible with threading disabled.

Now test the guard before inclusion. This matches the pattern used for
no localization and no wide characters.

Fixes: https://github.com/llvm/llvm-project/issues/76620

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[libc++] Replace uses of _VSTD:: by std:: (#74331)

As part of the upcoming clang-formatting of libc++, this patch performs
the long desired removal of the _VSTD macro.

See https://discourse.llvm

[libc++] Replace uses of _VSTD:: by std:: (#74331)

As part of the upcoming clang-formatting of libc++, this patch performs
the long desired removal of the _VSTD macro.

See https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all
for the clang-format proposal.

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[libc++] Remove availability annotations which can never be triggered (#69226)

According to https://developer.apple.com/support/xcode/, quite a few of
our availability macros don't do anything anym

[libc++] Remove availability annotations which can never be triggered (#69226)

According to https://developer.apple.com/support/xcode/, quite a few of
our availability macros don't do anything anymore, so we might as well
remove them to clean up the code a bit.

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[libc++] Fix template parameter naming and enforce it through readability-identifier-naming

Reviewed By: #libc, Mordante

Spies: Mordante, aheejin, libcxx-commits

Differential Revision: https://rev

[libc++] Fix template parameter naming and enforce it through readability-identifier-naming

Reviewed By: #libc, Mordante

Spies: Mordante, aheejin, libcxx-commits

Differential Revision: https://reviews.llvm.org/D156059

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[libc++] Fix thread annotations on shared_mutex and shared_timed_mutex

Based on the comment in https://reviews.llvm.org/D54290#4418958, these
attributes need to be on the top-level functions in orde

[libc++] Fix thread annotations on shared_mutex and shared_timed_mutex

Based on the comment in https://reviews.llvm.org/D54290#4418958, these
attributes need to be on the top-level functions in order to work
properly. Also, add tests.

Fixes http://llvm.org/PR57035.

Differential Revision: https://reviews.llvm.org/D154354

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[libc++][NFC] clang-format <shared_mutex>

I am about to touch several lines in that file for a patch anyway, so
I might as well clang-format it upfront to avoid mixing styles after
my patch.

[libc++][NFC] Remove a redundant check for building the library

[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

[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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[libc++][NFC] Replace _LIBCPP_STD_VER > x with _LIBCPP_STD_VER >= x

This change is almost fully mechanical. The only interesting change is in `generate_feature_test_macro_components.py` to generate

[libc++][NFC] Replace _LIBCPP_STD_VER > x with _LIBCPP_STD_VER >= x

This change is almost fully mechanical. The only interesting change is in `generate_feature_test_macro_components.py` to generate `_LIBCPP_STD_VER >=` instead. To avoid churn in the git-blame this commit should be added to the `.git-blame-ignore-revs` once committed.

Reviewed By: ldionne, var-const, #libc

Spies: jloser, libcxx-commits, arichardson, arphaman, wenlei

Differential Revision: https://reviews.llvm.org/D143962

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[libc++] Enable radability-identifier-naming for local variables and fix any problems

Fixes #60658

Reviewed By: Mordante, #libc

Spies: aheejin, sstefan1, libcxx-commits

Differential Revision: htt

[libc++] Enable radability-identifier-naming for local variables and fix any problems

Fixes #60658

Reviewed By: Mordante, #libc

Spies: aheejin, sstefan1, libcxx-commits

Differential Revision: https://reviews.llvm.org/D143737

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[libc++] Suppress -Wctad-maybe-unsupported on types w/o deduction guides

There are a handful of standard library types that are intended
to support CTAD but don't need any explicit deduction guides

[libc++] Suppress -Wctad-maybe-unsupported on types w/o deduction guides

There are a handful of standard library types that are intended
to support CTAD but don't need any explicit deduction guides to
do so.

This patch adds a dummy deduction guide to those types to suppress
-Wctad-maybe-unsupported (which gets emitted in user code).

This is a re-application of the original patch by Eric Fiselier in
fcd549a7d828 which had been reverted due to reasons lost at this point.
I also added the macro to a few more types. Reviving this patch was
prompted by the discussion on https://llvm.org/D133425.

Differential Revision: https://reviews.llvm.org/D133535

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[libc++] Make the naming of private member variables consistent and enforce it through readability-identifier-naming

Reviewed By: ldionne, #libc

Spies: aheejin, sstefan1, libcxx-commits

Differenti

[libc++] Make the naming of private member variables consistent and enforce it through readability-identifier-naming

Reviewed By: ldionne, #libc

Spies: aheejin, sstefan1, libcxx-commits

Differential Revision: https://reviews.llvm.org/D129386

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[libc++] Make parameter names consistent and enforce the naming style using readability-identifier-naming

Ensure that parameter names have the style `__lower_case`

Reviewed By: ldionne, #libc

Spie

[libc++] Make parameter names consistent and enforce the naming style using readability-identifier-naming

Ensure that parameter names have the style `__lower_case`

Reviewed By: ldionne, #libc

Spies: aheejin, sstefan1, libcxx-commits, miyuki

Differential Revision: https://reviews.llvm.org/D129051

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