[libc++] Put _LIBCPP_NODEBUG on all internal aliases (#118710)

This significantly reduces the amount of debug information generated
for codebases using libc++, without hurting the debugging experie

[libc++] Put _LIBCPP_NODEBUG on all internal aliases (#118710)

This significantly reduces the amount of debug information generated
for codebases using libc++, without hurting the debugging experience.

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[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++] Fix improper static_cast in std::deque and __split_buffer (#119106)

This PR addresses the improper use of `static_cast` to `size_t` where
`size_type` is intended. Although the `size_type`

[libc++] Fix improper static_cast in std::deque and __split_buffer (#119106)

This PR addresses the improper use of `static_cast` to `size_t` where
`size_type` is intended. Although the `size_type` member type of STL
containers is usually a synonym of `std::size_t`, there is no guarantee
that they are always equivalent. The C++ standard does not mandate this
equivalence.

In libc++'s implementations of `std::deque`, `std::vector`, and
`__split_buffer`, the `size_type` member type is defined as
`std::allocator_traits<allocator_type>::size_type`, which is either
`allocator_type::size_type` if available or
`std::make_unsigned<difference_type>::type`. While it is true for
`std::allocator` that the `size_type` member type is `std::size_t`, for
user-defined allocator types, they may mismatch. This justifies the need
to replace `static_cast<size_t>` with `static_cast<size_type>` in this
PR.

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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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Unify naming of internal pointer members in std::vector and std::__split_buffer (#115517)

Related to PR #114423, this PR proposes to unify the naming of the
internal pointer members in `std::vector

Unify naming of internal pointer members in std::vector and std::__split_buffer (#115517)

Related to PR #114423, this PR proposes to unify the naming of the
internal pointer members in `std::vector` and `std::__split_buffer` for
consistency and clarity.

Both `std::vector` and `std::__split_buffer` originally used a
`__compressed_pair<pointer, allocator_type>` member named `__end_cap_`
to store an internal capacity pointer and an allocator. However,
inconsistent naming changes have been made in both classes:
- `std::vector` now uses `__cap_` and `__alloc_` for its internal
pointer and allocator members.
- In contrast, `std::__split_buffer` retains the name `__end_cap_` for
the capacity pointer, along with `__alloc_`.

This inconsistency between the names `__cap_` and `__end_cap_` has
caused confusions (especially to myself when I was working on both
classes). I suggest unifying these names by renaming `__end_cap_` to
`__cap_` in `std::__split_buffer`.

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

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

[libc++][NFC] Simplify __split_buffer a bit (#114224)

This is possible since we're not using `__compressed_pair` anymore.

[libc++] Refactor __split_buffer to eliminate code duplication (#114138)

This PR refactors the `__split_buffer` class to eliminate code
duplication in the `push_back` and `push_front` member functi

[libc++] Refactor __split_buffer to eliminate code duplication (#114138)

This PR refactors the `__split_buffer` class to eliminate code
duplication in the `push_back` and `push_front` member functions.

**Motivation:**
The lvalue and rvalue reference overloads of `push_back` share identical
logic, which coincides with that of `emplace_back`. Similarly, the
overloads of `push_front` also share identical logic but lack an
`emplace_front` member function, leading to an inconsistency. These
identical internal logics lead to significant code duplication, making
future maintenance more difficult.

**Summary of Refactor:**
This PR reduces code redundancy by:
1. Modifying both overloads of `push_back` to call `emplace_back`.
2. Introducing a new `emplace_front` member function that encapsulates
the logic of `push_front`, allowing both overloads of `push_front` to
call it (The addition of `emplace_front` also avoids the inconsistency
regarding the absence of `emplace_front`).

The refactoring results in reduced code duplication, improved
maintainability, and enhanced readability.

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[libc++] Add container_traits (prework for `std::flat_map`) (#109578)

This PR is extracted from
https://github.com/llvm/llvm-project/pull/98643, as per code review
request
https://github.com/llvm

[libc++] Add container_traits (prework for `std::flat_map`) (#109578)

This PR is extracted from
https://github.com/llvm/llvm-project/pull/98643, as per code review
request
https://github.com/llvm/llvm-project/pull/98643#discussion_r1768967793

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[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++][modules] Fix missing and incorrect includes (#108850)

This patch adds a large number of missing includes in the libc++ headers
and the test suite. Those were found as part of the effort to

[libc++][modules] Fix missing and incorrect includes (#108850)

This patch adds a large number of missing includes in the libc++ headers
and the test suite. Those were found as part of the effort to move
towards a mostly monolithic top-level std module.

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[libc++] Replace `__compressed_pair` with `[[no_unique_address]]` (#76756)

This significantly simplifies the code, improves compile times and
improves the object layout of types using `__compressed_

[libc++] Replace `__compressed_pair` with `[[no_unique_address]]` (#76756)

This significantly simplifies the code, improves compile times and
improves the object layout of types using `__compressed_pair` in the
unstable ABI. The only downside is that this is extremely ABI sensitive
and pedantically breaks the ABI for empty final types, since the address
of the subobject may change. The ABI of the whole object should not be
affected.

Fixes #91266
Fixes #93069

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[libc++][NFC] Use [[__nodiscard__]] unconditionally (#80454)

`__has_cpp_attribute(__nodiscard__)` is always true now, so we might as
well replace `_LIBCPP_NODISCARD`. It's one less macro that can r

[libc++][NFC] Use [[__nodiscard__]] unconditionally (#80454)

`__has_cpp_attribute(__nodiscard__)` is always true now, so we might as
well replace `_LIBCPP_NODISCARD`. It's one less macro that can result in
bad diagnostics.

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[libc++][spaceship] Removes unneeded relational operators. (#100441)

This is a followup of https://github.com/llvm/llvm-project/pull/99343.
Since that patch was quite late in the LLVM-19 release cy

[libc++][spaceship] Removes unneeded relational operators. (#100441)

This is a followup of https://github.com/llvm/llvm-project/pull/99343.
Since that patch was quite late in the LLVM-19 release cycle some of the
unneeded relational operator were not removed in C++20.

This removes them and gives the change a bit more "baking" time, just in
case there are issues with this change in user code. This change is
intended to be an NFC.

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[libc++][spaceship] Implements X::iterator container requirements. (#99343)

This implements the requirements for the container iterator requirements
for array, deque, vector, and `vector<bool>`.

[libc++][spaceship] Implements X::iterator container requirements. (#99343)

This implements the requirements for the container iterator requirements
for array, deque, vector, and `vector<bool>`.

Implements:
- LWG3352 strong_equality isn't a thing

Implements parts of:
- P1614R2 The Mothership has Landed

Fixes: https://github.com/llvm/llvm-project/issues/62486

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[libc++] Restore `__synth_three_way` lambda (#90398)

Restore `__synth_three_way` lambda to match the Standard.
GH-57222 is done, restoring the Standard wording implementation should
be possible.

[libc++] Restore `__synth_three_way` lambda (#90398)

Restore `__synth_three_way` lambda to match the Standard.
GH-57222 is done, restoring the Standard wording implementation should
be possible.


https://github.com/llvm/llvm-project/blob/df28d4412c1d21b0e18896c92ac77d2fac7729f1/libcxx/include/__compare/synth_three_way.h#L28

According to comment
https://github.com/llvm/llvm-project/issues/59513#issuecomment-2068338762,
GH-59513 is not a blocker.

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

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[libc++] Move allocator assertion into allocator_traits (#94750)

There is code duplication in all containers that static_assert the
allocator matches the allocator requirements in the spec. This ch

[libc++] Move allocator assertion into allocator_traits (#94750)

There is code duplication in all containers that static_assert the
allocator matches the allocator requirements in the spec. This check can
be moved into a more centralised place.

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[libc++][NFC] Replace _NOEXCEPT and _LIBCPP_CONSTEXPR macros with the keywords in C++11 code (#96387)

[libc++] Refactor<__type_traits/is_swappable.h> (#86822)

This changes the `is_swappable` implementation to use variable templates
first and basing the class templates on that. This avoids instantia

[libc++] Refactor<__type_traits/is_swappable.h> (#86822)

This changes the `is_swappable` implementation to use variable templates
first and basing the class templates on that. This avoids instantiating
them when the `_v` versions are used, which are generally less resource
intensive.

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[libc++][NFC] Remove unnecessary parens in static_asserts (#95605)

These were required a long time ago due to `static_assert` not actually
being available in C++03. Now `static_assert` is simply ma

[libc++][NFC] Remove unnecessary parens in static_asserts (#95605)

These were required a long time ago due to `static_assert` not actually
being available in C++03. Now `static_assert` is simply mapped to
`_Static_assert` in C++03, making the additional parens unnecessary.

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[libc++] Mark more types as trivially relocatable (#89724)

Co-authored-by: Louis Dionne <ldionne.2@gmail.com>

[libc++][NFC] Fix typo

[libc++] Make the __availability header a sub-header of __config (#93083)

In essence, this header has always been related to configuration of
the library but we didn't want to put it inside <__conf

[libc++] Make the __availability header a sub-header of __config (#93083)

In essence, this header has always been related to configuration of
the library but we didn't want to put it inside <__config> due to
complexity reasons. Now that we have sub-headers in <__config>, we
can move <__availability> to it and stop including it everywhere since
we already obtain the required macros via <__config>.

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[libc++] Remove _LIBCPP_DISABLE_NODISCARD_EXTENSIONS and refactor the tests (#87094)

This also adds a few tests that were missing.

[libc++][NFC] Move basic ASan annotation functions into a utility header (#87220)