[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++] Granularize the <new> header (#119270)

This disentangles the code which previously had a mix of many #ifdefs, a
non-versioned namespace and a versioned namespace. It also makes it
clearer

[libc++] Granularize the <new> header (#119270)

This disentangles the code which previously had a mix of many #ifdefs, a
non-versioned namespace and a versioned namespace. It also makes it
clearer which parts of <new> are implemented on Windows by including <new.h>.

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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++] Remove transitive includes from empty headers (#116295)

This removes transitive includes that are only in a header that is empty
in a given C++ version.

[libc++] Granularize <cstddef> includes (#108696)

[libcxx][libc] Hand in Hand PoC with from_chars (#91651)

Implements std::from_chars for float and double.

The implementation uses LLVM-libc to do the real parsing. Since this is
the first time libc

[libcxx][libc] Hand in Hand PoC with from_chars (#91651)

Implements std::from_chars for float and double.

The implementation uses LLVM-libc to do the real parsing. Since this is
the first time libc++
uses LLVM-libc there is a bit of additional infrastructure code. The
patch is based on the
[RFC] Project Hand In Hand (LLVM-libc/libc++ code sharing)

https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701

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[libc++][RFC] Only include what is required by-version in the umbrella headers (#83740)

This is a relatively low cost way of reducing the include sizes in older
language modes compared to the effec

[libc++][RFC] Only include what is required by-version in the umbrella headers (#83740)

This is a relatively low cost way of reducing the include sizes in older
language modes compared to the effect. For example, in C++14 mode the
include time of `<algorithm>` is reduced from 198ms to 127ms.

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[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++] Remove a few transitive includes (#70553)

[libc++][charconv] Adds operator bool.

Implements
- P2497R0 Testing for success or failure of <charconv> functions

Depends on D153192

Reviewed By: #libc, ldionne

Differential Revision: https://re

[libc++][charconv] Adds operator bool.

Implements
- P2497R0 Testing for success or failure of <charconv> functions

Depends on D153192

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D153199

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[libc++] Remove the legacy debug mode.

See https://discourse.llvm.org/t/rfc-removing-the-legacy-debug-mode-from-libc/71026

Reviewed By: #libc, Mordante, ldionne

Differential Revision: https://revi

[libc++] Remove the legacy debug mode.

See https://discourse.llvm.org/t/rfc-removing-the-legacy-debug-mode-from-libc/71026

Reviewed By: #libc, Mordante, ldionne

Differential Revision: https://reviews.llvm.org/D153672

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[libc++] Move __errc to __system_error/errc.h

This file was added before we started granularizing the headers, but is essentially just a granularized header. This moves the header to the correct pla

[libc++] Move __errc to __system_error/errc.h

This file was added before we started granularizing the headers, but is essentially just a granularized header. This moves the header to the correct place.

Reviewed By: #libc, EricWF

Spies: libcxx-commits, arichardson, mikhail.ramalho

Differential Revision: https://reviews.llvm.org/D146395

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[libc++] Remove <cstdlib> includes

We changed the `abort` calls when trying to throw exceptions in `-fno-exceptions` mode to `__verbose_abort` calls, which removes the dependency in most files.

Rev

[libc++] Remove <cstdlib> includes

We changed the `abort` calls when trying to throw exceptions in `-fno-exceptions` mode to `__verbose_abort` calls, which removes the dependency in most files.

Reviewed By: ldionne, #libc

Spies: dim, emaste, mikhail.ramalho, smeenai, libcxx-commits

Differential Revision: https://reviews.llvm.org/D146076

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[libc++][charconv] Granularizes the header.

Having the header granularized makes it possible to remove the
dependency on this header in <format>. This <format> header gets
included in more headers d

[libc++][charconv] Granularizes the header.

Having the header granularized makes it possible to remove the
dependency on this header in <format>. This <format> header gets
included in more headers due to more usage of std::formatter in the
library. This should reduce the number of transitive includes.

Note formatting the new headers will be done in a followup patch.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D145590

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[libc++] Granularize <type_traits> includes

Reviewed By: ldionne, #libc, #libc_abi

Spies: #libc_vendors, smeenai, libcxx-commits

Differential Revision: https://reviews.llvm.org/D145320

[libc++] Move constexpr <cstring> functions into their own headers and remove unused <cstring> includes

Reviewed By: ldionne, Mordante, #libc, #libc_abi

Spies: libcxx-commits

Differential Revision

[libc++] Move constexpr <cstring> functions into their own headers and remove unused <cstring> includes

Reviewed By: ldionne, Mordante, #libc, #libc_abi

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D143329

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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++][NFC] Remove FP from_chars from the <charconv> synopsis since we don't implement it yet

[libc++] Granularize <bit> and remove <__bits>

Reviewed By: Mordante, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D141225

[libc++] Add custom clang-tidy checks

Reviewed By: #libc, ldionne

Spies: jwakely, beanz, smeenai, cfe-commits, tschuett, avogelsgesang, Mordante, sstefan1, libcxx-commits, ldionne, mgorny, arichard

[libc++] Add custom clang-tidy checks

Reviewed By: #libc, ldionne

Spies: jwakely, beanz, smeenai, cfe-commits, tschuett, avogelsgesang, Mordante, sstefan1, libcxx-commits, ldionne, mgorny, arichardson, miyuki

Differential Revision: https://reviews.llvm.org/D131963

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[libc++][clang-tidy] Enable readability-simplify-boolean-expr

Reviewed By: ldionne, #libc

Spies: Eugene.Zelenko, aheejin, libcxx-commits, xazax.hun

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

[libc++][clang-tidy] Enable readability-simplify-boolean-expr

Reviewed By: ldionne, #libc

Spies: Eugene.Zelenko, aheejin, libcxx-commits, xazax.hun

Differential Revision: https://reviews.llvm.org/D137804

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[libc++] Granularize <concept> includes

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D137283

[libc++] Implements constexpr <charconv>.

Implements:
- P2291R3 Add Constexpr Modifiers to Functions to_chars and from_chars for
Integral Types in <charconv> Header

Reviewed By: #libc, ldionne

D

[libc++] Implements constexpr <charconv>.

Implements:
- P2291R3 Add Constexpr Modifiers to Functions to_chars and from_chars for
Integral Types in <charconv> Header

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D131317

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[libc++] Make charconv require C++17 or later.

Implementing the paper
P2291R3 Add Constexpr Modifiers to Functions to_chars and from_chars for
Integral Types in <charconv> Header

Gives issu

[libc++] Make charconv require C++17 or later.

Implementing the paper
P2291R3 Add Constexpr Modifiers to Functions to_chars and from_chars for
Integral Types in <charconv> Header

Gives issues in language versions prior to C++17. As suggested in
D131855 disable the code prior to C++17. This removes libc++'s
extension.

Reviewed By: ldionne, #libc_vendors, #libc, philnik

Differential Revision: https://reviews.llvm.org/D133216

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[libc++] Remove MSVC code

It's been one and a half months now and nobody said anything, so I guess this code can be removed.

Reviewed By: ldionne, #libc

Spies: Mordante, libcxx-commits, mgorny, ms

[libc++] Remove MSVC code

It's been one and a half months now and nobody said anything, so I guess this code can be removed.

Reviewed By: ldionne, #libc

Spies: Mordante, libcxx-commits, mgorny, mstorsjo

Differential Revision: https://reviews.llvm.org/D132943

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