[libc++][CI] Updates GCC to version 12.

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

Differential Revision: https://reviews.llvm.org/D126667

[libc++][format] Implement format-string.

Implements the compile-time checking of the formatting arguments.

Completes:
- P2216 std::format improvements

Reviewed By: #libc, ldionne

Differential Re

[libc++][format] Implement format-string.

Implements the compile-time checking of the formatting arguments.

Completes:
- P2216 std::format improvements

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D121530

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[NFC][libc++][format] Prepare unit tests.

Before implementing P2216's format-string adjust the unit tests.
After P2216 the format* functions require a compile-time string literal.
This changes prepa

[NFC][libc++][format] Prepare unit tests.

Before implementing P2216's format-string adjust the unit tests.
After P2216 the format* functions require a compile-time string literal.
This changes prepares the tests.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D122534

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[libc++] Replace _LIBCPP_HAS_NO_CONCEPTS with _LIBCPP_STD_VER > 17. NFCI.

All supported compilers that support C++20 now support concepts. So, remove
`_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBC

[libc++] Replace _LIBCPP_HAS_NO_CONCEPTS with _LIBCPP_STD_VER > 17. NFCI.

All supported compilers that support C++20 now support concepts. So, remove
`_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in
the tests, remove `// UNSUPPORTED: libcpp-no-concepts`.

Differential Revision: https://reviews.llvm.org/D121528

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[libc++] Enable format_to and vformat_to tests even outside of Debug mode

These tests don't seem specific to the debug mode, so it makes sense to
run them even when the debug mode is disabled. When

[libc++] Enable format_to and vformat_to tests even outside of Debug mode

These tests don't seem specific to the debug mode, so it makes sense to
run them even when the debug mode is disabled. When we run with the debug
mode enabled, we'll get the out-of-bounds checking that this test seems
to be concerned with.

Differential Revision: https://reviews.llvm.org/D121241

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[libc++][format[[nfc] Use string_view in tests.

This change is a preparation for adapting the tests for
P2216 std::format improvements

Reviewed By: #libc, Quuxplusone, ldionne

Differential Revis

[libc++][format[[nfc] Use string_view in tests.

This change is a preparation for adapting the tests for
P2216 std::format improvements

Reviewed By: #libc, Quuxplusone, ldionne

Differential Revision: https://reviews.llvm.org/D118717

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[libc++][nfc] Update formatting of some tests.

These tests were formatted with older clang-format settings, this
updates them to the current settings.

In order to implement P2216 a lot of changes t

[libc++][nfc] Update formatting of some tests.

These tests were formatted with older clang-format settings, this
updates them to the current settings.

In order to implement P2216 a lot of changes to these tests are
required. This makes it easier to review those patches.

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[libc++] Add an option to disable wide character support in libc++

Some embedded platforms do not wish to support the C library functionality
for handling wchar_t because they have no use for it. It

[libc++] Add an option to disable wide character support in libc++

Some embedded platforms do not wish to support the C library functionality
for handling wchar_t because they have no use for it. It makes sense for
libc++ to work properly on those platforms, so this commit adds a carve-out
of functionality for wchar_t.

Unfortunately, unlike some other carve-outs (e.g. random device), this
patch touches several parts of the library. However, despite the wide
impact of this patch, I still think it is important to support this
configuration since it makes it much simpler to port libc++ to some
embedded platforms.

Differential Revision: https://reviews.llvm.org/D111265

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[libc++][format] Adds bool formatter.

Implements the formatter for Boolean types.
[format.formatter.spec]/2.3
For each charT, for each cv-unqualified arithmetic type ArithmeticT other
than char, wch

[libc++][format] Adds bool formatter.

Implements the formatter for Boolean types.
[format.formatter.spec]/2.3
For each charT, for each cv-unqualified arithmetic type ArithmeticT other
than char, wchar_t, char8_t, char16_t, or char32_t, a specialization
```
template<> struct formatter<ArithmeticT, charT>;
```
This removes the stub implemented in D96664.

Implements parts of:
- P0645 Text Formatting
- P1652 Printf corner cases in std::format

Completes:
- P1868 width: clarifying units of width and precision in std::format

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D103670

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[libc++][format] Implement formatters.

This implements the initial version of the `std::formatter` class and its specializations. It also implements the following formatting functions:
- `format`
-

[libc++][format] Implement formatters.

This implements the initial version of the `std::formatter` class and its specializations. It also implements the following formatting functions:
- `format`
- `vformat`
- `format_to`
- `vformat_to`
- `format_to_n`
- `formatted_size`

All functions have a `char` and `wchar_t` version. Parsing the format-spec and
using the parsed format-spec hasn't been implemented. The code isn't optimized,
neither for speed, nor for size.

The goal is to have the rudimentary basics working, which can be used as a
basis to improve upon. The formatters used in this commit are simple stubs that
will be replaced by real formatters in later commits.

The formatters that are slated to be replaced in this patch series don't have
an availability macro to avoid merge conflicts.

Note the formatter for `bool` uses `0` and `1` instead of "false" and
"true". This will be fixed when the stub is replaced with a real
formatter.

Implements parts of:
- P0645 Text Formatting

Completes:
- LWG3539 format_to must not copy models of output_iterator<const charT&>

Reviewed By: ldionne, #libc, vitaut

Differential Revision: https://reviews.llvm.org/D96664

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