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Revision tags: llvmorg-21-init, llvmorg-19.1.7
# b9a2658a 21-Dec-2024 Nikolas Klauser <nikolasklauser@berlin.de>

[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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Revision tags: llvmorg-19.1.6, llvmorg-19.1.5, llvmorg-19.1.4, llvmorg-19.1.3, llvmorg-19.1.2, llvmorg-19.1.1, llvmorg-19.1.0, llvmorg-19.1.0-rc4, llvmorg-19.1.0-rc3, llvmorg-19.1.0-rc2, llvmorg-19.1.0-rc1, llvmorg-20-init, llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4, llvmorg-17.0.3, llvmorg-17.0.2
# 9bb9ec38 28-Sep-2023 Louis Dionne <ldionne.2@gmail.com>

[libc++][NFC] Simplify checks for static assertions in .verify.cpp tests (#67559)

We don't neeed to handle both spellings anymore since we don't support
Clang 15 anymore.


Revision tags: llvmorg-17.0.1, llvmorg-17.0.0, llvmorg-17.0.0-rc4, llvmorg-17.0.0-rc3, llvmorg-17.0.0-rc2, llvmorg-17.0.0-rc1, llvmorg-18-init
# dc71a77d 16-Jun-2023 Louis Dionne <ldionne.2@gmail.com>

[libc++][NFC] Move several .fail.cpp tests to .verify.cpp

A few tests were also straightforward to translate to SFINAE tests
instead, so in a few cases I did that and removed the .fail.cpp test
enti

[libc++][NFC] Move several .fail.cpp tests to .verify.cpp

A few tests were also straightforward to translate to SFINAE tests
instead, so in a few cases I did that and removed the .fail.cpp test
entirely.

Differential Revision: https://reviews.llvm.org/D153149

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