libc++: silence -Wnontrivial-memaccess warning with newer clang

Apply part of LLVM commit 71315698c91d0cda054b903da0594ca6f072c350 to
silence the -Wnontrivial-memaccess warning that is triggered any

libc++: silence -Wnontrivial-memaccess warning with newer clang

Apply part of LLVM commit 71315698c91d0cda054b903da0594ca6f072c350 to
silence the -Wnontrivial-memaccess warning that is triggered any time
this function is instantiated by user code. This fixes another
buildworld failure with Clang HEAD.

Original commit message:
[clang] Warn about memset/memcpy to NonTriviallyCopyable types (#111434)
This implements a warning that's similar to what GCC does in that
context: both memcpy and memset require their first and second operand
to be trivially copyable, let's warn if that's not the case.

Reviewed by: emaste, dim
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D52534

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libc++: Fix deprecation warnings with latest clang

Latest clang has become more strict in diagnosing deprecated decls, so
pull in LLVM commit 9feac2cbd0d80927ce9a8b4c3e810d2b81802d55.

Original comm

libc++: Fix deprecation warnings with latest clang

Latest clang has become more strict in diagnosing deprecated decls, so
pull in LLVM commit 9feac2cbd0d80927ce9a8b4c3e810d2b81802d55.

Original commit message:
[libc++] Improve deprecated diagnostic guards.

Recent Clang-21 builds improved the deprecated diagnotics. This
uncovered missing guards in libc++ internally.

Reviewed by: dim
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D52531

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libc++: avoid use of deprecated __reference_binds_to_temporary

This was removed in upstream libc++ in commit
437ad06f762ab07d89badecdd20627db200b98d3, but as this does not apply
cleanly to the curre

libc++: avoid use of deprecated __reference_binds_to_temporary

This was removed in upstream libc++ in commit
437ad06f762ab07d89badecdd20627db200b98d3, but as this does not apply
cleanly to the current repository, I am applying the equivalent change
in a minimally invasive way. This is needed to build with latest clang
HEAD as of today.

Reviewed by: dim
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D52530

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libc++: avoid use of deprecated builtin

This pulls in LLVM commit accfbd4cb327411ad66c0109ba1841482b871967 to
avoid the use of __libcpp_is_trivially_relocatable.
This fixes building FreeBSD libc++ w

libc++: avoid use of deprecated builtin

This pulls in LLVM commit accfbd4cb327411ad66c0109ba1841482b871967 to
avoid the use of __libcpp_is_trivially_relocatable.
This fixes building FreeBSD libc++ with clang HEAD as of today.

Original commit message:
[libc++] Replace __is_trivially_relocatable by is_trivially_copyable (#124970)

The __is_trivially_relocatable builtin has semantics that do not
correspond to any current or future notion of trivial relocation.
Furthermore, it currently leads to incorrect optimizations for some
types on supported compilers:
- Clang on Windows where types with non-trivial destructors get
incorrectly optimized
- AppleClang where types with non-trivial move constructors get
incorrectly optimized

Until there is an agreed upon and bugfree implementation of what it
means to be trivially relocatable, it is safer to simply use trivially
copyable instead. This doesn't leave a lot of types behind and is
definitely correct.

Reviewed by: dim
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D52529

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