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

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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

(cherry picked from commit 34a006eaa3)
This commit is contained in:
Alex Richardson 2025-09-15 15:14:18 -07:00 • committed by Ed Maste
parent 703c98dc6e
commit ca149d75e9
1 changed files with 2 additions and 1 deletions
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3
contrib/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
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@ -642,7 +642,8 @@ __uninitialized_allocator_relocate(_Alloc& __alloc, _Tp* __first, _Tp* __last, _
__guard.__complete();
std::__allocator_destroy(__alloc, __first, __last);
} else {
__builtin_memcpy(const_cast<__remove_const_t<_Tp>*>(__result), __first, sizeof(_Tp) * (__last - __first));
// Casting to void* to suppress clang complaining that this is technically UB.
__builtin_memcpy(static_cast<void*>(const_cast<__remove_const_t<_Tp>*>(__result)), __first, sizeof(_Tp) * (__last - __first));
}
}