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diff --git a/contrib/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h b/contrib/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
--- a/contrib/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
+++ b/contrib/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
@@ -642,7 +642,8 @@
__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));
}
}

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