Sometimes (*cough* linking GNU new (nothrow) still brings in a bunch of exception-handling crap *cough*) you just need an easy malloc'd buffer with automatic lifetime management.

noexcept_auto_buf.cpp

template<class T>
using auto_buf = std::unique_ptr<T[], void(&)(void*) noexcept>;

template<class T>
auto_buf<T> make_auto_buf(std::size_t n) noexcept
{
    return auto_buf<T>(static_cast<T*>(std::malloc(n * sizeof(T))), std::free);
}