Use !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) to determine if lib…
#1680
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…c++ supports aligned allocations. The ASIO uses `_LIBCPP_HAS_ALIGNED_ALLOC`` to learn if libc++ defines `std::aligned_new`. I didn't manage to find this define in llvm codebase. I found these though: - [_LIBCPP_HAS_NO_ALIGNED_ALLOCATION](https://github.com/llvm/llvm-project/blob/dbd197118db597970a5a9c5688c5e0bb01948ebb/libcxx/include/__config#L642C13-L642C46) is defined when either library or compiler lack support. I didn't trace when it was introduced [but 2018 version defines it](llvm/llvm-project@53ac177) - [_LIBCPP_HAS_ALIGNED_ALLOCATION](https://github.com/llvm/llvm-project/blob/1c094a1ce2ef15b5855b11aa85dbb2f1eea54f13/libcxx/include/__config#L667-L671) is inverse of `_LIBCPP_HAS_NO_ALIGNED_ALLOCATION`` but only available [since Oct 12,2024](llvm/llvm-project@ba87515#diff-720de38e87ca590a6946574a5c75c382720f1784dd63ba60deb0bb54bd827c43). I've chosen `_LIBCPP_HAS_NO_ALIGNED_ALLOCATION` to cover more versions.
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…c++ supports aligned allocations.
The ASIO uses
_LIBCPP_HAS_ALIGNED_ALLOCto learn if libc++ definesstd::aligned_new.I didn't manage to find this define in llvm codebase.
I found these though:
I've chosen
_LIBCPP_HAS_NO_ALIGNED_ALLOCATIONto cover more versions.Closes: #1678