On 18/06/19 12:39 +0100, Jonathan Wakely wrote:
* include/c_global/cstddef (std::byte): Perform arithmetic operations in unsigned int to avoid promotion (LWG 2950).Tested x86_64-linux, committed to trunk.
I don't see any great need to backport this, because I don't think the compiler or UBSan cares that the old definitions were technically undefined.