Why is -fno-strict-aliasing needed for gsl::byte?

[Jonathan Wakely]

The project README says:

Note: For gsl::byte to work correctly with Clang and GCC you might have to use the -fno-strict-aliasing compiler option.

Please explain this clearly. Which versions are affected? Why is it needed? Is it only for versions of those compilers that don't support the __may_alias__ attribute? Only when gsl::byte is defined by GSL rather than as an alias for std::byte? Something else?

Currently this says to me "don't use gsl::byte".

[Herb Sutter]

Maintainers' call: We think this is a stray/stale comment. Removing. Thanks!