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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110798

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to miles from comment #0)
>     typedef char ch_t;
>         assert( sizeof(unsigned char) =3D=3D 1); //right
>         assert( sizeof(ch_t) =3D=3D 1 ); //right
>         assert( sizeof(unsigned ch_t) =3D=3D 1); //the only one right

This is not valid C++, you can't use 'signed' and 'unsigned' with typedefs.

Use std::make_unsigned_t<ch_t>=