On Mon, Oct 17, 2022 at 5:11 AM Mark Wielaard <mark@klomp.org> wrote:
>
> Hi,
>
> This seems to work and is probably OK.  But do you know when/what the
> __ prefix versions are defined and when/what defines the non-prefixed
> versions?
>

__BYTE_ORDER__ is a predefined macro by gcc/clang,

BYTE_ORDER is defined in <endian.h>

--
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo