https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67093
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> --- Yes, that's the latest POSIX spec. The term "should" is defined in section 1.5 Terminology as: ... For an application, describes a feature or behavior that is recommended programming practice for optimum portability. (http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap01.html#tag_01_05_06)
