[tz] Question about bug seen in OpenBSD and FreeBSD related to tzname

[Garrett Wollman]

On November 22, 2019 9:30:52 PM EST, Paul Eggert <eggert at cs.ucla.edu> wrote:

>I see now that POSIX marks 'daylight' and 'timezone' with "XSI",
>meaning 
>it's optional and present only if the X/Open Systems Interfaces option 
>is supported, so perhaps tzcode should have a different macro for 
>identifiers that are XSI rather than core POSIX.

That is in fact the position FreeBSD has long taken. We implement the historic BSD timezone(3) function.

-GAWollman