NetBSD 6.1.5 doesn't have ldexpl in math.h

[Eric S. Raymond]

Matthew Selsky via devel <devel at ntpsec.org>:
> ldexpl() was added in NetBSD 7 (released Sept 2015).  NetBSD 6 was released in
> Oct 2012 and last had a point release in Sept 2014).  NetBSD 6 is still
> supported by upstream per https://www.netbsd.org/releases/formal.html#history
> 
> NetBSD 8 is in beta and no release date has been announced yet.  I would expect
> NetBSD 6 support to be dropped when NetBSD 8 comes out.
> 
> Do we need to support NetBSD 6 given it's age and lack of complete c99 support?

I'm going to pull the lever for "no".

The point of choosing C99/POSIX-2001.1 as our support baseline was to
have a cutoff point that is (a) useful for drastically cutting our
complexity-related burdens, and (b) easy to explain and justify - it is
a 16-year-old pair of standards, after all.

I recently threw pre-10.12 versions of Mac OS X off the island for
botching the time primitives.  I can think of no good reason for
NetBSD 6 to get an indulgence.

I think being hard-line about that policy choice has been successful
and we should stick to it.

Technical note: Our OS baseline is not quite POSIX-2001.1 - for rather
obvious reasons we require the time primitives from the 2008 revision
as well, and adjtime(2).
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