Re: Portability fix in kern_ntptime.c

[David Holland <dholland-tech%netbsd.org@localhost>]

On Wed, Jun 05, 2019 at 05:38:18PM -0500, David Young wrote:
 > > (and perhaps more) - if one of those is a shift of a negative number,
 > > the others potentially are as well (not that shifts of negative numbers
 > > bother me at all if the code author understood what is happening, which
 > > I suspect that they did here.)
 > 
 > Unfortunately, if "undefined behavior" (UB) is invoked, you simply
 > cannot claim to understand what is happening, because C11-compliant
 > compilers have a lot of leeway in what code they generate when behavior
 > is undefined.

...and in particular they deliberately take that leeway in knowing
violation of the principle of least surprise.

-- 
David A. Holland
dholland%netbsd.org@localhost