Re: Building current...

[Paul Koning <paulkoning%comcast.net@localhost>]

> On Dec 1, 2015, at 6:29 PM, Johnny Billquist <bqt%softjar.se@localhost> wrote:
> 
> After some hiatus, "my" VAX 8650 is back among the living, so I decided to try and build current again.
> ...
> Now the "analysis". It appears that programs call log10() with an argument of 0, and consider this to be normal.
> Unfortunately, this is one of those places where the VAX not doing IEEE FP bites us. The IEEE log10() of 0 will return -inf, and happily chug on. The VAX log10() of 0 will cause an illegal instruction trap.
> 
> I suspect the other programs crashing might be because of the same reason. The question is - what should we do? I'm tempted to just change the code for log() to return 0, or possible -MAX_whatever and not trap. Opinions?

Why not simply fix the bug?  log(0) is invalid.  It's probably an initialization error, where log() is used for some magic timekeeping math that is only valid the second time around.

	paul