standards on SIGFPE for divide by zero?

[Jeff Rizzo <riz%tastylime.net@localhost>]

I'm currently slogging through various tests which are failing on 
macppc, and I came across the two that involve SIGFPE being thrown when 
detecting integer and floating point divide-by-zero.  NetBSD/macppc 
(and, I assume, all the NetBSD powerpc ports) don't signal on 
divide-by-zero, and so these tests fail.  
(/usr/src/tests/lib/libc/gen/t_siginfo.c is the source file:  the 
sigfpe_flt and sigfpe_int tests, respectively)

My question is:  what do the relevant standards say about this?  Is it 
required to SIGFPE?  If it's required, I'll file a PR against 
port-powerpc and mark the tests expected-fail on ppc.  If not, then I'll 
skip them on ppc.

Thanks!
+j