Enabling Traps on Mac G5

Hello,

I'm using CMUCL 19c on a PowerMac G5, and I keep having the
same problem when trying to enable traps.

After starting CMUCL, I type 

(set-floating-point-modes :traps '(:underflow :overflow
:inexact :invalid))

I then type 

(get-floating-point-modes)

and I see 

(:TRAPS NIL :ROUNDING-MODE :NEAREST :CURRENT-EXCEPTIONS
(:INEXACT)
 :ACCRUED-EXCEPTIONS (:INEXACT) :FAST-MODE NIL)

This is consistent.  The reported list of traps is always
nil.  I tried setting the traps in a .cmucl-init file, but
that didn't work either.  The code works as expected in the
Linux version, so I'm starting to think that floating point
traps don't work on the G5 architecture (or powerpc in
general).  Is this the case?

Will

>>>>> "Will" == Will 
<perpetualstranger-clispyahoo.com> writes:

    Will> This is consistent.  The reported list of traps
is always
    Will> nil.  I tried setting the traps in a
.cmucl-init file, but
    Will> that didn't work either.  The code works as
expected in the
    Will> Linux version, so I'm starting to think that
floating point
    Will> traps don't work on the G5 architecture (or
powerpc in
    Will> general).  Is this the case?

Yes.  It's a known problem.  I don't know what the solution
is.

Ray