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I don't have the directory /opt/SUNWspro.
I did a:  find /opt -name '*sunmath*' -print
and got nothing.  Also looked for *ieee*,
nm /usr/lib/lib*.a also yields nothing.

But there is fpsetmask() now.  And there's 
#include <floatingpoint.h> or <sys/ieeefp.h>
I think the code needs to be rewritten, but I'm
not sure what to do.  I think the whole code in
#ifdef sun, should be something like this (for solaris 8 only):

    #include <floatingpoint.h>
    sigfpe(FPE_FLTOVF, handler);
    sigfpe(FPE_FLTDIV, handler);
    sigfpe(FPE_FLTUBV, handler);

or

    #include <ieeefp.h>
    fpsetmask(FP_X_INV | FP_X_OFL | FP_X_DZ);   
PyOS_setsig(SIGFPE, handler);

But that's a guess from the man pages.
Are there any tests for fpectl?