Re-enable floating point exceptions.

tests/testActivePair.c

@@ -423,7 +423,7 @@ int main(int argc, char *argv[]) {
   clocks_set_cpufreq(cpufreq);
 
   /* Choke on FP-exceptions */
-  //feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
+  feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
 
   /* Generate a RNG seed from time. */
   unsigned int seed = time(NULL);