[Bug other/42333] New: complex division failure on darwin10 with -lm

[ghazi at gcc dot gnu dot org]

As noted in PR42074, linking with the math library on darwin10 allows overflow
to occur during complex division.  It was originally reported as a failure in
testcase gcc.dg/torture/builtin-math-7.c at all optimization levels.  However
as described in http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42074#c10 the error
is related to using -lm on the reduced testcase below.  Without -lm it passes,
with -lm a failure occurs.  As such, it isn't necessarily a bug in GCC, however
this PR will help track if there is a possible workaround.


int main(void)
{
  volatile _Complex double val = (__DBL_MAX__ * 0.5 + __DBL_MAX__ * 0.5i);
  val /= (__DBL_MAX__ * 0.25 + __DBL_MAX__ * 0.25i);
  __builtin_printf ("%g %g\n", __real (val), __imag (val));
  if (val != 2) __builtin_abort();
  return 0;
}


-- 
           Summary: complex division failure on darwin10 with -lm
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ghazi at gcc dot gnu dot org
GCC target triplet: *-*-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42333