[Bug driver/19116] New: -fno-finite-math-only does not override -ffast-math

["Thomas dot Koenig at online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

$ cat nan-find.f90
program main
  real :: a,b,c
  logical :: l
  b = 0.
  c = 0.
  a = b/c
  call nanfind(a,a,l)
  if (l) then
     print *,a,"compares equal to itself"
  else
     print *,a,"compares unequal to itself"
  end if
end program main

subroutine nanfind(a,b,l)
  real,intent(in) :: a,b
  logical, intent(out) :: l
  l = a == b
end subroutine nanfind
$ gfortran -O3 -ffast-math -fno-finite-math-only nan-find.f90
$ ./a.out
            NaN compares equal to itself
$ gfortran -v
Using built-in specs.
Configured with: ../gcc/configure --prefix=/home/ig25
--enable-languages=c,c++,f95 : (reconfigured) ../gcc/configure
--prefix=/home/ig25 --enable-languages=c,c++,f95
Thread model: posix
gcc version 4.0.0 20041221 (experimental)
$

Then again, I never liked the fact that NaNs can compare
equal with any compiler option...

-- 
           Summary: -fno-finite-math-only does not override -ffast-math
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: driver
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Thomas dot Koenig at online dot de
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19116