[Bug fortran/55539] New: [4.8 Regression] -fno-sign-zero may generate wrong formatted output

[anlauf at gmx dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55539



             Bug #: 55539

           Summary: [4.8 Regression] -fno-sign-zero may generate wrong

                    formatted output

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: fortran

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: anl...@gmx.de





The code



program gfcbug120

  implicit none

  real(4) :: x = -1.2e-3

  real(8) :: y = -1.2e-3

  print *, x, y

  print '(7f10.3)', x, y

end program gfcbug120



incorrectly prints



  -1.20000006E-03  -1.2000000569969416E-003

     0.001     0.001



with -fno-sign-zero; the correct result would be



  -1.20000006E-03  -1.2000000569969416E-003

    -0.001    -0.001



This works with 4.7.