[Bug libfortran/25425] New: F95 and F2003 differ on list-directed output for 0.0

[fxcoudert at gcc dot gnu dot org]

It seems that, according to F95, list-directed formatting of zero must behave
as if formatted with the E descriptor (0.0E+00) while F2003 requires an F
format behaviour (0.0). See message
<1134632379.672465.126120@z14g2000cwz.googlegroups.com> on comp.lang.fortran
("writing formatted zeros with implicit formats", by robert.corbett@sun.com).

We currently implement the F2003 behaviour, independently of the -std flag.

$ cat a.f
      PROGRAM MAIN
        PRINT *, -2.1, -1.2, 0.0, 1.1, 2.2
      END
$ gfortran a.f && ./a.out
  -2.100000      -1.200000       0.000000       1.100000       2.200000    
$ ifort a.f && ./a.out
  -2.100000      -1.200000      0.0000000E+00   1.100000       2.200000


-- 
           Summary: F95 and F2003 differ on list-directed output for 0.0
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fxcoudert at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25425