[Bug fortran/22503] New: Suggest to use .EQV. when comparing logicals with .EQ.

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Consider the following code snippet:

===========================
       subroutine FOO
         logical I
         I = I .eq. I
       end subroutine FOO
===========================

g77 used to give the following error message with the suggesiton what to do:

test.f: In subroutine `foo':
test.f:3: 
            I = I .eq. I
                1 2    3
Use .EQV./.NEQV. instead of .EQ./.NE. at (2) for LOGICAL operands at (1) and (3)

gfortran only gives:

 In file test.f90:3

         I = I .eq. I
            1
Error: Operands of comparison operator '.eq.' at (1) are LOGICAL(4)/LOGICAL(4)


A suggestion to use .EQV./.NEQV. instead would be nice (especially since
other compilers accept the code without modification).

-- 
           Summary: Suggest to use .EQV. when comparing logicals with .EQ.
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: enhancement
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22503