From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-469094-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 4217 invoked by alias); 1 Dec 2014 15:03:09 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 4170 invoked by uid 48); 1 Dec 2014 15:03:05 -0000
From: "wong.david-c at epa dot gov" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/64138] New: gfortran interface issue
Date: Mon, 01 Dec 2014 15:03:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 4.9.3
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: wong.david-c at epa dot gov
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-64138-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-12/txt/msg00101.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64138

            Bug ID: 64138
           Summary: gfortran interface issue
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wong.david-c at epa dot gov

Hi,

   I have created a complex number module:

       module complex_number_module
        implicit none

        integer, parameter :: loc_real_precision = 8

        type complex_number
          real(kind=loc_real_precision) :: real_part, imag_part
        end type complex_number

        interface c_sub
          module procedure c_sub_cc,    &      ! z1 - z2
                           c_sub_cr,    &      ! z1 - num, where num is a real
number
                           c_sub_rc            ! num - z1, where num is a real
number
        end interface

! --------------------------------------------------------------------------
        type (complex_number) function c_sub_cc (z1, z2)

        type (complex_number), intent(in) :: z1, z2

        c_sub_cc%real_part = z1%real_part - z2%real_part
        c_sub_cc%imag_part = z1%imag_part - z2%imag_part

        end function c_sub_ccj

! --------------------------------------------------------------------------
        type (complex_number) function c_sub_cr (z1, num)

        type (complex_number),     intent(in) :: z1
        real(kind=loc_real_precision), intent(in) :: num

        c_sub_cr%real_part = z1%real_part - num
        c_sub_cr%imag_part = z1%imag_part

        end function c_sub_cr

! --------------------------------------------------------------------------
        type (complex_number) function c_sub_rc (num, z1)

        type (complex_number),     intent(in) :: z1
        real(kind=loc_real_precision), intent(in) :: num

        c_sub_rc%real_part = num - z1%real_part
        c_sub_rc%imag_part = - z1%imag_part

        end function c_sub_rc

      end module complex_number_module

When I compile with gfortran (version 4.6.4), I got the following error:

module_twoway_rrtmg_aero_optical_util.F:14.85:

                 c_sub_rc            ! num - z1, where num is a real number
                                                                           1    
Error: Ambiguous interfaces 'c_sub_rc' and 'c_sub_cr' in generic interface
'c_sub' at (1)

I don't see any ambiguity and I don't encounter any problem with other
compilers such pgi and ifort. Please advise.

Cheers,
David