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Date: Sun, 25 May 2008 13:36:00 -0000
Subject: [Bug fortran/36325]  New: specific or generic INTERFACE implies the EXTERNAL attribute
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From: "jaydub66 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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I think the following code is invalid:

interface
  subroutine foo
  end subroutine
end interface
external foo

Because the INTERFACE statement already specifies the EXTERNAL attribute, which
is thus specified twice.

This code *is* actually rejected (as of rev. 135859), but the error message is
completely wrong:

external :: foo
              1
Error: EXTERNAL attribute conflicts with SUBROUTINE attribute at (1)

(which it does *not* for this case)


Quoting the Fortran 2003 standard (section 5.1.2.6):

"The EXTERNAL attribute specifies that an entity is an external procedure,
dummy procedure, procedure pointer, or block data subprogram. This attribute
may also be specified by an EXTERNAL statement (12.3.2.2), a
procedure-declaration-stmt (12.3.2.3) or an interface body that is not in an
abstract interface block (12.3.2.1)."

And further on in section 12.3.2.1:

"An interface body in a generic or specific interface block specifies the
EXTERNAL attribute and an explicit specific interface for an external
procedure or a dummy procedure. If the name of the declared procedure is that
of a dummy argument in the subprogram containing the interface body, the
procedure is a dummy procedure; otherwise, it is an external procedure."


-- 
           Summary: specific or generic INTERFACE implies the EXTERNAL
                    attribute
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jaydub66 at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36325