(j3.2006) Interop observation

[Bill Long]

On 2/6/12 5:07 PM, Van Snyder wrote:
> A colleague has observed that it's not terribly difficult to construct a
> duplicate definition using interop features.
>

It is also not terribly difficult for the linker to inform you that, 
assuming good aim, you now have only 4 toes left.

There was a thread on this topic a while ago.

Cheers,
Bill


> The example was
>
>      SUBROUTINE AnyNamesubf(i)BIND(C,NAME="csubf_")
>      USE, INTRINSIC :: iso_c_binding, ONLY: c_int
>
>        INTEGER(c_int) :: i
>        CALL Csubf(i)
>      END SUBROUTINE AnyNamesubf
>
> where Csubf was a non-interoperable Fortran external subroutine.
>
> I don't think this is a normative issue for the standard, but should we
> put a note somewhere that might help people not create these?  Maybe
> something like advising not to give binding names to Fortran procedures
> that are all lower case (or all upper case) and are sufficiently similar
> to the external names of non-interoperable Fortran external procedures
> that the linker might be sent the same name for both of them.
>
>
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-- 
Bill Long                                           longb at cray.com
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