(j3.2006) (SC22WG5.4777) [ukfortran] [WG5 letter ballot 4 on Fortran 2008 interpretations]

[N.M. Maclaren]

This is merely a remark on a response, not a response.

On Sep 15 2012, Van Snyder wrote:
>
>-C-  ---  F08/0057   Interoperability with empty types
>
>          Does this need a compatibility caveat in 1.6?

I doubt it.  While empty structures are allowed in C++, including in its
C mode, and they are allowed as an extension in gcc and Intel C, it IS
explicitly and clearly illegal in C and has not been added even to C11.
Despite the statement in the question, it is neither a syntax error nor
a constraint in C - it is merely forbidden, and so can be extended
without needing a warning - but compatibility caveats for interoperability
with extended C languages does seem to be going a bit far.


Regards,
Nick Maclaren.