Re: reasons for having no inclusion guards in config.h

[Bob Friesenhahn]

On Mon, 8 Mar 2010, Steffen Dettmer wrote:

> On Mon, Mar 8, Bob Friesenhahn <address@hidden> wrote:
> > It is also interesting to note that it is usually ok for the
> > content of the header file to be parsed any number of times.
> > The only exception might be with some weird macro expansion
> > (but that would be a bug).
> >
> > The conditional inclusion of content is only an optimization.
>
> If you have a struct definition (C/C++) or a typedef (C) in the
> .h file, C compilers may refuse to process it twice and an
> inclusion guard is needed:

That is true, but if the same definition comes from two different 
config.h files, how does the multiple inclusion protection help?

Bob
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/