Re: [Mingw-users] MingW and the #import preprocessor directive...

[Luke D. <cod...@ho...>]

----- Original Message ----- 
From: "Danny Smith" <dan...@ya...>
To: <min...@li...>
Sent: Monday, July 21, 2003 10:07 AM
Subject: Re: [Mingw-users] MingW and the #import preprocessor directive...


> --- Greg Chicares wrote: > John Brown wrote:
> > >
> > > >Jonathan Wilson wrote:
> > > > >
> > > > > Are there any plans to make mingw recognize and use the #import
> > > > > preprocessor directive
> > >
> > > >Greg Chicares wriote:
> > >
> >
>
>http://search.gmane.org/search.php?query=import+directive&email=&group=gman
e.comp.gnu.mingw.user&sort=date
> > >
> > > Where does this link say whether supporrt for #import is planned?
> >
> > Clicking through the first link to
> >
> >   http://article.gmane.org/gmane.comp.gnu.mingw.user/6779/
> >
> > I see one of the project administrators saying
> >
> >   "this feature is not supported by MinGW"
> >
> > which suggests there's little chance that this
> > nonstandard feature will be supported. Perhaps
> > other search results say more.
> >
> You might search GCC doc's themselve (in cpp.info) and find out what they
have to say:
>
> "   In the Objective-C language, there is a variant of `#include' called
> `#import' which includes a file, but does so at most once.  If you use
> `#import' instead of `#include', then you don't need the conditionals
> inside the header file to prevent multiple inclusion of the contents.
> GCC permits the use of `#import' in C and C++ as well as Objective-C.
> However, it is not in standard C or C++ and should therefore not be
> used by portable programs."
>
> "   `#import' is not a well designed feature.  It requires the users of
> a header file to know that it should only be included once.  It is much
> better for the header file's implementor to write the file so that users
> don't need to know this.  Using a wrapper `#ifndef' accomplishes this
> goal."
>
> Danny

I assume you are pointing this out as a reason why MS #import will not be
implemented in GCC? I'm just saying because this Objective-C #import is
completely unrelated to the MSVC meaning, but some users may not realise
this.

Luke