Re: Interesting new GCC warning

[Ken Cline]

On Fri, 19 Mar 1999, Paul E. Johnson wrote:

> When I used egcs to compile the example test code you
> sent, I got a warning I had never seen before.  Have you
> seen this too? What do you think? 
> 
> main.m:1: warning: using `#import' is not recommended
> The fact that a certain header file need not be processed
> more than once should be indicated in the header file, not
> where it is used. The best way to do this is with a
> conditional of this form:
> 
>   #ifndef _FOO_H_INCLUDED
>   #define _FOO_H_INCLUDED
>   ... <real contents of file> ...
>   #endif /* Not _FOO_H_INCLUDED */
> 
> Then users can use `#include' any number of times.
> GNU C automatically avoids processing the file more than
> once when it is equipped with such a conditional.

This warning has been around for awhile, although I don't
remember being so verbose. The Swarm makefiles use (or used
to use) the "-Wno-import" option to quiet the compiler.


_________________________________________________________
Ken Cline                             address@hidden
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