* warnings appearing during preprocessor string concatenation (##)
@ 2003-03-05 20:34 Jamie Risk
2003-03-06 13:10 ` Robert Schiele
0 siblings, 1 reply; 2+ messages in thread
From: Jamie Risk @ 2003-03-05 20:34 UTC (permalink / raw)
To: linux-gcc; +Cc: linux-newbie, linux-c-programming
I have the following line in my code,
#define FEATURE(select) feature_structure. ## select ## .member
...
FEATURE(test);
and when I run it through the compiler (gcc 3.2.2 on Linux x86) I get the
_warning_
file.c:111:32: warning: pasting "." and "test" does not give a valid
preprocessing token
file.c:111:32: warning: pasting "test" and "." does not give a valid
preprocessing token
If I look at the preprocessor output, (gcc's -E option) it produces what I'm
hoping for, although I'd like to avoid the warning. Suggestions?
- Jamie
Reply to "gmane.linux.c-programming" or me directly.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: warnings appearing during preprocessor string concatenation (##)
2003-03-05 20:34 warnings appearing during preprocessor string concatenation (##) Jamie Risk
@ 2003-03-06 13:10 ` Robert Schiele
0 siblings, 0 replies; 2+ messages in thread
From: Robert Schiele @ 2003-03-06 13:10 UTC (permalink / raw)
To: Jamie Risk; +Cc: linux-gcc, linux-newbie, linux-c-programming
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On Wed, Mar 05, 2003 at 03:34:39PM -0500, Jamie Risk wrote:
> I have the following line in my code,
>
> #define FEATURE(select) feature_structure. ## select ## .member
> ...
> FEATURE(test);
>
> and when I run it through the compiler (gcc 3.2.2 on Linux x86) I get the
> _warning_
>
> file.c:111:32: warning: pasting "." and "test" does not give a valid
> preprocessing token
> file.c:111:32: warning: pasting "test" and "." does not give a valid
> preprocessing token
>
> If I look at the preprocessor output, (gcc's -E option) it produces what I'm
> hoping for, although I'd like to avoid the warning. Suggestions?
Just remove the '##' operator. The preprocessor is right here, there
is nothing to concatenate to a token in your example.
Robert
--
Robert Schiele Tel.: +49-621-181-2517
Dipl.-Wirtsch.informatiker mailto:rschiele@uni-mannheim.de
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