Re: [Xen-devel] debugging frustration

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

Luciano Miguel Ferreira Rocha wrote:

> Yes, but an empty macro results in the same thing as a do {} while (0)
>  
a = b
debug_printf("Message");

compiles cleanly if DEBUG is #define'd as ''

At the end of the day, we're dealing with a very imperfect system 
(cpp).  My philosophy on debug() macro's is that they should always map 
1-1 to a real function and simply provide that function with __LINE__, 
__FUNCTION__, and __FILE__.
If you're really concerned about performance, you can #ifdef DEBUG the 
body of the function and most compilers will correctly do nothing for 
those calls.
If it's any consolation, the next submission of VM-Tools will have a set 
of logging functions.  I can certainly submit patches to xcs and friends 
to use these functions..
Regards,

> if (ptr == null)
>    ;
> else
>    *ptr = 2
>
> The only problem is when the macro has some code (AFAIK).
>  
--
Anthony Liguori
anthony@xxxxxxxxxxxxx



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