printf() checking for custom functions

[David Daney]

Randall Hopper wrote:
> -Wformat causes printf() args to be checked based on the format:
> 
>    int printf(const char *format, ...);
> 
> How do ask gcc to apply this same checking to user-defined functions?
> 
>    int myDebug(const char *format, ...);
> 
> Apps often implement their own version of printf() for debugs, warnings,
> etc. with output switchable between console, log files, both, etc.  It
> would be very useful to have gcc perform similar sanity checks for their
> arg lists.
> 

Look at:

http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes

Scroll down to the part about the 'format' attribute.

David Daney