printf() checking for custom functions

[Randall Hopper]

David Daney:
 |Randall Hopper wrote:
 |>-Wformat causes printf() args to be checked based on the format:
 |>How do ask gcc to apply this same checking to user-defined functions?
 |>
 |>   int myDebug(const char *format, ...);
 |
 |Look at:
 |
 |http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes

That's perfect.  Thanks.  A problem I hit with it though is that:

   myDebug( "" );

fails to compile with:

   clone.cxx:252: warning: zero-length printf format string

Naturally, I compile with -Werror.  I tried -Wno-format-zero-length,
however this is C++ code, and GCC fails the build with:

   cc1plus: warning: command line option "-Wno-format-zero-length" is valid
            for C/ObjC but not for C++

even though I'm specifying valid printf() arguments.

Any way to kill this warning in C++?

Randall

P.S. myDebug() adds its own linefeed internally, so using "\n" instead
     of "" isn't correct here.