If -Wformat is enabled, try harder to chase down compile-time constant
format strings.. capable of catching things like:
const char foo[]="%s %d";
printf(foo, 1, "2");
If the new option -Wnetbsd-format-audit (no, I don't like the name,
either) is enabled, complain about non-constant format strings we
can't verify. In particular, for *v*printf-like functions (i.e.,
non-variadic functions which are passed a va_list), insist that the
format string come from a parameter declared as a format string
argument, so that functions which should be declared as printflike are
caught at compile time.
sommerfeld