Avoiding "ISO C99 requires rest arguments to be used"
c, c99, gcc, gcc-warning, variadic-macros
Solution
I think my problem was here:
#define NARGS(...) NARGS_(__VA_ARGS__, 5, 4, 3, 2, 1)
#define NARGS_(_1, _2, _3, _4, _5, _, ...) _
Changing that to:
#define NARGS(...) NARGS_(__VA_ARGS__, 5, 4, 3, 2, 1, 0)
#define NARGS_(_1, _2, _3, _4, _5, _, ...) _
Seems to have fixed it
Problem
With gcc 4.6.3 (with -ansi -pedantic), I've got the following code: ``` // Argument counting macro #define NARGS(...) NARGS_(__VA_ARGS__, 5, 4, 3, 2, 1) #define NARGS_(_1, _2, _3, _4, _5, _, ...) _ static inline void fi_init_(size_t nargs, fileinfo_t *finfo, ...) { // Default fmt/type values char* fmt = "CD"; int type = 1000; if (nargs == 2) { va_list ap; va_start(ap, hdr); fmt = va_arg(ap, char*); type = va_arg(ap, int); va_end(ap); } // Do some junk with it } #define fi_init(...) fi_init_(NARGS(__VA_ARGS__)-1, __VA_ARGS__) ``` When called as: ``` fileinfo_t out; fi_init(&out); ``` I get a warning: warning: ISO C99 requires rest arguments to be used When called as: ``` fileinfo_t out; fi_init(&out, "CF", 2222); ``` I don't. How can I suppress this?