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#include <stdio.h>
 
#define ARG_ARRAY(...) ((int[]) { __VA_ARGS__ })
#define ARG_COUNT(...) (sizeof (ARG_ARRAY(__VA_ARGS__)) / sizeof (int))
 
#define STUFF(label, ...) \
    stuff(label, ARG_COUNT(__VA_ARGS__), ARG_ARRAY(__VA_ARGS__))
 
void stuff(char *label, int count, int *values) {
    printf("[%s] count %d", label, count);
 
    for (int i = 0; i < count; i++) {
        printf("%s %d", (i == 0) ? ":" : ",", values[i]);
    }
 
    printf("\n");
}
 
int return1(void) {
    printf("Called `return1()`.\n");
    return 1;
}
 
int main(int argc, char **argv) {
    STUFF("blort");
    STUFF("frotz", return1());
    STUFF("fizmo", 2 + 3, 6 + 1);
    STUFF("glorf", 99, 999, 999);
    STUFF("igram", 9, 8, 7, 6, 5, 4, 3, 2, 1);
}

prog.c: In function ‘main’:
prog.c:25:18: error: ISO C99 requires rest arguments to be used [-Werror]
     STUFF("blort");
                  ^
prog.c:3:33: error: ISO C forbids empty initializer braces [-Werror=pedantic]
 #define ARG_ARRAY(...) ((int[]) { __VA_ARGS__ })
                                 ^
prog.c:4:33: note: in expansion of macro ‘ARG_ARRAY’
 #define ARG_COUNT(...) (sizeof (ARG_ARRAY(__VA_ARGS__)) / sizeof (int))
                                 ^
prog.c:7:18: note: in expansion of macro ‘ARG_COUNT’
     stuff(label, ARG_COUNT(__VA_ARGS__), ARG_ARRAY(__VA_ARGS__))
                  ^
prog.c:25:5: note: in expansion of macro ‘STUFF’
     STUFF("blort");
     ^
prog.c:25: confused by earlier errors, bailing out

Standard output is empty