Where do I find the assembly code for a procedure called in the GCC assembly output?

Question

I\'ve been playing around with the assembly output switch for GCC:

gcc -S -c helloworld.c

helloworld.c:

#i         


        

Answer 1

EDIT: this is not actually an answer to the original question, but since it's getting upvoted the info seems to be useful, so...

---

It's an optimization by GCC. Since your string does not contain any formatting characters and ends with a newline, GCC replaces the call with puts which produces the same output but is much faster (since it doesn't need to scan the string for formatting specifiers). Try something like:

int main(int argc, char *argv[]){
    printf("Hello World!\nargc=%d", argc);
    return 0;
}

And you will see your printf in the assembly.