Which, if any, C++ compilers do tail-recursion optimization?

Question

It seems to me that it would work perfectly well to do tail-recursion optimization in both C and C++, yet while debugging I never seem to see a frame stack that indicates th

Answer 1

gcc 4.3.2 completely inlines this function (crappy/trivial atoi() implementation) into main(). Optimization level is -O1. I notice if I play around with it (even changing it from static to extern, the tail recursion goes away pretty fast, so I wouldn't depend on it for program correctness.

#include 
static int atoi(const char *str, int n)
{
    if (str == 0 || *str == 0)
        return n;
    return atoi(str+1, n*10 + *str-'0');
}
int main(int argc, char **argv)
{
    for (int i = 1; i != argc; ++i)
        printf("%s -> %d\n", argv[i], atoi(argv[i], 0));
    return 0;
}