> The problem with C is that it doesn't have proper tail recursion, so if you want to use C as a target language for something that does have proper tail recursion, you pretty much have no choice but to make goto soup.

Or you could, you know, use a normal loop...

Besides, since 2005 or thereabouts gcc with -O2 did proper tail-call optimisation so that the stack doesn't grow on a tail-call recursion.