24cccab42c
While I was able to trick gcc into keeping a pathological recursion, Clang was not so easily fooled. Instead, switch to using "volatile" and side-effects to keep the stack variable allocated and to run the function. Additionally renames "OVERFLOW" to "EXHAUST_STACK" to better describe the test. Signed-off-by: Kees Cook <keescook@chromium.org>