Sergio Sobarzo <ssobarzo@xxxxxxxxx> writes: > I read that paragraph thousand of times. However it is not an answer > why it works if a line is commented or not. I cannot figure an > acceptable explanation, that's why I thought it will be a gcc > question. Commenting or uncommenting the variable declaration is just changing the random values that are on the stack when sem_open is called. In this case I expect it happens to be changing the values between valid and invalid ones. Failing to pass required arguments to a variadic function gives you random behaviour, and that is just what you are seeing. Ian
