Kövesdi György wrote: > I found that the function other_class::f2() cannot be inlined I filled the blanks in your example with simple code and f1 as well as f2 were inlined into the called of f2 when using -O1. You should provide a complete compilable example of a situation that doesn't do what you want. > Trying to add __attribute__((inline)) the result is a warning > message about ignoring this attribute. I guess it's because if you define a method directly in the class body, you implicitely tell the compiler to inline it, thus making this attribute redundant. See [1]. (It still only happens with optimization turned on.) [1] http://www.parashift.com/c++-faq-lite/inline-functions.html#faq-9.8