[C] enabling in C: f  function definitions
[C] disabling in C: f  function definitions [off]
[C++] enabling in C: f  function definitions
[C++] disabling in C: f  function definitions [off]
[C] enabling in C++: f  function definitions
[C] disabling in C++: f  function definitions [off]
[C++] enabling in C++: f  function definitions
[C++] disabling in C++: f  function definitions [off]
