Answer by RotatingWheel for How to solve static declaration follows non-static declaration in GCC C code?

You have declared a function as non static in some file and you have implemented as static in another file or somewhere ion the same file can cause this problem also. For example the following code will produce this error.

void inlet_update_my_ratio(object_t *myobject);
//some where the implementation is like this
static void inlet_update_my_ratio(object_t *myobject) {
//code
}

If you remove the static from the implementation, the error will go away as below.

 void inlet_update_my_ratio(object_t *myobject) {
    //code
    }