Function with default parameter doesn't get it's prototype in *.h header file.

When you write a function with at least one parameter with default value
eg.

``` c
void foo(int a, int b = 0)
{
}
```

it does not gets generated it's prototype in header file, which results in an unreferenced calls in project to that function. When you remove the default parameter

``` c
 = 0
```

the prototype shows in header file as expected.
