clang-power-tools: Cannot perform tidy to header file.

// example.h
class A
{
public:
    virtual ~A() = default;
    virtual void func() = 0;
};
class B : public A
{
public:
    void func(); // 'override' is missing.
};

// example.cpp
#include "example.h"
void B::func() {}

I can’t perform tidy to header file. I can only perform it to source file. But the tidy operation to the source file cannot detect the problem that ‘override’ keyword is missing in the header file.