如何内联一个仅用于发布构建的函数

// common.h
// This is foo function. It has a body.
__inline void foo() { /* something */ }

// a.cpp
#include "common.h" // for foo function
// Call foo

// b.cpp
#include "common.h" // for foo function
// Call foo
// common.h
// This is foo function. It has a b