RealView Compilation Tools Compiler Reference Guide: 5.2.8. Extern inline functions

5.2.8. Extern inline functions

The ISO C++ Standard requires inline functions to be defined wherever you use them. To prevent the clashing of multiple out-of-line copies of inline functions, the C++ compiler emits out-of-line extern functions in common sections.

Out-of-line inline functions

The compiler emits inline functions out-of-line, in the following cases:

The address of the function is taken, for example:

inline int g()
{
    return 1;
}
int (*fp)() = &g;

The function cannot be inlined, for example, a recursive function:
```
inline int g()
{
    return g();
}
```
The heuristic used by the compiler decides that it is better not to inline the function. This heuristic is influenced by -Ospace and -Otime. If you use -Otime, the compiler inlines more functions. You can override this heuristic by declaring a function with __forceinline. For example:
```
__forceinline int g()
{
    return 1;
}
```
See also ‑‑forceinline for more information.

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