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C and C++ Implementation Details
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 unsigned int fact(unsigned int n) {
return n < 2 1 : n * fact(n - 1);
}
• 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 on page 2-58 for more information.
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