7.66 --forceinline

Forces all inline functions to be treated as if they are qualified with __forceinline.

Inline functions are functions that are qualified with inline or __inline. In C++, inline functions are functions that are defined inside a struct, class, or union definition.
If you use --forceinline, the compiler always attempts to inline those functions, if possible. However, it does not inline a function if doing so causes problems. For example, a recursive function is inlined into itself only once.
__forceinline behaves like __inline except that the compiler tries harder to do the inlining.
Related reference
7.87 --inline, --no_inline
9.8 __inline
9.6 __forceinline
9.30 __attribute__((always_inline)) function attribute
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