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-fno-inline-functions
Disabling the inlining of functions can help to improve the debug experience.
The compiler attempts to automatically inline functions at optimization levels
-O2 and -O3. When these levels are used with -fno-inline-functions,
automatic inlining is disabled.
When optimization levels -O0 and -O1 are used with -fno-inline-functions, no automatic
inlining is attempted, and only functions that are tagged with
__attribute__((always_inline)) are inlined.