一、--autoinline, --no_autoinline

These options enable and disable automatic inlining of functions.

The compiler automatically inlines functions at the higher 
optimization levels where it is sensible to do so. The -Ospace 
and -Otime options, together with some other factors such as 
function size, influence how the compiler automatically inlines functions.

Selecting -Otime, in combination with various other factors, 
increases the likelihood that functions are inlined.

In general, when automatic inlining is enabled, the compiler inlines 
any function that is sensible to inline. When automatic inlining is 

disabled, only functions marked as __inline are candidates for inlining.



Use these options to control the automatic inlining of functions at the 
highest optimization levels (-O2 and -O3).

For optimization levels -O0 and -O1, the default is --no_autoinline.

For optimization levels -O2 and -O3, the default is --autoinline.