Please give me an overview of the compile options (-o0), (-o1), (-o2), (-o3), and (-os) that can be set from the syslib property.

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Please give me an overview of the compile options (-o0), (-o1), (-o2), (-o3), and (-os) that can be set from syslib properties.

Nios II Embedded SW(OS)

The meaning of each is shown below.

option
・ -O0	: no optimization
	Use if gdb is not working properly
・ -O1/ -O	: basic optimization
	Avoid unnecessary register transitions, store values in registers to reduce memory accesses, etc.
・-O2	: Almost all optimizations
	No loop unrolling, inlining, or strict aliasing
・-O3	: all optimizations
	In addition to -O2 it will be inlined
・ -Os	: size optimization
	-O2 plus stop optimizations if they must be done resulting in large size

This option is similar to the GNU C/C++ compilation option

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