[avr-gcc-list] Why EthNut2.4.2 should use -Os instead of -O3?

[Hudaidai]

I am a newbie to this maillist.  But I have used AVRGCC for 2 years and maybe 
it is not too late to find the maillist now.

I read some letters before, thank you for your great work and kind help to 
everyone.

I used Harald Kipp's EthNut2.4.2 in my project several weeks ago. It works very 
fine now. I'd found that the compiling option is changed from -O3 to -Os in 
verion 2.4.2, I didn't know why(and I didn't change it).  A letter from Harald 
Kipp in July archives was noticed yesterday.  It said:

>However, I switched from -o3 to -os, because level 3
>tries to inline nearly every local function, which
>probably breaks the multithreading support (stolen
>from the Liquorice project).

I can't understand it very well.  Would someone explain it to me more clearly?


　　　　　　　　Hudaidai
address@hidden
　　　　　　　　　　2002-08-29




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