在 2024/1/12 22:07, Licht Martin Werner via Gcc-help 写道:
> The answer used to be a certain yes when all optimizations were exclusive to the translation unit. 
> By now, link-time optimization has been a thing for a while, and one might imagine that defining 
> functions in header does not make a difference for optimization anymore.
> 
> (Of course, placing functions in header files or asking for link-time optimization will affect the 
> compilation speed and memory use)
> 
> Discussions of this question seem to be based on hearsay, so I'd rather hope for an answer straight 
> from the source. Thanks.

I'm still having a project which usually compiles and links in two minutes, but with LTO would take 
hours to link. I can give a link if you are interested.

I'd like to say that LTO is still not an option for me.


-- 
Best regards,
LIU Hao