Question on ELIX_LEVEL

[Can Finner]

> Hi,
> There is newlib configuration option --enbale-newlib-elix-level, which
> is set to 0 by default.
> The question is what do all these levels mean? Are there any rules in
> setting the level?
> How should I decide to set it to which level?
>
> I searched around and only found it is something used by elix. Any help?
>

Seems the EL/IX standard maps library functions into different levels,
which should be set when designing
specific embedded system, and newlib keeps these for backward
compatibility, right?
If true, we should use the level 0 or level 4 when configuring newlib?

Thanks
-- 
Regards.