[Tinyos-devel] Compiler Flags in telosb.target

[Philip Levis]

On Aug 9, 2008, at 10:47 AM, Geoffrey Werner-Allen wrote:

> For whatever reason, the telosb.target makefile target overrides  
> the usual -Os optimization setting in favor of the slightly less  
> exciting -O.  For some time now I've been overriding this on the  
> command like with CFLAGS, particularly helpful when you are  
> compiling stuff that is right at the TMote space limitations and - 
> Os will shave of a kilobyte or two.
>
> I'm not sure what the reasoning behind -O is but is it possible  
> that this could be a legacy thing and safely removed?  I talked to  
> Kevin and he didn't understand it either but suggested I ping the  
> list to see if anyone does.

I think Vlado brought this up on a core WG call a few months ago.  
IIRC, there are code generation problems with -Os? David Gay knows  
the details.

Phil