[yocto] confusion about DEPENDS vs RDEPENDS

[Paul Eggleton]

Hi Lothar,

On Monday 02 September 2013 15:17:28 lothar at denx.de wrote:
> I followed this very interesting thread, and have a question on the last
> statement, just for understanding:
> 
> Are the limitations you are explaining here, the same as mentioned in...
> http://www.yoctoproject.org/docs/current/mega-manual/mega-manual.html
> ...under "Checksums (Signatures)", telling that:
> "Consider a case with in-line Python, for example, where BitBake is not
> able to figure out dependencies."   ? So to speak, are those limitations
> the cases, where bitbake is not able to figure out dependencies
> correctly?

That is to do with variable dependencies so it's not exactly what is being 
discussed earlier in the thread; however if these are not able to be detected 
they can result in signatures not changing when you change the value of one of 
the variables upon which there is a missing dependency and thus items not 
being rebuilt as expected. However, there is some "magic" in 
bitbake/lib/bb/codeparser.py which picks up most of the common cases within 
python code (e.g. usage of d.getVar()), so most of the time this is not a 
concern.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre