[yocto] Difference between target, cross, native and nativesdk.

[Paul Eggleton]

On Tuesday 20 January 2015 12:39:16 Raphael Philipe wrote:
> On Tue, Jan 20, 2015 at 10:23 AM, Paul Eggleton
> <paul.eggleton at linux.intel.com> wrote:
> > On Tuesday 20 January 2015 09:17:49 Raphael Philipe wrote:
> >> I'm working on a set of recipes that must be configurable to be baked
> >> in native, nativesdk, cross and target.
> >> 
> >> I have a bunch of questions concerning this terms. I searched the
> >> documentation and wasn't able to find a definitive explanation for
> >> these terms.
> >> 
> >> I will write some statements bellow about my understanding on these
> >> terms, and I will ask you to please correct me if I'm wrong or add any
> >> additional information:
> >> 
> >> - By default, recipes bake binaries for the target architecture that
> >> is described in the MACHINE variable in the local.conf
> > 
> > Correct.
> > 
> >> - One can use BBCLASSEXTEND = "native nativesdk" to bake binaries for
> >> the host architecture (native) and for target sdk architecture. The
> >> target sdk architecture is described in the SDKMACHINE variable and
> >> the host architecture is the architecture of the machine executing
> >> bitbake. BBCLASSEXTEND = "native nativesdk" will alow you to bake
> >> recipes that are "virtual" using the suffix native ( so ${PN}-native)
> >> and the prefix nativesdk (so nativesdk-${PN}).
> > 
> > Correct. FYI alternatively you can also "inherit native" or "inherit
> > nativesdk" to make a recipe specific to either of those classes (in which
> > case the recipe itself should be named <something>-native or nativesdk-
> > <something>), however BBCLASSEXTEND is preferred these days.
> > 
> >> - Recipes that are cross need to inherit cross.bbclass. They are used for
> >> ????
> > 
> > Cross tools, i.e. tools that need to run in the native context and produce
> > some binary output for the target.
> 
> For u-boot-fw-utils-cross, the binary that you refer is the enviroment
> variables file of u-boot? In this case, the difference between cross
> and native is not clear for me.

I'm not sure of the details for this recipe specifically. Perhaps one of the 
people on CC can answer.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre