[oe] [meta-oe][PATCH v1 3/4] BCC: Add build recipe

[Leo Yan]

Hi Khem,

On Mon, Feb 17, 2020 at 10:30:46PM -0800, Khem Raj wrote:

[...]

> > +DEPENDS += "bison-native \
> > +            ninja-native \
> > +            elfutils-native \
> > +            flex-native \
> > +            ${MLPREFIX}elfutils \
> > +            ${MLPREFIX}binutils \
> > +            ${MLPREFIX}flex \
> > +            luajit \
> > +            clang \
> > +            "
> > +
> 
> this will add meta-clang dependency directly into meta-oe, which is not desired
> is it possible to make it optional or perhaps marked when meta-clang
> is not in BBLAYERS

Thanks a lot for reviewing.  clang is mandotory for BCC to compile
eBPF programs, so I think we cannot build clang as optional for BCC.

For marking the recipe when meta-clang is not in BBLAYERS, I searched
with google but seems 'LAYERDEPENDS' and 'BBMASK' both are not suitable
for this case.  Could you give more detailed info for how to do this?

Thanks,
Leo