[oe] [RFC][PATCH] package.bbclass: export subpackage individual version, if different from main

[Denys Dmytriyenko]

On Sun, Sep 20, 2009 at 09:40:22AM +0100, Phil Blundell wrote:
> On Sun, 2009-09-20 at 02:33 -0400, Denys Dmytriyenko wrote:
> > Fixes the wrong versioned runtime dependency for shlib subpackages with
> > own versions. Consider this:
> > 
> > PACKAGES = "libfoo libbar"
> > PV_libfoo = "1"
> > PV_libbar = "2"
> > PV = "3"
> 
> Is this even legitimate usage?  I had always thought that PV applied to
> the recipe, not to the output subpackages.

PV_<pkg> works as is, because it is handled by the same code that does 
FILES_<pkg>, DESCRIPTION_<pkg>, RDEPENDS_<pkg>, RPROVIDES_<pkg>, PKG_<pkg> 
etc. And generated subpackages receive own versions just fine.
But for shared libraries in subpackages it has this small issue of exporting 
the main PV in shlibs/pkgdata/runtime...

> What's the typical use-case for this kind of thing?

As Koen said, helpful for large meta-packages. In the case of external 
toolchain, the main package may have version like "2009q1", while different 
subpackages can get their own versions, like "2.8" for libc, "4.3.3" for 
libstdc++ etc. Slightly convoluted example at [1]
W/o this fix I was getting runtime dependencies for libc >= 2009q1, instead
of 2.8

[1] http://arago-project.org/git/?p=arago.git;a=commitdiff;h=a6b686d9a5a81b55e17ef241f8c50a428639c048

-- 
Denys