[OE-core] [PATCH] package.bbclass: allow using EXCLUDE_FROM_SHLIBS for subpackages

[Richard Purdie]

On Mon, 2016-10-10 at 20:02 +0300, Andrii Bordunov wrote:
> Some packages containing shared libraries might be registered
> as shlib providers when they shouldn't (for example, the lib is for
> their private use and must not generate any dependency).
> 
> EXCLUDE_FROM_SHLIBS is targeted at that, but it could be set
> for entire recipe only.
> 
> This patch expands EXCLUDE_FROM_SHLIBS usage, so now it's possible
> to set it in a style similar with RDEPENDS. For example:
>  EXCLUDE_FROM_SHLIBS_${PN}-ptest = "1"
> 
> Signed-off-by: Andrii Bordunov <aborduno at cisco.com>
> ---
>  meta/classes/package.bbclass | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)

My main concern here is actually performance. For a package with many
sub packages you just added many calls to getVar when that getVar is
extremely unlikely to find any value. Whilst not hugely slow, that
operation isn't trivial and hard to fix later.

I'm wondering if we could support the syntax

EXCLUDE_FROM_SHLIBS = "${PN}-ptest"

and then have "1", used in a couple of places as the special value to
mean all packages?

Also please use False, not 0 as the parameter to getVar.

Cheers,

Richard