[oe] bitbake dependency question

[Robert Yang]

Hi Robert

On 12/13/2016 10:10 AM, Robert Cagle wrote:
> I'm trying to figure out a reasonable way to specify dependencies on an unknown/virtual set of other recipes.
> For example,
>
> Recipe A: Plugin #1 (installs a plugin spec somewhere in /usr/share)
> Recipe B: Plugin #2 (same)
> Recipe C: Plugin #3 (same).
> Recipe D: Host Application (C based), which needs to be compiled last since it generates C code based on the spec files.
>
> I'd rather not hard-code dependencies in Recipe D since the specific set of plugins may be different depending on the specified distribution layer or machine type. I can define a variable in local.conf and use it to define D's dependencies, but that means I'll have to define the set twice: in the distribution layer and in local.conf. Based on what I've read and experimented with, this seems be my only choice (other than restructuring the application).
>

Try something like:
In recipeD.bb:
PLUGIN_RECIPES ??= "A" (or b, c)
DEPENDS = "${PLUGIN_RECIPES} other..."

In local.conf:
PLUGIN_RECIPES = "A" (or b, c).

// Robert

> I really just wanted to expand a variable in each of A,B,C
>    PLUGIN_RECIPES += "${PN}"
>
> And have D declare
>   DEPENDS = "${PLUGIN_RECIPES} other..."
>
> But that doesn't seem possible. Am I missing another way? (Python datastore maybe?)
>
> Thanks,
> Bob
>