On Sat, 2020-02-08 at 13:31 -0500, rpj...@crashcourse.ca wrote: > (part of the nitpickiness of some of these questions stems from > that, in my updated courseware, i want to use actual examples out of, > say, the openembedded layer, and not just contrived examples > involving > packages like "foo" and "bar". to that end, i want to be able to > explain why some recipes are written the way they are and, > conversely, > to explain why some recipes might look weird.) > > the bitbake manual has a reasonable explanation of > DEFAULT_PREFERENCE but there are examples in the OE layer that seem > to > not be written as cleanly as they could be. > > consider under recipes-devtools the two directories "pkgconfig" > and > "pkgconf", and the respective .bb files: > > - pkgconfig_git.bb > - pkgconf_1.6.3.bb > > the pkgconfig recipe file does *not* contain a PROVIDES setting, > while pkgconfig_1.6.3.bb does: > > PROVIDES += "pkgconfig"
The above looks superfluous at a glance. > so, given that, one expects that other recipes should have a > DEPENDency on "pkgconfig", which could be satisfied by either of > those. > > however, oddly, the file pkgconf_1.6.3.bb contains the line: > > DEFAULT_PREFERENCE = "-1" > > which seems odd as there don't appear to be any other recipes that > provide pkgconfig, and AIUI, the default provider for any recipe is > the recipe with *exactly* the same name as the target -- in this > case, "pkgconfig". DEFAULT_PREFERENCE works against versions, not providers. I'm not sure what that line is trying to do but I also suspect its superfluous. > so while that DEFAULT_PREFERENCE line doesn't hurt anything, in > this specific case (assuming i haven't overlooked any other recipes > that provide pkgconfig), that DEFAULT_PREFERENCE line is superfluous, > correct? For different reasoning, yes :) Cheers, Richard
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