[OE-core] what is the precise search path for resolving "include" or "require" .inc files?

[Christopher Larson]

On Fri, Mar 11, 2016 at 5:08 AM Robert P. J. Day <rpjday at crashcourse.ca>
wrote:

>    not sure why i never noticed this before, but what is the search order
> or precedence or priority for resolving recipe file directives "include"
> or "require"? i was just perusing the bitbake user manual, and noticed
> the explanation that those directives use BBPATH to track down the first
> include file by a given name.
>
>    but AIUI, BBPATH is supposed to represent an ordered set of *layers*
> (i just examined BBPATH for a current [wind river linux] build, and that
> is exactly what it seems to contain). so when a recipe file like
> busybox.whatever.bb contains the line:
>
>    require busybox.inc
>
> i always just assumed the search would look in the current busybox
> directory, but that directory is not technically a layer directory --
> it's not a directory specified on the alleged BBPATH search path.
>
>    i never thought about this until i noticed some .bbappend files
> specifically using directives like:
>
>    require recipes-bsp/u-boot/u-boot.inc
>
> where that file reference *does* refer to a file relative to some
> actual layer directory somewhere.
>
>    what am i missing here?
>

BBPATH is temporarily prepended to include the directory the recipe lives
in, as a special case.

-Chris
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