[OE-core] proper use of CORE_IMAGE_EXTRA_INSTALL?

[Robert P. J. Day]

  followup to earlier post, it's easy enough to see the point of this
code from core-image.bbclass:

... snip ...

CORE_IMAGE_BASE_INSTALL = '\
    task-core-boot \
    task-base-extended \
    \
    ${CORE_IMAGE_EXTRA_INSTALL} \
    '

CORE_IMAGE_EXTRA_INSTALL ?= ""

IMAGE_INSTALL ?= "${CORE_IMAGE_BASE_INSTALL}"

... snip ...

  but i can see this snippet from
meta/recipes-graphics/images/core-image-gtk-directfb.bb:

... snip ...

inherit core-image

IMAGE_INSTALL += "\
        ${CORE_IMAGE_BASE_INSTALL} \
        task-core-basic \
        task-core-gtk-directfb-base \
"

... snip ...

  now this would seem to be exactly what the variable
CORE_IMAGE_EXTRA_INSTALL was invented for, no?  certainly the above
will work but then what's the point of having
CORE_IMAGE_EXTRA_INSTALL?

  however, if one used that, it's obvious that one would leave the
line "inherit core-image" to near the bottom of the .bb file, but
returning to my earlier question, what is the proper ordering of
setting CORE_IMAGE_EXTRA_INSTALL and inheriting core-image.  it's
clear "inherit core-image" would always work *after*, but what about
before?

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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