[OE-core] [PATCH 3/6] Add new IMAGE_CLASSES variable for classes for image generation

[McClintock Matthew-B29882]

On Tue, Oct 4, 2011 at 5:03 PM, Matthew McClintock <msm at freescale.com> wrote:
> -inherit image_types
> +IMAGE_CLASESS ??= ""
> +inherit image_types ${IMAGE_CLASSES}

So this does not work properly, I thought I tested it but... need to
do something like this:

IMAGE_CLASSES = "image_types"
inherit ${IMAGE_CLASSES}

then let the user added via

IMAGE_CLASESS += "image_types_uboot"

then there will always be something that is expanded to avoid this issue:

ERROR: Could not inherit file classes/$IMAGE_CLASSES.bbclass
                           | ETA:  --:--:--
ERROR: Command execution failed: Exited with 1

or

ERROR: Could not inherit file classes/.bbclass
             | ETA:  --:--:--
ERROR: Command execution failed: Exited with 1

-M