[meta-ti] curious about libdrm-2.4.41 recipe from meta-ti layer

[Maupin, Chase]

>-----Original Message-----
>From: meta-ti-bounces at yoctoproject.org [mailto:meta-ti-
>bounces at yoctoproject.org] On Behalf Of Robert P. J. Day
>Sent: Friday, July 18, 2014 6:47 AM
>To: meta-ti mailing list
>Subject: [meta-ti] curious about libdrm-2.4.41 recipe from meta-ti
>layer
>
>
>  i was perusing a number of yocto layers looking for cool
>examples to
>use in an upcoming class and ran across this oddity in the meta-ti
>layer:
>
>recipes-graphics/drm/libdrm_2.4.41.bb:
>  FILESEXTRAPATHS_append := ":${COREBASE}/meta/recipes-
>graphics/drm/libdrm"
>
>  in all of the layers i've looked at, that is the only example of
>*appending* to FILESEXTRAPATHS i've ever seen, so i thought i'd
>look
>closer to see what was going on.
>
>  even though oe-core defines a libdrm recipe file, the meta-ti
>layer
>doesn't use a bbappend for its version. rather, it explicitly adds
>the
>libdrm/ directory from oe-core using a reference to ${COREBASE},
>then
>adds its own files. that's valid, i guess, it just looks weird and
>is
>the only time i've ever seen that.

The recipe also defines using a TI version of libdrm (I don't like that but it is what we have been given from the component team doing this).  So the intent here is to:

1. Define a libdrm that uses the TI modified sources.
2. Use the recipe only for the omap-a15 devices and make that an explicit setting by setting default preference to -1.

This wasn't done as an append because we wanted this only for omap-a15 devices when explicitely set as the preferred version to use and not impact other devices using the later version from oe-core.

As for the reference to COREBASE it is to pick up the GNU_SOURCE_definition.patch file rather than overlaying that as well.

>
>  i'm also puzzled that the meta-ti recipe sets:
>
>DEFAULT_PREFERENCE = "-1"
>
>what's that for?  given that the oe-core layer already defines a
>recipe for libdrm that has a higher version number, why would the
>above line be necessary?
>
>  just trying to understand the rationale behind this unusual
>construction.
>
>rday
>
>--
>
>==================================================================
>======
>Robert P. J. Day                                 Ottawa, Ontario,
>CANADA
>                        http://crashcourse.ca
>
>Twitter:
>http://twitter.com/rpjday
>LinkedIn:
>http://ca.linkedin.com/in/rpjday
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