On 2014-06-13 07:08, Patrick Doyle wrote:
OK, I've got to ask this, because it totally confuses me. I wrote a
recipe to build a custom application (gstreamer plugin, actually) that
I wanted to fetch from our SCM. Bitbake told me I needed to specify a
source revision and even gave me a clue of what to put in. Looking at
the development manual, I decided I wanted to use the latest revision
from our repository by default, so I added the following line to my
recipe:
SRCREV_default_pn-gstxbac = "${AUTOREV}"
But now I'm curious. Why couldn't I use (I haven't tried this yet)
SRCREV_pn-gstxbac ?= "${AUTOREV}"
If this is in the gstxbac recipe itself, use the much simpler
SRCREV ?= "${AUTOREV}"
and even more confusingly, why isn't the syntax something more like:
SRCREV_pn-gstxbac_default = "${AUTOREV}"
What's going on here?
Does one syntax (BLAH_default vs BLAH ?=) get evaluated early in the
bitbake process and the other get evaluated late?
Does the location of the letters "default" in a variable name matter?
At some point, I really need to wrap my head around Bitbake, it's
syntax, and how it operates and internalize all of that.
--
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Gary Thomas | Consulting for the
MLB Associates | Embedded world
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