[yocto] do any yocto docs clearly distinguish between "+=" and "_append"?

[Robert P. J. Day]

  still slogging my way through the dev manual, and here:

http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#usingpoky-extend-customimage

section 5.2.1 recommends that recipe files use:

IMAGE_INSTALL += "strace"

while, further down in section 5.2.4, developers are encouraged to add
to their personal local.conf:

IMAGE_INSTALL_append = " strace"

  is there somewhere in a yocto doc a clear explanation of the proper
usage of "+=" versus "_append"? because, in my experience, that's a
point of serious confusion for new users.

rday

-- 

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

Twitter:                                       http://twitter.com/rpjday
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