subtle weirdness when you combine "_append" with "+="?

["Robert P. J. Day" <rpjday@crashcourse.ca>]

  was about to submit a small number of patches to clean up redundancy
when people combine "_append" with "+=" (because it offends my
delicate sensibilities), and ran across this in oe-core,
unfs3_0.9.22.r497.bb:

  DEPENDS_append_class-nativesdk += "flex-nativesdk"

uh, what?

  most of the time, i assume the above doesn't hurt, it's just ...
silly. but normally, with "_append", you *need* to add the leading
space explicitly, and that's not being done above. so does that mean
that combining "_append" with "+=" *does* generate a leading space?
that just makes my head hurt -- the possibility that "_append" is
being used in a way that normally makes it fail, only to have "+="
step in and save the day. at which point "_append" saves processing
that until the end of parsing? yeesh.

  thoughts?

rday

-- 

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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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