In a Bitbake recipe file (.bb), I have the following assignments:
FILES_${PN} += "/usr/lib/some_lib"
+FILES_${PN} += "${sysconfdir}/*"
FILES_${PN} += "/var/spool/foo/bar"
The second line has a plus sign before the variable name being assigned.
Tried searching for it in the Bitbake Manual, Google and even ChatGPT, but it seems to be understanding it as the append operator (+=) instead of the use I have here. I also thought of it being a typo, but Bitbake process the recipe, so I think it actually has a meaningful use.
What is the purpose of it?
Does it have a special name so one can actually search for it in documentation?