When using

  DEPENDS:append = " something"

in a recipe that uses BBCLASSEXTED += "native", the generated DEPENDS list (after parsing the -native variant) will contain both "something-native" as well as "something".

(The latter is then an unexpected target dependency in a -native recipe.)

What should happen instead is that the override (:append) gets cleared during `map_dependencies()` of native.bbclass. Instead, it is applied twice (once during native mapping, and again at the finalization of DEPENDS).

That the appends are not cleared is caused by 

   d.setVar(varname, " ".join(newdeps), parsing=True)

being called with 'parsing=True' introduced by https://git.yoctoproject.org/poky/commit/meta/classes/native.bbclass?id=c4257ed8b1040a5a0e9a95846d81961741239116.

While not clearing overrides is valid for *conditional* overrides, it is not for *unconditional* ones.

However, at the moment there is no bitbake API allowing us to differentiate this.

One possible solution to this mentioned by RP in #yocto is implementing 'filters' as proposed by JPEW: https://git.yoctoproject.org/poky-contrib/log/?h=jpew/bb-filters