bitbake

Once we have removed an item from a BitBake variable, we cannot re-append it. The evaluation of the following three assignments of the variable BB_VAR yields the same result, no matter in which order the assignments are executed.

# Code under someone else's control
BB_VAR ?= "x z"
BB_VAR:remove = "a y"

# Code under our control
BB_VAR:append = " y"

### Result: BB_VAR = "x z" instead of "x y z"