Afaik `:=` evaluates the variable expression only once, does it evaluate it for
each module Makefile, or only for the first time that variable is assigned? I
mean, if module `a` and `b` have something like `BUILDER=...` in their
Makefile, a `make all` is going to evaluate `BUILDER` variable each time, or
the one from module `a` propagate to `b` compilation?
On the other hand `=` evaluates every time the variable is used.
GCC 4.4 is really old, I would avoid fixing warning for it if it can create
side effects by propagating values when not expecting.
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