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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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