>> "CC+=-Os" in individual Makefiles works about as well as "CFLAGS+=-Os" for >> adding flags. That's not very well. Removing unwanted additions is hard.
>Why don't we have a -= operator in make(1)?
Substitution can replace -= in may cases, e.g.:
CC:= ${CC:S/-Os//}
This is "hard" because it has to be coded in the makefile, while additions
can be passed to make.
Bruce
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