GNU Make 4.2.1
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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1. "foo" is simple variable.
so result have to be 100 but is 200
foo :=
val := 100
all : foo += $(val)
all :
@echo foo : $(foo)
val := 200
result is : 200
-------------------------------------------------------
2. If i change '+=' operator to ':=' then result is 100
foo :=
val := 100
all : foo := $(val)
all :
@echo foo : $(foo)
val := 200
result is : 100
----------------------------------
foo :=
val := 100
foo += $(val)
val := 200
$(info $(foo))
result is : 100
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