Follow-up Comment #1, bug #43550 (project make):
"foo" in the Makefile refers to the directory "foo". Because the directory
has no prerequisites, it is considered up to date as long as it exists
(up-to-date means newer than all prerequisites).
In general, non-phony targets should update a single rule with same name as
the target, so what you probably want is:
foo/foo: foo/foo.cpp
g++ -o $@ $<
The $@ and $< are shorthand for the rule target and the first prerequisite,
respectively.
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