Follow-up Comment #3, bug #59490 (project make):
Your attached makefile shows the issue you're trying to get at, but the
example in your question is incomplete: it's missing the fact that (a) you run
"make d1" and (b) the file "c1" must already exist before the makefile runs.
If "c1" doesn't
Follow-up Comment #2, bug #59490 (project make):
Greg, you observe the effect of make fs cache.
In order to avoid this effect you need to tell make explicitly that c1 is to
be rebuilt when b1 changes.
e.g.
b1: a1
touch b1
c1: b1
touch c1
d1: c1
touch d1
Follow-up Comment #1, bug #59490 (project make):
though maybe it's not so simple? e.g., if b is remade, but c doesn't change,
then probably d shouldn't change.
i guess my naive hope/expectation is that b will be remade, then c's date/time
will be compared with that of d to decided if d should
