The below makefile snippet works as supposed in single-job mode, however
in parallel mode under certain timing circumstances although it makes
the prerequisites for each of the rules, it then decides not to run the
commands, for the most part.
all rev: xyz.lib
@echo - in $<:
@cat $<
@rm -f xyz.*
xyz.lib:: xyz.1.o
echo - $^ >> $@
xyz.lib:: xyz.2.o
echo - $^ >> $@
xyz.lib:: xyz.3.o
echo - $^ >> $@
xyz.%.o:
sleep $N
echo hi > $@
R1 = 3
R2 = 2
R3 = 1
all: N=$*
rev: N=$(R$*)
$ make -j3 rev
sleep 3
sleep 2
sleep 1
echo hi > xyz.3.o
echo hi > xyz.2.o
echo hi > xyz.1.o
echo - xyz.1.o >> xyz.lib
- in xyz.lib:
- xyz.1.o
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