[bug #27714] expansion of $(shell) in target forces serialization of targets

[Mike Frysinger]

Follow-up Comment #2, bug #27714 (project make):

i didnt think it a race condition because the original test case had a fairly
lengthy $(shell) code and the targets always ran in the same order (and
obviously only one cpu at a time -- the other cpus stayed idle)

using sleep shows that it is indeed a make bug.  i see one target show up
every 10 seconds:
$ cat makefile
t = 0 a b c 1 d e f 2 g h i 3 j k l 4 m n o 5 p q r 6
all: $(t) ; @echo
$(t): ; @printf $@ $(shell sleep 10)

$ make -f makefile
<10 seconds>0<10 seconds>a<10 seconds>b............

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