Follow-up Comment #14, bug #15919 (project make):
(comment by J. David Bryan, original submitter)
The patch from Icarus Sperry does fix the original problem. However, it
appears to introduce a new one.
I have taken the original make-3.81 sources and added the patch to produce
"make-381p". Then, with this makefile:
%.c : %.b
cp $< $@
%.b : %.a
cp $< $@
all : 1.c 2.c
...executing this command in an otherwise empty directory:
$ touch 1.a 2.a && make-381p -j 2
...produces this output:
cp 1.a 1.b
cp 2.a 2.b
cp 1.b 1.c
cp 2.a 2.b [ <-- NOTE ]
cp 2.b 2.c
rm 1.b 2.b
...whereas the stock make-3.81 with the same command produces:
cp 1.a 1.b
cp 2.a 2.b
cp 1.b 1.c
cp 2.b 2.c
rm 1.b 2.b
Note that the patched version copies 2.a to 2.b twice. Running the patched
version with "-j 1" produces the correct behavior.
I've confirmed this on sparc-sun-solaris2.9 as well as the x86 Win32
version.
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