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I have been messing around using parallel makefiles and it seemed to be
working fine until I tried passing a define (-D) through to a second
makefile.

A stripped down example demonstrates this...

>>> Master makefile:
all:
    cd subdir && make -j 4

If I just run the make without any parameters it runs perfectly and 4 jobs
are performed in parallel.

If however I run it as follows, it only runs one job at a time:
make -DSOME_DEFINE

For some reason, passing in the define seems to negate the "-j 4" and I
can't work out why. Is this a bug or a feature? :)

Any pointers would be appreciated,
 Stuart

PS. I have attached a sample directory structure which illustrates this







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