[bug #15919] Make-3.81 rc1 hangs with -j 2 but not with -j 1

[Paul D. Smith]

Follow-up Comment #29, bug #15919 (project make):

I took a copy of glibc 2.9 and tried building it with -j10 on my uniprocessor
and on my dual core (actually single hyperthreading CPU) and it worked fine.

But when I took it to a 4-way hyperthreading (8 core) system and ran with
-j10 I did see some bad behavior: not hangs though.  Instead it seemed the
same recipe was being invoked >1 time which eventually caused the build system
to fail, because at the end of the recipe there's a job that removes a file. 
If the multiple recipes run in the "right" way then one of the instances
removes that file before the next one gets a chance to use it.

I'll look at this.

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