[bug #15757] circular variable_set_list causes hang on SunOS

[Ab Wilson]

Follow-up Comment #8, bug #15757 (project make):

I think you can rule out a heap management problem. I added a memset to
xmalloc (so all newly allocated memory is explicitly zeroed) and I get the
same behaviour.

Regarding OS differences. Yes there are differences. The structure of the
make system is based on defaults overridden by platform specifics - so I have
generic rules for C++ defined in make/share/c++.mk, these are overridden by
reading a platform specific file make/<platform>/c++.mk if it exists. The
same model is used to defined all "facilities" available. Is there anything
weird about them? Maybe, I'll think about it, but I don't think there are any
target specific variables involved.

NB The reason I'm using 3.81beta on Solaris is that 3.80 dumped core on these
makefiles, but I think at a different place.

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