solaris bootstrap problems

[Mike Stump]

I think I tracked down the solaris build problems.  It seems that the
libstdc++-v3 build isn't -j5 safe.  :-(  I tried a -j1 build and it
worked fine.

Could the libstdc++-v3 people ensure that there are enough
dependencies in the makefile?  I think there is some implicit
assumptions that other directories finish configuring before other
directories start configuring.  I think the fix is to serialize the
configuration of all the target directories.  I don't think autoconf
wants to manage a cache file from 5 configure runs that are running
simultaneously.

And no, you don't need a multi CPU machine to observe the breakage,
just make 3.79 and -j5.

Thanks.