Solaris 11 buildbots

[Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>]

Prompted by a couple of gdb build failures in the past and Tom's message

	https://sourceware.org/ml/gdb-patches/2018-09/msg00027.html

I intend to set up gdb buildbots running on Solaris 11.4.  The current
plan is to have two buildslaves, one running on Solaris 11.4/SPARC, the
other on Solaris 11.4/x86.  I'll certainly run them to build
sparcv9-sun-solaris2.11 and amd64-pc-solaris2.11 configurations testing
64-bit debugging; if it works out reasonably well, I mean to add 32-bit
testing as well.  I don't currently plan to test i386-pc-solaris2.11 or
sparc-sun-solaris2.11 (i.e. a 32-bit gdb) or Solaris 10: the latter is
close to it's end of life and I expect to remove gcc support for that
target in about a year or two.  Besides, I don't have hosts sufficiently
secured to run buildbots there.

As mentioned in the thread above, the target isn't in the best of shapes
right now, with close to 2000 failures and 200+ racy tests, mostly in
gdb.threads.  The latter may have to be filtered out to avoid large
amounts of useless noise.  However, the buildbot will at least be able
to detect build failures early on.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University