Furthermore, the whole idea of the toplevel configure tentative_cc
setting code is dubious since this is an autoconf-generated script and
it's autoconf's job to deal with finding a working compiler, putting
it in ANSI C mode, etc. - so if someone did wish to resupport one of
these hosts (and in the unlikely event that building current tools
using the old system compiler is at all possible) it would be better
to put system-specific pieces in autoconf and make toolchain configure
code work using features not host triplet tests as far as possible.