clang-8.0 very strict

[Ken Cunningham]

FYI clang-8.0, new default on 10.6.8, is very strict

appears will have to add to blacklist on many ports
or otherwise surgerize code/standard setting — eventually will have to happen but all at once is daunting

downgrading default compiler on 10.6.8 to clang-5.0 gets the rev-upgrade done

once system is restored and working again will go back and try to start in on the clang-8.0 blacklisting

K