the updated docker image is having problems with clang-3.7. It seems that now the package process is adding *-fdebug-prefix-map* and that is not supported in clang-3.7 [0] [1]

clang: error: unknown argument: '-fdebug-prefix-map=/code=.'

So I'm moving to clang-3.8 in the stretch version and to clang-3.9 in the sid one