message: g++ 4.8 still doesn't work under osx... see this build:
  it can't compile normal c++ code - getting errors like this: "/var/folders/vy/rcv48w3j4w79llzf_x6qnvw40000gn/T//ccCv7a2K.s:113:expecting string instruction after `rep'"
  also g++ 6 builds fail because of bugs in the sanitizers...
diff: @@ -257,6 +257,12 @@ matrix:
  # for some reason some of these builds fail sometimes...
  + # OSX GCC 4.8
  + - env: COMPILER=g++-4.8 HAS_ASAN_32=true HAS_ASAN_64=true
  + compiler: gcc
  + osx_image: xcode6.4
  + os: osx
  +
  # OSX GCC 6
  - env: COMPILER=g++-6 HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true
  compiler: gcc
  