message: Fix for mac os dirty compilers
diff: @@ -87,15 +87,15 @@ matrix:
  - os: osx
  osx_image: xcode8
  env:
  - - MATRIX_EVAL="brew install gcc5 && CC=gcc-5 && CXX=g++-5"
  + - MATRIX_EVAL"brew update && brew upgrade && brew install gcc5 && CC=gcc-5 && CXX=g++-5"
  - os: osx
  osx_image: xcode8
  env:
  - - MATRIX_EVAL="brew install gcc6 && CC=gcc-6 && CXX=g++-6"
  + - MATRIX_EVAL="brew update && brew upgrade && brew install gcc6 && CC=gcc-6 && CXX=g++-6"
  - os: osx
  osx_image: xcode8
  env:
  - - MATRIX_EVAL="brew install gcc && CC=gcc-7 && CXX=g++-7"
  + - MATRIX_EVAL="brew update && brew upgrade && brew install gcc && CC=gcc-7 && CXX=g++-7"
  before_install:
  - eval "${MATRIX_EVAL}"
  