message: Enable -Werror on clang 6 and GCC9 builds
diff: @@ -45,7 +45,7 @@ matrix:
  packages:
  - clang-6.0
  env:
  - - MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
  + - MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0 -Werror"
  - os: linux
  @@ -71,7 +71,7 @@ matrix:
  packages:
  - g++-9
  env:
  - - MATRIX_EVAL="CC=gcc-9 && CXX=g++-9"
  + - MATRIX_EVAL="CC=gcc-9 && CXX=g++-9 -Werror"
  - os: linux
  