message: CI: make sure all libraries that use exceptions declare so.
diff: @@ -18,6 +18,11 @@ set -e
  source ./.github/settings.sh
  +# Make sure we don't have cc_library rules that use exceptions but do not
  +# declare copts = ["-fexceptions"] in the rule. We want to make it as simple
  +# as possible to compile without exceptions.
  +BAZEL_OPTS="${BAZEL_OPTS} --cxxopt=-fno-exceptions"
  +
  # Turn warnings to 11. And fail compliation if we encounter one.
  BAZEL_OPTS="${BAZEL_OPTS} --cxxopt=-Werror" # Always want bail on warning
  BAZEL_OPTS="${BAZEL_OPTS} --cxxopt=-Wall --cxxopt=-Wextra"
  