message: compiler_flags: add -Weffc++
  I want to add the effc++ warning because we had a bug where a member
  variable was not initalized and this resulted in random behavior.
  Really, this is something that the compiler should catch, no matter
  what!
diff: @@ -10,7 +10,7 @@ else()
  # We are not using exceptions to make it easier to write wrappers.
  add_definitions(-fno-exceptions)
  - set(warnings "-Wall -Wextra -Werror -Wshadow -Wno-strict-aliasing -Wold-style-cast -Wdouble-promotion -Wformat=2")
  + set(warnings "-Wall -Wextra -Werror -Wshadow -Wno-strict-aliasing -Wold-style-cast -Wdouble-promotion -Wformat=2 -Weffc++")
  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6)
  