message: fixing gcc 4.8 & 4.9 builds after merging
diff: @@ -138,6 +138,10 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
  add_compiler_flags(-Wnoexcept)
  endif()
  + if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
  + add_compiler_flags(-Wno-missing-field-initializers)
  + endif()
  +
  # no way to silence it in the expression decomposition macros: _Pragma() in macros doesn't work for the c++ front-end of g++
  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55578
  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69543
  