message: Ignore format truncation warning on utf8printf.cpp
  * We deliberately truncate in some tests, to check our printf behaves
  correctly.
diff: @@ -211,6 +211,9 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR APPLE)
  if(CMAKE_COMPILER_IS_GNUCXX)
  set_property(SOURCE 3rdparty/jpeg-compressor/jpgd.cpp
  APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-unknown-warning -Wno-implicit-fallthrough")
  +
  + set_property(SOURCE serialise/utf8printf.cpp
  + APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-unknown-warning -Wno-format-truncation")
  endif()
  endif()
  