message: Disables warnings in about how sparsehash casts memory.
diff: @@ -130,6 +130,13 @@ if (AXOM_ENABLE_SPARSEHASH)
  target_include_directories(sparsehash INTERFACE
  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/thirdparty>)
  + # Disable warning introduced in gcc@8.1 related to how sparsehash casts memory
  + if(C_COMPILER_FAMILY_IS_GNU)
  + if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "8.1")
  + blt_add_target_compile_flags(TO sparsehash FLAGS "-Wno-class-memaccess")
  + endif()
  + endif()
  +
  install(TARGETS sparsehash
  EXPORT sparsehash-targets
  INCLUDES DESTINATION include)
  