Update common/cmake/clang.cmake

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: stefanatwork

common/cmake/clang.cmake

@@ -84,7 +84,7 @@ ELSE()
   OPTION(EMBREE_ADDRESS_SANITIZER "Enabled CLANG address sanitizer." OFF)
   IF(EMBREE_IGNORE_CMAKE_CXX_FLAGS)
     IF(CMAKE_CXX_FLAGS)
-      MESSAGE(WARNING "Ignoring CMAKE_CXX_FLAGS because EMBREE_IGNORE_CMAKE_CXX_FLAGS is enabled.")
+      MESSAGE(WARNING "Ignoring CMAKE_CXX_FLAGS because EMBREE_IGNORE_CMAKE_CXX_FLAGS is enabled. Configure with EMBREE_IGNORE_CMAKE_CXX_FLAGS=OFF to honor CMAKE_CXX_FLAGS. Ignored value: '${CMAKE_CXX_FLAGS}'")
     ENDIF()
     SET(CMAKE_CXX_FLAGS "")
   ENDIF()