opencv crosscompile:Unexpected CMake generator expression - c++

Question

When doing opencv cross-compilation for embedded devices, in order to use muslc c++, etc., I used this sentence in cmakelists.txt:
set(SYSTEM_LIBRARY_FOR_OPENCV
muslc
muslcsys
stdc++
supc++)
ocv_target_link_libraries(${the_module} PRIVATE
"$<BUILD_INTERFACE:${SYSTEM_LIBRARY_FOR_OPENCV}>")
Compilation can be successful, but there is such a warning:
CMake Warning at third_party/utils/opencv-4.6.0/cmake/OpenCVUtils.cmake:1675 (message):
Unexpected CMake generator expression: $<LINK_ONLY:$<BUILD_INTERFACE:muslc
Call Stack (most recent call first):
third_party/utils/opencv-4.6.0/CMakeLists.txt:1221 (ocv_get_all_libs)
I have verified that if you write directly like this:
ocv_target_link_libraries(${the_module} PRIVATE
"${SYSTEM_LIBRARY_FOR_OPENCV}")
it will appear error:
cmake error: includes target which requires target that is not in the export set
After searching, I didn't find any news related to this warning. Have you ever encountered it? How to eliminate it?
thanks