cmake编译报错 undefined reference to `xxx'

错误信息：F:/github/Demos/br_cmake_proj/Demos/CmakeProject2/main.cpp:11: undefined reference to `Module1A::Module1A()'

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错误根因：模块.cmake中对SOURCES误加$符。正确写法为list(APPEND SOURCES ${CMAKE_CURRENT_LIST_DIR}/Module1A.cpp)

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