LIBRARY_OUTPUT_DIRECTORY 目标属性指定将构建库目标文件的目录.

The LIBRARY_OUTPUT_DIRECTORY target property specifies the directory where library target files will be built.

set_target_properties(JE3D PROPERTIES
         LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/out/library)

如果所有库都在一个目录中，我发现设置 CMAKE_LIBRARY_OUTPUT_DIRECTORY 变量更方便，该变量用于在创建目标时初始化 LIBRARY_OUTPUT_DIRECTORY 属性.

If all the libraries are in one directory, I find it more convenient to set the CMAKE_LIBRARY_OUTPUT_DIRECTORY variable, which is used to initialize the LIBRARY_OUTPUT_DIRECTORY property when creating a target.

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/out/library)

如果您的目标是静态库，请检查评论

Check comments if your target is a static library