myvtm/Other/unix/virtualcam/CMakeLists.txt

set(TARGET_NAME "virtualcam")

# 设置内核源代码路径
execute_process(
  COMMAND uname -r
  OUTPUT_VARIABLE KERNEL_VERSION
  OUTPUT_STRIP_TRAILING_WHITESPACE
)

message(STATUS "Current kernel version: ${KERNEL_VERSION}")
set(KERNEL_DIR /usr/src/linux-headers-${KERNEL_VERSION})
message(STATUS "KERNEL_DIR: ${KERNEL_DIR}")

# 定义编译函数/方法，驱动编译过程主要在这个函数进行
function(compile_module obj)
  #set(TARGET_NAME ${obj})
  # 添加目标，obj即为模块名称
  add_custom_target(${TARGET_NAME} ALL cp -f ${CMAKE_CURRENT_SOURCE_DIR}/*.c ${CMAKE_CURRENT_BINARY_DIR}/
			COMMAND cp -f ${CMAKE_CURRENT_SOURCE_DIR}/*.h ${CMAKE_CURRENT_BINARY_DIR}/
  			COMMAND echo "compiling module ${obj}.ko..."
  		    )

  # 设置依赖
  set(depend_objlist "v4l2loopback.o")
  
  # 设置编译命令
  add_custom_command(TARGET ${TARGET_NAME}
		     POST_BUILD
		     COMMAND echo "obj-m := ${obj}.o" > ${CMAKE_CURRENT_BINARY_DIR}/Makefile
		     COMMAND echo "${obj}-objs:=${depend_objlist}" >>${CMAKE_CURRENT_BINARY_DIR}/Makefile
		     COMMAND make -C ${KERNEL_DIR} M=${CMAKE_CURRENT_BINARY_DIR} modules
		     )
endfunction()

# 调用编译函数
compile_module(virtualcam)
message(STATUS "TARGET_NAME: ${TARGET_NAME}")
message(STATUS "CMAKE_CURRENT_BINARY_DIR: ${CMAKE_CURRENT_BINARY_DIR}")

#install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}.ko 
#       DESTINATION "${RVC_RUNTIME_PATH}")