最近在做LDD書上的一些例子, 為了統一管理程式碼的編譯,使核心模組的編譯跟應用程式的編譯過程一致,決定使用CMake來做工程的編譯,編譯指令碼如下:

cmake_minimum_required(VERSION 2.8)
project(ldd)

set(KERNEL_DIR /usr/src/linux-headers-3.2.0-48-generic-pae)

function(compile_module obj)
  set(TARGET_NAME ${obj})
  add_custom_target(${TARGET_NAME} ALL cp -f ${CMAKE_CURRENT_SOURCE_DIR}/*.c ${CMAKE_CURRENT_BINARY_DIR}/
  		    COMMAND echo "compiling module ${obj}.ko..."
  		    )
  list(LENGTH ARGN argn_len)
  set(i 0)
  set(depend_objlist "")
  while( i LESS ${argn_len})  
	list(GET ARGN ${i} argn_value)  
	set(depend_objlist "${depend_objlist} ${argn_value}.o") 
	math(EXPR i "${i} + 1")  
  endwhile() 
  
  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()

add_subdirectory(chapter02)
 

compile_module(hello)

如果該模組由多個模組構成,則可寫成

compile_module(hello  depend1 depend2 ...)