CMake学习笔记02--典型的CMake工程组织结构

首先是系统编译工具链环境的搭建

 cmake/function.cmake

function(add_object_lib target include_dirs compile_definitions compile_options sources) 
    add_library(${target} OBJECT ${sources})
    target_include_directories(${target} PRIVATE ${include_dirs}) 
    target_compile_definitions(${target} PRIVATE ${compile_definitions}) 
    target_compile_options(${target} PRIVATE ${compile_options})
endfunction()

function(add_object_lib_CXX target include_dirs CXX_compile_definitions CXX_compile_options sources) 
    add_library(${target} OBJECT ${sources})
    target_include_directories(${target} PRIVATE ${include_dirs})
	target_compile_definitions(${target} PRIVATE $<$<COMPILE_LANGUAGE:CXX>:${CXX_compile_definitions}>)
	target_compile_options(${target} PRIVATE $<$<COMPILE_LANGUAGE:CXX>:${CXX_compile_options}>)
endfunction() 

function(set_shared_lib target link_options output_dir)
    set_target_properties(${target} PROPERTIES LINK_FLAGS ${link_options}) 
	set_target_properties(${target} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${output_dir})
	set_target_properties(${target}  PROPERTIES DEFINE_SYMBOL "")
	set_target_properties(${target}   PROPERTIES NO_SONAME 1)
endfunction()

function(set_static_lib target link_options output_dir)
    set_target_properties(${target} PROPERTIES LINK_FLAGS ${link_options}) 
	set_target_properties(${target} PROPERTIES ARCHIVE_OUTPUT_DIRECTORY ${output_dir})
	#set_target_properties(${target}  PROPERTIES DEFINE_SYMBOL "")
	#set_target_properties(${target}   PROPERTIES NO_SONAME 1)
endfunction()

cmake/includedir.cmake

set(include_dirs
#包含工程所需的头文件
)

主工程CMakeLists.txt

cmake_minimum_required(VERSION 3.12.1)
project(xxxx)

#set the path
set(SDK_DIR  			${CMAKE_CURRENT_SOURCE_DIR})
set(SO_OUTPUT_DIR 		${SDK_DIR}/output)
message("==== source_dir:${CMAKE_CURRENT_SOURCE_DIR}")

#=============include the function defined=================#
include(cmake/function.cmake)

#====================seleted which chip is compiled=================#
if(${CHIP_TYPE} STREQUAL xxxxx)
	#printf the debug info
	message("======the chip selected is ${target_xxxx}======")
	#set the including header file
	include(cmake/xxxx.cmake)
	set(output_dir ${SO_OUTPUT_DIR}/${CHIP_TYPE})
	if(${RTOS_VERSION} STREQUAL xxxx)
		set(target_xxxx xxxxx)
		message("======the RTOS selected is xxxx======")	
	elseif(${RTOS_VERSION} STREQUAL xxxx)
		set(target xxxxx)
		message("======the RTOS selected is xxxx======")	
	elseif(${RTOS_VERSION} STREQUAL xxxxx)
		set(target xxxxxx)
		message("======the RTOS selected is xxxxxx======")	
	endif()
	#set the compile options
		set(compile_definitions -Dxxxxx)
	if(${SO_TYPE} STREQUAL static)
		set(compile_options  xxxxx)
		set(link_options xxxx)
		add_library(${target_xxx} STATIC $<TARGET_OBJECTS:xxx-sdk>)
		add_subdirectory(cmake)
		set_static_lib(${target_xx} "${link_options}" "${output_dir}")
	else()
		set(compile_options  xxxx)
		set(link_options xxxx)
		add_library(${target_xxx} SHARED $<TARGET_OBJECTS:xxx-sdk>)
		add_subdirectory(cmake)
		set_shared_lib(${target_xxx} "${link_options}" "${output_dir}")
	endif()
endif()

cmake文件夹下的CMakeLists.txt

add_subdirectory(xxx)

objlib的cmake/xxx/CMakeLists.txt

set(xxxx_sources
xxx.c
xxx.c
)
add_object_lib(xxx-sdk "${include_dirs}" "${compile_definitions}" "${compile_options}" "${xxxx_sources}")

gcc_tool_chain.cmake

set(CMAKE_SYSTEM_NAME Linux)

set(CMAKE_SYSTEM_PROCESSOR arm)

set(CMAKE_C_COMPILER  arm-linux-gnueabi-gcc)

set(CMAKE_CXX_COMPILER  arm-linux-gnueabi-g++)

set(CMAKE_SKIP_BUILD_RPATH TRUE)

set(CMAKE_C_COMPILE_OBJECT "<CMAKE_C_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>  -c <SOURCE>")

cmake指令

cmake -DCMAKE_TOOLCHAIN_FILE="$BUILD_DIR"/../cmake/gcc_tool_chain.cmake ../.. \
	      -DCHIP_TYPE="$1" \
		  -DRTOS_VERSION="$2" \
		  -DSO_TYPE="$4" \
		  -Dcdk_include="$cdk_include"

最后就是make执行编译