cmake_examples

基本知识：

include(${CMAKE_SOURCE_DIR}/cmake/cmaketools.cmake)

include类似于C语言的include 展开

子工程add_subdirectory 比好用 include 

 

静态库：

//源文件

aux_source_directory(. DATASTREAMING_SRC)

//静态库可执行文件到工程中

add_library(${DATASTREAM_LIB_NAME} STATIC ${DATASTREAMING_SRC})

//头文件

target_include_directories(${DATASTREAM_LIB_NAME} PRIVATE ${ALL_INCLUDE_DIRS})

 

 

可执行文件：

set(TARGETS TnMapDataAccessRegex)

//依赖库路径声明在executable之前

link_directories(

    ${PROJECT_SOURCE_DIR}/../../lib/server

    ${PROJECT_SOURCE_DIR}/../../lib/someip

)

 //源文件

aux_source_directory(${CMAKE_SOURCE_DIR}/regex REGEX_SOURCE_FILES)

aux_source_directory(${CMAKE_SOURCE_DIR}/regex/dumper REGEX_DUNPER_SOURCE_FILES)

//添加可执行文件到工程中

add_executable( ${TARGETS}

                ${REGEX_SOURCE_FILES}

                ${REGEX_DUNPER_SOURCE_FILES}

)

//链接库，依赖顺序参照gcc     

target_link_libraries(${TARGETS}

    ${MAP_DATA_ACCESS_LIB_NAME}

    ${MAP_DATA_ACCESS_DEPEND_LIBS}

)

 //头文件目录

target_include_directories(${TARGETS}

                            PRIVATE

                            ${ALL_INCLUDE_DIRS}

                            )

//定义宏

target_compile_definitions(${TARGETS} PRIVATE ${MAP_DATA_ACCESS_COMMON_DEFINITION})

 

 

交叉编译：

    # aarch64

    if(COMPILE_AARCH64)

        set(CMAKE_SYSTEM_NAME Linux)

        

        set(TOOLCHAIN_PATH "/opt/poky/2.4.3/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux")

        set(CMAKE_C_COMPILER ${TOOLCHAIN_PATH}/aarch64-poky-linux-gcc)

        set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PATH}/aarch64-poky-linux-g++)

        set(CMAKE_AR ${TOOLCHAIN_PATH}/aarch64-poky-linux-ar)

        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=/opt/poky/2.4.3/sysroots/aarch64-poky-linux -Wall -Wno-unused-but-set-variable -Werror")

        

        include_directories("/opt/poky/2.4.3/sysroots/aarch64-poky-linux/usr/include")

        link_directories(

            #"${KANZIDIR}/Engine/lib/linux_wsegl_aarch64_gcc72/ES3_Release"

            #"${KANZIDIR}/Engine/libraries/platforms/linux-aarch64/libunibreak/lib"

        )

    #linux x86_64

    else()

        #link_directories("${KANZIDIR}/Engine/lib/linux_x11_glx_cpp98/GL_Debug")

    endif()

 

 链接动态库

1.编译期：

　　可执行程序/动态库A 需要链接动态库B.so的时候，需要的B的路径+库的名字。

　　隐式链接：A需要在B.so的导出符号表里找到需要的符号是否存在，A会保存B的名字（这个ldd命令，elf文件，PE文件都能证明确实保存了）

2.运行期：

       A 根据环境变量或者/lib或者当前目录等措施知道B所在的路径，再用类似dlopen系列操作系统API加载B到虚拟地址空间，并且把地址为0的符号找到真实的符号地址。

      Windows 的坑：.lib不一定是静态库

 

 在线学习网站

Introduction to CMake by Example | derekmolloy.ie

Learn CMake's Scripting Language in 15 Minutes

 

Option 3:

set(CMAKE_C_COMPILER "/path/to/your/c/compiler/executable")
set(CMAKE_CXX_COMPILER "/path/to/your/cpp/compiler/executable")

Edit the CMakeLists.txt file of "Assimp": Add these lines at the top (must be added before you use project() or enable_language() command)