已经大半个月没有更新文章了，大家还记得之前作者写的一篇关于RT-Thread的微内核移植的文章吗？如果不记得没关系。看如下是文章链接。
《如何移植RTT微内核到树莓派3B》
《CMake，大型项目采用的构建工具》
《CMake 静态库与动态库构建》
《CMake 教你如何链接共享库》
cmake_minimum_required(VERSION 3.10)set(CMAKE_SYSTEM_NAME Generic)set(CMAKE_SYSTEM_PROCESSOR arm)set(CONFIG_PREFIX "/opt/gcc-arm-none-eabi/bin/arm-none-eabi-")set(CMAKE_C_COMPILER "${CONFIG_PREFIX}gcc")set(CMAKE_CXX_COMPILER "${CONFIG_PREFIX}g++")set(CMAKE_ASM_COMPILER "${CONFIG_PREFIX}gcc")set(CMAKE_OBJCOPY "${CONFIG_PREFIX}objcopy")set(CMAKE_C_AR "${CONFIG_PREFIX}ar")set(CMAKE_SIZE "${CONFIG_PREFIX}size")#Disable compiler checksset(CMAKE_C_COMPILER_FORCED TRUE)set(CMAKE_CXX_COMPILER_FORCED TRUE)set(microkernel_sdk_dir "${CMAKE_SOURCE_DIR}/sdk")set(microkernel_apps_dir "${CMAKE_SOURCE_DIR}/apps")project(rtt_microkernel)enable_language(C ASM)add_definitions("-D__ASSEMBLY__""-DRT_USING_NEWLIB""-DHAVE_CCONFIG_H""-D__STDC_ISO_10646__=201206L""-D_STDC_PREDEF_H")set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv7-a -marm -msoft-float -Werror -Wall -O0 -g -gdwarf-2 -n -pie -fpie -fPIC -fpic --static -nostdinc")set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} -march=armv7-a -marm -msoft-float -x assembler-with-cpp -O0 -g -fPIC")set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv7-a -marm -msoft-float -Werror -Wall -Woverloaded-virtual -fno-exceptions -fno-rtti -O0 -g -gdwarf-2 -n -pie -fpie -fPIC -fpic --static -nostdinc")set(CMAKE_EXE_LINKER_FLAGS "-march=armv7-a -marm -msoft-float -nostartfiles -nostdlib -n -pie -fpie -fPIC -fpic -Wl,-pie")set(microkernel_sdk_inc"${CMAKE_SOURCE_DIR}""${microkernel_sdk_dir}/crt/rt-thread/components/dfs""${microkernel_sdk_dir}/crt/rt-thread/components/drivers""${microkernel_sdk_dir}/crt/rt-thread/components/net""${microkernel_sdk_dir}/crt/rt-thread/components/net/netdev""${microkernel_sdk_dir}/crt/rt-thread/components/lwip-2.1.0""${microkernel_sdk_dir}/crt/rt-thread/include""${microkernel_sdk_dir}/crt/rt-thread/include/libc""${microkernel_sdk_dir}/crt/gcc""${microkernel_sdk_dir}/libc/include")set(microkernel_apps_inc"${microkernel_apps_dir}/hello")set(microkernel_sdk_src"${microkernel_sdk_dir}/crt/cplusplus/cxx_crt.cpp""${microkernel_sdk_dir}/crt/gcc/arch/arm/syscall.S""${microkernel_sdk_dir}/crt/rt-thread/src/rt_channel.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_completion.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_device.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_ipc.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_net.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_syscall.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_thread.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_timer.c""${microkernel_sdk_dir}/crt/rt-thread/src/stub.c")set(microkernel_apps_src"${microkernel_apps_dir}/hello/main.c")set(CMAKE_EXECUTABLE_SUFFIX ".elf")add_executable(${PROJECT_NAME} ${microkernel_apps_src} ${microkernel_sdk_src})target_include_directories(${PROJECT_NAME} PRIVATE ${microkernel_sdk_inc} ${microkernel_apps_inc})target_link_libraries(${PROJECT_NAME}PRIVATE-Wl,--start-group"${CMAKE_SOURCE_DIR}/sdk/libc/lib/libc.a""${CMAKE_SOURCE_DIR}/sdk/libc/lib/libm.a""${CMAKE_SOURCE_DIR}/sdk/libc/lib/libcrt.a""libgcc.a"-Wl,--end-group-T ${microkernel_sdk_dir}/crt/gcc/arch/arm/gcc_arm.ld)
cmake_minimum_required(VERSION 3.10)CMAKE_SYSTEM_NAME：这个变量被设置，cmake才认为采用交叉编译，CMAKE_SYSTEM_NAME即目标机target所在的操作系统名称，比如ARM或者Linux你就需要写”Linux”,如果Android平台你就写”Android”,如果你的嵌入式平台没有相关OS你即需要写成”Generic”。
set(CMAKE_SYSTEM_NAME Generic)set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_C_COMPILER_FORCED TRUE)set(CMAKE_CXX_COMPILER_FORCED TRUE)
set(microkernel_sdk_dir "${CMAKE_SOURCE_DIR}/sdk")set(microkernel_apps_dir "${CMAKE_SOURCE_DIR}/apps")
project(rtt_microkernel)enable_language(C ASM)add_definitions("-D__ASSEMBLY__""-DRT_USING_NEWLIB""-DHAVE_CCONFIG_H""-D__STDC_ISO_10646__=201206L""-D_STDC_PREDEF_H")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv7-a -marm -msoft-float -Werror -Wall -O0 -g -gdwarf-2 -n -pie -fpie -fPIC -fpic --static -nostdinc")set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} -march=armv7-a -marm -msoft-float -x assembler-with-cpp -O0 -g -fPIC")set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv7-a -marm -msoft-float -Werror -Wall -Woverloaded-virtual -fno-exceptions -fno-rtti -O0 -g -gdwarf-2 -n -pie -fpie -fPIC -fpic --static -nostdinc")set(CMAKE_EXE_LINKER_FLAGS "-march=armv7-a -marm -msoft-float -nostartfiles -nostdlib -n -pie -fpie -fPIC -fpic -Wl,-pie")
set(microkernel_sdk_inc"${CMAKE_SOURCE_DIR}""${microkernel_sdk_dir}/crt/rt-thread/components/dfs""${microkernel_sdk_dir}/crt/rt-thread/components/drivers""${microkernel_sdk_dir}/crt/rt-thread/components/net""${microkernel_sdk_dir}/crt/rt-thread/components/net/netdev""${microkernel_sdk_dir}/crt/rt-thread/components/lwip-2.1.0""${microkernel_sdk_dir}/crt/rt-thread/include""${microkernel_sdk_dir}/crt/rt-thread/include/libc""${microkernel_sdk_dir}/crt/gcc""${microkernel_sdk_dir}/libc/include")set(microkernel_apps_inc"${microkernel_apps_dir}/hello")
set(microkernel_sdk_src"${microkernel_sdk_dir}/crt/cplusplus/cxx_crt.cpp""${microkernel_sdk_dir}/crt/gcc/arch/arm/syscall.S""${microkernel_sdk_dir}/crt/rt-thread/src/rt_channel.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_completion.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_device.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_ipc.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_net.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_syscall.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_thread.c""${microkernel_sdk_dir}/crt/rt-thread/src/rt_timer.c""${microkernel_sdk_dir}/crt/rt-thread/src/stub.c")set(microkernel_apps_src"${microkernel_apps_dir}/hello/main.c")
set(CMAKE_EXECUTABLE_SUFFIX ".elf")add_executable(${PROJECT_NAME} ${microkernel_apps_src} ${microkernel_sdk_src})target_include_directories(${PROJECT_NAME} PRIVATE ${microkernel_sdk_inc} ${microkernel_apps_inc})target_link_libraries(${PROJECT_NAME}PRIVATE-Wl,--start-group"${CMAKE_SOURCE_DIR}/sdk/libc/lib/libc.a""${CMAKE_SOURCE_DIR}/sdk/libc/lib/libm.a""${CMAKE_SOURCE_DIR}/sdk/libc/lib/libcrt.a""libgcc.a"-Wl,--end-group-T ${microkernel_sdk_dir}/crt/gcc/arch/arm/gcc_arm.ld)
编译测试：
如上是整个测试以及CMakeLists.txt讲解。有疑问，请私聊作者。
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