libubox交叉编译到mipsel架构处理器MT7628/n(在Ubuntu系统下,编译出openwrt系统可运行库)

准备环境：

安装cmake

#sudo apt-get install cmake

1、libubox库依赖json-c库，所以需先下载 json-c.git 源码，并交叉编译

git clone https://github.com/json-c/json-c.git

注：json-c交叉编译可参考：libpcap的交叉编译过程。

2、下载libubox.git源码

git clone https://git.openwrt.org/project/libubox.git

3、修改CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
INCLUDE(CheckLibraryExists)
INCLUDE(CheckFunctionExists)

ADD_DEFINITIONS(-DJSONC)
SET(TOOLCHAIN_DIR "/usr/local/openwrt14.07/OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2/staging_dir/toolchain-mipsel_24kec+dsp_gcc-4.8-linaro_uClibc-0.9.33.2")
INCLUDE_DIRECTORIES(${TOOLCHAIN_DIR}/include/json-c)
INCLUDE_DIRECTORIES(${TOOLCHAIN_DIR}/include/)
LINK_DIRECTORIES(${TOOLCHAIN_DIR}/lib)
SET(CMAKE_INSTALL_PREFIX ${TOOLCHAIN_DIR}/libubox)
SET(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/mipsel-openwrt-linux-g++)
SET(CMAKE_C_COMPILER ${TOOLCHAIN_DIR}/bin/mipsel-openwrt-linux-gcc)


PROJECT(ubox C)
ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -Wmissing-declarations)

OPTION(BUILD_LUA "build Lua plugin" OFF)
OPTION(BUILD_EXAMPLES "build examples" OFF)

INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(JSONC json-c)
IF(JSONC_FOUND)
  ADD_DEFINITIONS(-DJSONC)
  INCLUDE_DIRECTORIES(${JSONC_INCLUDE_DIRS})
ENDIF()

SET(SOURCES avl.c avl-cmp.c blob.c blobmsg.c uloop.c usock.c ustream.c ustream-fd.c vlist.c utils.c safe_list.c runqueue.c md5.c kvlist.c ulog.c base64.c)

ADD_LIBRARY(ubox SHARED ${SOURCES})
ADD_LIBRARY(ubox-static STATIC ${SOURCES})
SET_TARGET_PROPERTIES(ubox-static PROPERTIES OUTPUT_NAME ubox)
SET(LIBS)
CHECK_FUNCTION_EXISTS(clock_gettime HAVE_GETTIME)
IF(NOT HAVE_GETTIME)
        CHECK_LIBRARY_EXISTS(rt clock_gettime "" NEED_GETTIME)
        IF(NEED_GETTIME)
                TARGET_LINK_LIBRARIES(ubox rt)
        ENDIF()
ENDIF()

FILE(GLOB headers *.h)
INSTALL(FILES ${headers}
        DESTINATION include/libubox
)
INSTALL(TARGETS ubox ubox-static
        ARCHIVE DESTINATION lib
        LIBRARY DESTINATION lib
)

#ADD_SUBDIRECTORY(lua)
#ADD_SUBDIRECTORY(examples)

find_library(json NAMES json-c)
IF(EXISTS ${json})
        #       ADD_LIBRARY(blobmsg_json SHARED blobmsg_json.c)
        #       TARGET_LINK_LIBRARIES(blobmsg_json ubox ${json})

        ADD_LIBRARY(blobmsg_json-static STATIC blobmsg_json.c)
        SET_TARGET_PROPERTIES(blobmsg_json-static
                              PROPERTIES OUTPUT_NAME blobmsg_json)

                      # ADD_EXECUTABLE(jshn jshn.c)
                      # TARGET_LINK_LIBRARIES(jshn blobmsg_json ${json})
  ADD_LIBRARY(json_script SHARED json_script.c)
        TARGET_LINK_LIBRARIES(json_script ubox)

        #       INSTALL(TARGETS blobmsg_json blobmsg_json-static jshn json_script
        #       ARCHIVE DESTINATION lib
        #       LIBRARY DESTINATION lib
        #       RUNTIME DESTINATION bin
        #)

        FILE(GLOB scripts sh/*.sh)
        INSTALL(FILES ${scripts}
                DESTINATION share/libubox
        )

ENDIF()

说明：TOOLCHAIN_DIR ：为OpenWrt SDK 编译工具的根目录

4、编译

#cmake CMakeLists.txt
#make
#make install

可能遇到的问题：没有按指定的位置去安装，只需将安装好的对应文件复制到OpenWrt SDK 编译工具目录对应位置即可。

网上关于libubox交叉编译的文章太少，而且大多数都会编译失败，so 写了这边文章，亲测可行。

libubox交叉编译到mipsel架构处理器MT7628/n(在Ubuntu系统下,编译出openwrt系统可运行库)

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