easycwmp的交叉编译
平台： Linux version 2.6.32-279.el6.x86_64 交叉编译器路径：/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux- 开发板：FL2440 开发板运行内核：linux3.0 开发板文件系统：initramfs
easycwmp依赖的许多软件的Makefile都是用cmake语法生成的，故简单介绍一下要经常用到的几个cmake语法：
1.LINK_DIRECTORIES：动态链接库或静态链接库的搜索路径，相当于gcc的-L参数
2.INCLUDE_DIRECTORIES:指定头文件搜索路径，相当于-I参数
3.TARGET_LINK_LIBRARIES(uci ubox)添加链接库,相同于指定-l参数。
如：target_link_libraries(demo Hello) #将可执行文件与Hello连接成最终文件demo
4.find_library(THREAD_DB_LIBRARY NAMES thread_db PATHS /usr/lib/ /usr/local/lib/)
在目录"/usr/lib"和"/usr/local/lib"下查找libthread_db.so，如果找到则把库文件的绝对路径赋给THREAD_DB_LIBRARY
一、准备工作
1.创建fl-easycwmp目录用以存放安装文件
2.创建install目录
二、交叉编译json-c
1.获取json-c源文件
git clone git://github.com/json-c/json-c.git ./json-c
2.创建build.sh
vim build.sh #!/bin/bash PRJ_PATH=`pwd` #CROSS=/opt/buildroot-2011.11/arm920t/usr/bin/arm-linux- CROSS=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux- make clean #autoreconf -i export CC=${CROSS}gcc export CPP=${CROSS}cpp export AS=${CROSS}as export LD=${CROSS}ld export AR=${CROSS}ar export RANLIB=${CROSS}ranlib export STRIP=${CROSS}strip export ac_cv_func_malloc_0_nonnull=yes export ac_cv_func_realloc_0_nonnull=yes export ac_cv_have_decl_isinf=yes export ac_cv_have_decl_isnan=yes #export LDFLAGS += -lm ./configure --enable-rdrand --disable-dependency-tracking --with-PACKAGE --with-gnu-ld --with-pic --bu ild=i686-pc-linux-gnu --host=arm-linux --prefix=${PRJ_PATH}/../install
顺便说一下makefile里cflags的-Wall -o2 -g
-Wall 是打开警告开关，-O代表默认优化，可选：-O0不优化，-O1低级优化，-O2中级优化，-O3高级优化，-Os代码空间优化。
-g是生成调试信息，生成的可执行文件具有和源代码关联的可调试的信息；-pg是生成函数调用关系，函数执行时间等信息，将这些信息保存在gmon.out中，可用gprof命令进行查看
3.执行 build.sh 安装json-c
然后在生成的Makefile里把修改LDFLAGS = -lm，注意每次修改后要make clean（make clean仅仅是清除之前编译的可执行文件及配置文件。 而make distclean要清除所有生成的文件。）
make
make install
三、安装libubox
1、获取libubox
[weishusheng@localhost fl-easycwmp]$ git clone git://nbd.name/luci2/libubox.git ./libubox
2.在工程主CMakeLists.txt 中首先加入如下语句：(##注意Linux第一个字母为大写，否则cmake不认识)
[weishusheng@localhost libubox]$ vim CMakeLists.txt SET(CMAKE_SYSTEM_NAME Linux) #告诉编译器你要交叉编译，Linux是你要编译过去的平台 SET(TOOLCHAIN_DIR "/opt/buildroot-2012.08/arm920t/usr") #告诉编译器交叉编译器路径 SET(CMAKE_FIND_ROOT_PATH ${TOOLCHAIN_DIR}) #告诉cmake查找的根目录是什么 SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH) #告诉cmake怎么查找编译时的工具程序的位置 SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY "/home/weishusheng/fl-easycwmp/install/lib/") #告诉cmake怎么查找编译时的库文件的位置 SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) #告诉cmake怎么查找编译时的头文件的位置 SET(CMAKE_C_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-gcc) SET(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-g++) SET(CMAKE_INSTALL_PREFIX "/home/weishusheng/fl-easycwmp/install/")
注意：
ONLY表示只在CMAKE_FIND_ROOT_PATH下找
BOTH表示可以在CMAKE_FIND_ROOT_PATH下找，也可以在系统目录下找
NEVER表示不查找
3.生成Makefile
[weishusheng@localhost libubox]$ cmake CMakeLists.txt -DBUILD_LUA=OFF
4.make
错误解决：
错误1
/home/weishusheng/fl-easycwmp/libubox/blobmsg_json.c: In function '__blobmsg_add_json': /home/weishusheng/fl-easycwmp/libubox/blobmsg_json.c:78:2: error: implicit declaration of function 'is_error'
分析：is_error没有定义，在pc上编译时也遇到这个问题，我们知道他的定义为#define is_error(ptr) (ptr == NULL)，于是添加定义
[weishusheng@localhost libubox]$ vim /home/weishusheng/fl-easycwmp/libubox/blobmsg_json.c #include "blobmsg.h" #include "blobmsg_json.h" #define is_error(ptr) (ptr == NULL)
错误2
cannot find -ljson-c
在CMakeLists.txt里指定json-c库路径
[weishusheng@localhost libubox]$ vim CMakeLists.txt
LINK_DIRECTORIES(/home/weishusheng/fl-easycwmp/install/lib/)
错误3
/home/weishusheng/fl-easycwmp/libubox/jshn.c: In function 'jshn_parse': /home/weishusheng/fl-easycwmp/libubox/jshn.c:162:2: error: implicit declaration of function 'is_error'
添加定义
#define is_error(ptr) (ptr == NULL)
4.错误4
/home/weishusheng/cross_easycwmp/install/lib/libjson-c.so: undefined reference to `__isnan' /home/weishusheng/cross_easycwmp/install/lib/libjson-c.so: undefined reference to `__isinf'
如果有遇到类似问题的，可以尝试在编译json-c时加上
export ac_cv_have_decl_isinf=yes
export ac_cv_have_decl_isnan=yes
并连接上数学库即LDFLAGS+=-lm
四、安装uci
1.获取uci
[weishusheng@localhost fl-easycwmp]$ git clone git://nbd.name/uci.git ./uci
2.修改CMakeList.txt
[weishusheng@localhost uci]$ vim CMakeLists.txt SET(CMAKE_SYSTEM_NAME Linux) SET(TOOLCHAIN_DIR "/opt/buildroot-2012.08/arm920t/usr") SET(CMAKE_FIND_ROOT_PATH ${TOOLCHAIN_DIR}) SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH) SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) SET(CMAKE_C_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-gcc) SET(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-g++) SET(CMAKE_INSTALL_PREFIX "/home/weishusheng/fl-easycwmp/install/") cmake_minimum_required(VERSION 2.6)
3.生成makefile
[weishusheng@localhost uci]$ cmake CMakeLists.txt -DBUILD_LUA=OFF
4.make
/opt/buildroot-2012.08/arm920t/usr/lib/gcc/arm-unknown-linux-uclibcgnueabi/4.5.4/../../../../arm-unknown-linux-uclibcgnueabi/bin/ld: cannot find -lubox
在CMakeList.txt里加入
LINK_DIRECTORIES(/home/weishusheng/fl-easycwmp/install/lib/)
问题解决
5.make install
五、安装ubus
1.获取ubus
git clone git://nbd.name/luci2/ubus.git ./ubus
2.修改CMakeList.txt
[weishusheng@localhost ubus]$ vim CMakeLists.txt SET(CMAKE_SYSTEM_NAME Linux) SET(TOOLCHAIN_DIR "/opt/buildroot-2012.08/arm920t/usr") SET(CMAKE_FIND_ROOT_PATH ${TOOLCHAIN_DIR}) SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH) SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) SET(CMAKE_C_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-gcc) SET(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-g++) SET(CMAKE_INSTALL_PREFIX "/home/weishusheng/fl-easycwmp/install/")
3.生成makefile
[weishusheng@localhost ubus]$ cmake CMakeLists.txt -DBUILD_LUA=OFF CMake Error: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files: json linked by target "cli" in directory /home/weishusheng/fl-easycwmp/ubus
解决办法：在CMakeList.txt里指定json库路径
修改SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY）为 SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY "/home/weishusheng/fl-easycwmp/install/lib")
可解决。
4.make
错误：cannot find -lubox
解决办法：在CMakeLists里加上
LINK_DIRECTORIES(/home/weishusheng/fl-easycwmp/install/lib)
错误：json/json.h: No such file or directory
解决办法：交叉编译时默认标准头文件是交叉编译器路径下的，可以用echo 'main(){}'|/opt/buildroot-
2012.08/arm920t/usr/bin/arm-linux-gcc -E -v - 命令进行查看，我们把需要用到的头文件加到上诉命令找到的位置就可以
了，另外，交叉编译会到系统默认标准库目录下找库文件，这会导致格式不符合，需要用-L及-l指定库文件
[weishusheng@localhost json-c]$ pwd /home/weishusheng/fl-easycwmp/install/include/json-c [weishusheng@localhost json-c]$ sudo mkdir /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux- uclibcgnueabi/sysroot/usr/include/json [weishusheng@localhost json-c]$ sudo cp * /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux- uclibcgnueabi/sysroot/usr/include/json [weishusheng@localhost json-c]$
六、安装microxml
1.获取源文件
[weishusheng@localhost fl-easycwmp]$ git clone git://dev.freecwmp.org/microxml ./microxml
2、建立build.sh文件
[weishusheng@localhost microxml]$ vim build.sh #!/bin/bash PRJ_PATH=`pwd` #CROSS=/opt/buildroot-2011.11/arm920t/usr/bin/arm-linux- CROSS=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux- make distclean autoreconf -i export CC=${CROSS}gcc export CPP=${CROSS}cpp export AS=${CROSS}as export LD=${CROSS}ld export AR=${CROSS}ar export RANLIB=${CROSS}ranlib export STRIP=${CROSS}strip ./configure --host=arm-linux --prefix=${PRJ_PATH}/../install make && make install
3.执行 build.sh
七、最后编译easycwmp
1.获取源文件
[weishusheng@localhost fl-easycwmp]$ wget http://easycwmp.org/download/easycwmp-1.0.5.tar.gz
2.解压，把easycwmp-1.0.5更名为easycwmp并进入该目录
[weishusheng@localhost fl-easycwmp]$ cp ../cross_easycwmp/easycwmp-1.0.5.tar.gz . [weishusheng@localhost fl-easycwmp]$ mv easycwmp-1.0.5 easycwmp [weishusheng@localhost fl-easycwmp]$ cd easycwmp
3.生成makefile
[weishusheng@localhost easycwmp]$ autoreconf -i
3.生成makefile
[weishusheng@localhost easycwmp]$CC=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc AR=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ar LD=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ld AS=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-as RANLIB=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ranlib CPP=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-cpp ./configure --host=arm-linux --prefix=/home/weishusheng/myfl2440/cwmp/fl-easycwmp/install MICROXML_CFLAGS="-I/home/weishusheng/myfl2440/cwmp/fl-easycwmp/install/include -D_THREAD_SAFE -D_REENTRANT" MICROXML_LIBS="-L/home/weishusheng/myfl2440/cwmp/fl-easycwmp/install/lib -lmicroxml -lpthread" --enable-debug --enable-devel --enable-acs=multi --enable-jsonc=1 --with-uci-include-path=/home/weishusheng/myfl2440/cwmp/fl-easycwmp/uci/
4.
[weishusheng@localhost easycwmp]$ make
错误：curl/curl.h: No such file or directory 解决办法：a、先交叉编译curl（下载地址http://curl.haxx.se/download.html）， b、[weishusheng@localhost include]$ sudo mkdir /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux- uclibcgnueabi/sysroot/usr/include/curl c、[weishusheng@localhost fl-easycwmp]$ tar -xzf curl-7.41.0.tar.gz d、vim build.sh #!/bin/bash PRJ_PATH=`pwd` #CROSS=/opt/buildroot-2011.11/arm920t/usr/bin/arm-linux- CROSS=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux- make distclean autoreconf -i export CC=${CROSS}gcc export CPP=${CROSS}cpp export AS=${CROSS}as export LD=${CROSS}ld export AR=${CROSS}ar export RANLIB=${CROSS}ranlib export STRIP=${CROSS}strip ./configure --host=arm-linux --prefix=${PRJ_PATH}/../install make && make install e.把头文件复制到相应位置 [weishusheng@localhost curl]$ pwd /home/weishusheng/fl-easycwmp/install/include/curl [weishusheng@localhost curl]$ ls curlbuild.h curlrules.h easy.h multi.h typecheck-gcc.h curl.h curlver.h mprintf.h stdcheaders.h [weishusheng@localhost curl]$ sudo cp * /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux-uclibcgnueabi/sysroot/usr/include/curl
错误：src/ubus.c:14:21: fatal error: libubus.h: No such file or directory 解决办法： [weishusheng@localhost ubus]$ pwd /home/weishusheng/fl-easycwmp/ubus [weishusheng@localhost ubus]$ sudo cp libubus.h /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux- uclibcgnueabi/sysroot/usr/include/
错误：ubusmsg.h: No such file or directory 解决办法： [weishusheng@localhost ubus]$ pwd /home/weishusheng/cross_easycwmp/ubus [weishusheng@localhost ubus]$ sudo cp ubusmsg.h /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux- uclibcgnueabi/sysroot/usr/include/
错误：ubus_common.h: No such file or directory 解决办法： [weishusheng@localhost ubus]$ sudo cp ubus_common.h /opt/buildroot-2012.08/arm920t/usr/arm-unknown-linux- uclibcgnueabi/sysroot/usr/include/
错误：src/json.c:42: undefined reference to `is_error' 解决办法： vim src/json.c #define is_error(ptr) (ptr == NULL)
[weishusheng@localhost easycwmp]$ make
[weishusheng@localhost easycwmp]$ make install
至此easycwmp的交叉编译完成，接下来放到FL2440开发板上跑，在开发板上还要做相关设置，请参考下一遍博文。
