操作系统kylin
下载sendip-2.5.tar.gz
解压在/home/sendip-2.5/目录下
执行make命令
出现错误：
cc1: warnings being treated as errors
ipv4.c: In function 'do_opt':
ipv4.c:212: warning: pointer targets inpassing argument 1 of 'sprintf' differ in signedness
ipv4.c:213: warning: pointer targets inpassing argument 1 of 'compact_string' differ in signedness
ipv4.c:240: warning: pointer targets inpassing argument 5 of 'addoption' differ in signedness
ipv4.c:355: warning: pointer targets inpassing argument 5 of 'addoption' differ in signedness
ipv4.c:380: warning: pointer targets inpassing argument 5 of 'addoption' differ in signedness
ipv4.c:402: warning: pointer targets inpassing argument 5 of 'addoption' differ in signedness
make: *** [ipv4.so] Error 1
提示上述warning被作为错误
我们打开ipv4.c文件，找到各行，如212行：sprintf(data,"0x%s",arg);
发 现参数data在前面（207行）声明为u_int8_t *类型，而sprintf的参数一般为（char *）而得到data的变量arg也是char *类型的，于是我们在212行将参数data显示转换为char *类型：sprintf((char *)data,"0x%s",arg);
再次make发现212行warning消失，于是其213几行和同样处理。
在 240、355、380、402行方法'addoption'的data的参数是char *类型，但我们发现386行的addoption方法第5个参数为u_int8_t *类型，于是我们将上面几行的data显示转换为u_int8_t *类型，如240行：addoption(0,0,7,len+2,(u_int8_t *)data,pack);
再次make发现ipv4.c中的warning已经消失，但是出现tcp.c文件中的若干warning：
cc1: warnings being treated as errors
tcp.c: In function 'do_opt':
tcp.c:207: warning: pointer targets inpassing argument 1 of 'sprintf' differ in signedness
tcp.c:208: warning: pointer targets inpassing argument 1 of 'compact_string' differ in signedness
tcp.c:239: warning: pointer targets inassignment differ in signedness
tcp.c:241: warning: pointer targets inpassing argument 1 of 'strchr' differ in signedness
tcp.c:241: warning: pointer targets inassignment differ in signedness
tcp.c:249: warning: pointer targets inassignment differ in signedness
tcp.c:252: warning: pointer targets inassignment differ in signedness
tcp.c:262: warning: pointer targets inassignment differ in signedness
tcp.c:264: warning: pointer targets inassignment differ in signedness
tcp.c:266: warning: pointer targets in assignmentdiffer in signedness
tcp.c:270: warning: pointer targets inassignment differ in signedness
make: *** [tcp.so] Error 1
(CentOS6.5 下报错：)
cc1: warnings being treated as errors
ipv4.c: 在函数‘do_opt’中:
ipv4.c:212: 错误：传递‘sprintf’的参数 1 给指针时，目标与指针符号不一致
/usr/include/stdio.h:363: 附注：需要类型‘char * __restrict__’，但实参的类型为‘u_int8_t *’
ipv4.c:213: 错误：传递‘compact_string’的参数 1 给指针时，目标与指针符号不一致
sendip_module.h:41: 附注：需要类型‘char *’，但实参的类型为‘u_int8_t *’
ipv4.c:240: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
ipv4.c:355: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
ipv4.c:380: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
ipv4.c:402: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
make: *** [ipv4.so] 错误 1
gcc -o ipv4.so -fPIC -fsigned-char -pipe -Wall -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -Wnested-externs -Winline -Werror -g -Wcast-align -DSENDIP_LIBS=\"/usr/local/lib/sendip\" -shared ipv4.c csum.o compact.o
cc1: warnings being treated as errors
ipv4.c: 在函数‘do_opt’中:
ipv4.c:212: 错误：传递‘sprintf’的参数 1 给指针时，目标与指针符号不一致
/usr/include/stdio.h:363: 附注：需要类型‘char * __restrict__’，但实参的类型为‘u_int8_t *’
ipv4.c:213: 错误：传递‘compact_string’的参数 1 给指针时，目标与指针符号不一致
sendip_module.h:41: 附注：需要类型‘char *’，但实参的类型为‘u_int8_t *’
ipv4.c:240: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
ipv4.c:355: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
ipv4.c:380: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
ipv4.c:402: 错误：传递‘addoption’的参数 5 给指针时，目标与指针符号不一致
ipv4.c:81: 附注：需要类型‘u_int8_t *’，但实参的类型为‘char *’
make: *** [ipv4.so] 错误 1
我们以类似的方法找到各行，进行格式修改：
207行：sprintf((char*)data,"0x%s",arg);
208行：len =compact_string((char *)data);
239行：next=(unsigned char*)arg;
241行：next=(unsigned char*)strchr((char *)next,',');
249行：next=(unsigned char*)arg;
252行：next=(unsigned char*)strchr(arg, ':');
262行：arg=(char *)next;
264行：next=(unsigned char*)strchr(arg, ',');
266行：next=(unsigned char*)arg-1; /* Finito - next points to \0 */
270行：arg=(char *)next;
重新make通过
make install通过
安装完成