写宏遇到的问题：warning: backslash and newline separated by space - C

转自：http://blog.youkuaiyun.com/liyongming1982/article/details/6663031

   原来是因为\ 后面多了一个空格

   附上一个刚刚写得调试用的例子：

#define desay_debug(_string,myValue) \
    do{\
		 c_snprintf(desay_info, \
		          250 - 1, \
		          "\ndesay: File: %s  Line#: %d  Func: %s()\n !!!:message is %s value is %d\n", \
			      __FILE__, \
			      __LINE__, \
			      __func__, \
			      _string, \
			      myValue); \
		desayEvent.ui4_msg_id=DESAY_MESSAGE_ID;\
        desayEvent.ui4_data1=(UINT32)&desay_info[0];\
        a_am_get_app_handle_from_name(&h_app_desay,"homepage");\
        c_app_send_msg(h_app_desay,0,&desayEvent,sizeof(DESAY_MSG_T),NULL,NULL);\
    }while(0)

来自IBM网页的解释。。
Solution: The backslash (\) character is used as the continuation character to continue #define statements and strings to the next line. GCC expects the backslash character to be the very last character on the line. This warning indicates that there is a space after the backslash. Delete the space and any other characters that come after the backslash.