NS2：undefined reference to `xxx' collect2: error: ld returned 1 exit status
2018-03-18 20:45
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这个问题是没有链接。
刚开始先确认，头文件有没有导入。
以下是完整的提示信息错误，检查之后发现hdr_ant_pkt所在的头文件已经被导入； In function `hdr_ant_pkt::access(Packet const*)':
cmu-trace.cc:(.text._ZN11hdr_ant_pkt6accessEPK6Packet[_ZN11hdr_ant_pkt6accessEPK6Packet]+0x7): undefined reference to `hdr_ant_pkt::offset_'接下来确认，makefile文件，发现新加去的代码没有在里面添加.o，添加完之后再编译，成功通过。
刚开始先确认，头文件有没有导入。
以下是完整的提示信息错误，检查之后发现hdr_ant_pkt所在的头文件已经被导入； In function `hdr_ant_pkt::access(Packet const*)':
cmu-trace.cc:(.text._ZN11hdr_ant_pkt6accessEPK6Packet[_ZN11hdr_ant_pkt6accessEPK6Packet]+0x7): undefined reference to `hdr_ant_pkt::offset_'接下来确认，makefile文件，发现新加去的代码没有在里面添加.o，添加完之后再编译，成功通过。
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