MinGW + Boost：未定义引用`WSAStartup @ 8' [英] MinGW + Boost: undefined reference to `WSAStartup@8'

问题描述

以下是我执行的

D：\Just4Fun\software\> make -f Makefile.hands stest

g ++。exe -g -D_WIN32_WINNT = 0x0601 -ID：\Boost\boost_1_51_0 -LD：\Boost\boost_1_51_0\stage\lib -LD：\MinGW\lib -lboost_system- mgw46-d-1_51 -lboost_filesystem-mgw46-d-1_51 -lboost_iostreams-mgw46-d-1_51 -lws2_32 -lwsock32 -o TestSerial.exe TestSerial.cpp

是

C：\Users\oleg\AppData\Local\Temp\\ \\ ccXpC7RG.o：在函数'ZN5boost4asio6detail17winsock_init_base7startupERNS2_4dataEhh'：
D：/Boost/boost_1_51_0/boost/asio/detail/impl/winsock_init.ipp：39：未定义引用'WSAStartup @ 8'C：\Users\\ \\oleg\AppData\Local\Temp\ccXpC7RG.o：在函数ZN5boost4asio6detail17winsock_init_base7cleanupERNS2_4dataE中：
D：/Boost/boost_1_51_0/boost/asio/detail/impl/winsock_init.ipp：48：undefined reference到'WSACleanup @ 0'
collect2：ld返回1退出状态
make：*** [stest]错误1

下面是检查库中有关提到的symobls的结果（我未能以适当的方式格式化）

`d：\MinGW\lib> nm - C libws2_32.a | grep WSAStartup

00000000 T WSAStartup @ 8

00000000 I imp _WSAStartup @ 8

d ：\MinGW\lib> nm -C libws2_32.a | grep WSACleanup

00000000 T WSACleanup @ 0

00000000 I imp _WSACleanup @ 0

d ：\MinGW\lib> nm -C libwsock32.a | grep WSACleanup

00000000 T WSACleanup @ 0

00000000 I imp _WSACleanup @ 0

d ：\MinGW\lib> nm -C libwsock32.a | grep WSAStartup

00000000 T WSAStartup @ 8

00000000 I imp _WSAStartup @ 8`

因为我们看到符号存在于库中，库在相应的-L命令行选项引用的地方。

所以，为什么未定义的引用????

解决方案

这是一个非常常见的错误，有一个非常简单的解决方案：放置在之后链接的库源文件和目标文件。 / p>

below is what I execute

D:\Just4Fun\software\>make -f Makefile.hands stest
g++.exe -g -D_WIN32_WINNT=0x0601 -ID:\Boost\boost_1_51_0 -LD:\Boost\boost_1_51_0\stage\lib -LD:\MinGW\lib -lboost_system-mgw46-d-1_51 -lboost_filesystem-mgw46-d-1_51 -lboost_iostreams-mgw46-d-1_51 -lws2_32 -lwsock32 -o TestSerial.exe TestSerial.cpp

below is the result of that

C:\Users\oleg\AppData\Local\Temp\ccXpC7RG.o: In function 'ZN5boost4asio6detail17winsock_init_base7startupERNS2_4dataEhh': D:/Boost/boost_1_51_0/boost/asio/detail/impl/winsock_init.ipp:39: undefined reference to 'WSAStartup@8'C:\Users\oleg\AppData\Local\Temp\ccXpC7RG.o: In function 'ZN5boost4asio6detail17winsock_init_base7cleanupERNS2_4dataE': D:/Boost/boost_1_51_0/boost/asio/detail/impl/winsock_init.ipp:48: undefined reference to 'WSACleanup@0' collect2: ld returned 1 exit status make: *** [stest] Error 1

Below is result of checking libraries regarding to mentioned symobls (I failed to format it in appropriate way)

`d:\MinGW\lib>nm -C libws2_32.a | grep WSAStartup
00000000 T WSAStartup@8
00000000 I imp_WSAStartup@8

d:\MinGW\lib>nm -C libws2_32.a | grep WSACleanup
00000000 T WSACleanup@0
00000000 I imp_WSACleanup@0

d:\MinGW\lib>nm -C libwsock32.a | grep WSACleanup
00000000 T WSACleanup@0
00000000 I imp_WSACleanup@0

d:\MinGW\lib>nm -C libwsock32.a | grep WSAStartup
00000000 T WSAStartup@8
00000000 I imp_WSAStartup@8`

As wee see symbols are existing in the libraries and libraries are on the place referred by the corresponding -L command line options.
So, why "undefined refernce"????

解决方案

It's very common error, with a very simple solution: Place the libraries you link with after the source and object files.

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