我在cygwin下使用
gcc编写一些代码,在我的代码中调用来自iphlpapi.h的GetAdaptersAddresses我已经将_WIN32_WINNT设置为高于所需的0x0501,并且在链接器行上我添加了-liphlpapi但是链接器仍然失败了以下内容信息：
gcc -liphlpapi build/obj/*.o -Wall -Wextra -o build/bin/asdf.exe src/asdf.cpp /tmp/ccdjLPVY.o:asdf.cpp:(.text+0x153): undefined reference to `_GetAdaptersAddresses@20' collect2: ld returned 1 exit status
来自asdf.cpp的一些片段：
#if _WIN32_WINNT < 0x0501 #warning _WIN32_WINNT was set lower than 0x0501,fixing #undef _WIN32_WINNT #define _WIN32_WINNT 0x0501 #endif #include <winsock2.h> #include <iphlpapi.h>
我知道他们在那里蠢蠢欲动：
strings /usr/i686-pc-mingw32/sys-root/mingw/lib/libiphlpapi.a | sort | uniq | grep GetAdapters __imp__GetAdaptersAddresses@20 __imp__GetAdaptersInfo@8 _GetAdaptersAddresses@20 _GetAdaptersInfo@8 GetAdaptersAddresses GetAdaptersInfo $strings /usr/lib/w32api/libiphlpapi.a | sort | uniq | grep GetAdapters __imp__GetAdaptersAddresses@20 __imp__GetAdaptersInfo@8 _GetAdaptersAddresses@20 _GetAdaptersInfo@8 GetAdaptersAddresses GetAdaptersInfo
谁有人看到我错过了什么？
编辑：答案
# Change the order,put the linker options last: # Before: gcc -liphlpapi build/obj/*.o -Wall -Wextra -o build/bin/asdf.exe src/asdf.cpp # After: gcc build/obj/*.o -Wall -Wextra -o build/bin/asdf.exe src/asdf.cpp -liphlpapi
解决方法
正如
this question中所解释的那样,gcc参数的顺序很重要.您需要将库包含移到依赖它的对象之后.
所以gcc build / obj / *.o -liphlpapi ……
