c – 未定义引用`_GetAdaptersAddresses @ 20′ – 但我包括-liphlpapi

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 ……