Question

我在gcc下使用cygwin在我的代码中编写了一些从GetAdaptersAddresses调用iphlpapi.h的代码，我将_WIN32_WINNT设置为高于所需的代码0x0501并且在链接器行上我添加了-liphlpapi但链接器仍然失败并显示以下消息：

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

asdf.cpp的一些摘录：

#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

有人看到我错过了吗？

编辑：回答

# 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

Answer 1

如this question中所述，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 ...

Answer 2

尝试添加#pragma comment（lib，“Iphlpapi.lib”）

未定义引用`_GetAdaptersAddresses @ 20' - 但我包括-liphlpapi

编辑：回答

2 个答案: