windows編譯libevent時報告“缺少print_winsock_errors.obj”的解決

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一、綜述

Libevent 是一個用C語言編寫的、輕量級的開源高效能事件通知庫。

在libevent官網(http://libevent.org)下載源碼包，在Windows平台編譯時間，會報缺少“print_winsock_errors.obj”的錯誤。

 

二、原因及解決

經檢查，這是因為源碼包中缺少檔案test/print_winsock_errors.c導致，原因未知。

解決方案：手工產生test/print_winsock_errors.c，以下為從git搜尋到的代碼內容：

#include <winsock2.h>#include <windows.h>#include <stdlib.h>#include <stdio.h>#include "event2/event.h"#include "event2/util.h"#include "event2/thread.h"#define E(x) printf (#x " -> \"%s\"\n", evutil_socket_error_to_string (x));int main (int argc, char **argv){  int i, j;  const char *s1, *s2;#ifdef EVTHREAD_USE_WINDOWS_THREADS_IMPLEMENTED  evthread_use_windows_threads ();#endif  s1 = evutil_socket_error_to_string (WSAEINTR);  for (i = 0; i < 3; i++) {    printf ("\niteration %d:\n\n", i);    E(WSAEINTR);    E(WSAEACCES);    E(WSAEFAULT);    E(WSAEINVAL);    E(WSAEMFILE);    E(WSAEWOULDBLOCK);    E(WSAEINPROGRESS);    E(WSAEALREADY);    E(WSAENOTSOCK);    E(WSAEDESTADDRREQ);    E(WSAEMSGSIZE);    E(WSAEPROTOTYPE);    E(WSAENOPROTOOPT);    E(WSAEPROTONOSUPPORT);    E(WSAESOCKTNOSUPPORT);    E(WSAEOPNOTSUPP);    E(WSAEPFNOSUPPORT);    E(WSAEAFNOSUPPORT);    E(WSAEADDRINUSE);    E(WSAEADDRNOTAVAIL);    E(WSAENETDOWN);    E(WSAENETUNREACH);    E(WSAENETRESET);    E(WSAECONNABORTED);    E(WSAECONNRESET);    E(WSAENOBUFS);    E(WSAEISCONN);    E(WSAENOTCONN);    E(WSAESHUTDOWN);    E(WSAETIMEDOUT);    E(WSAECONNREFUSED);    E(WSAEHOSTDOWN);    E(WSAEHOSTUNREACH);    E(WSAEPROCLIM);    E(WSASYSNOTREADY);    E(WSAVERNOTSUPPORTED);    E(WSANOTINITIALISED);    E(WSAEDISCON);    E(WSATYPE_NOT_FOUND);    E(WSAHOST_NOT_FOUND);    E(WSATRY_AGAIN);    E(WSANO_RECOVERY);    E(WSANO_DATA);    E(0xdeadbeef); /* test the case where no message is available */    /* fill up the hash table a bit to make sure it grows properly */    for (j = 0; j < 50; j++) {      int err;      evutil_secure_rng_get_bytes(&err, sizeof(err));      evutil_socket_error_to_string(err);    }  }  s2 = evutil_socket_error_to_string (WSAEINTR);  if (s1 != s2)    printf ("caching failed!\n");  libevent_global_shutdown ();  return EXIT_SUCCESS;}

然後使用VS命令提示工具，在libevent解壓目錄下執行：nmake /f Makefile.nmake，編譯順利通過。

 

三、其它

經檢查，在官網列出的1.4.x-stable, 2.0.x-stable, 2.1.x-stable等版本中貌似均存在此問題。

print_winsock_errors.c只有一段測試代碼，沒有也關係不大，因此另一種解決方案是：修改CmakeFileList，從中刪除與print_winsock_errors有關的內容。

windows編譯libevent時報告“缺少print_winsock_errors.obj”的解決