windows编译libevent时报告“缺少print_winsock

windows编译libevent时报告“缺少print_winsock_errors.obj”的解决

一、综述

Libevent 是一个用C语言编写的、轻量级的开源高性能事件通知库。

在libevent官网(http://libevent.org)下载源码包，在Windows平台编译时，会报缺少“print_winsock_errors.obj”的错误。

二、原因及解决

经检查，这是因为源码包中缺少文件test/print_winsock_errors.c导致，原因未知。

解决方法：手工生成test/print_winsock_errors.c，以下为从git搜索到的代码内容：

#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_IMPLEMENTEDevthread_use_windows_threads ();
#endifs1 = 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;
}