windows编译libevent

   这里简单介绍windows编译礼拜libevent，主要环境vs2017，libevent版本2.1.8。

    先下载libevent源码：http://libevent.org/

    解压：libevent-2.1.8-stable

    打开vs2017开发人员命令提示符，进入解压的目录输入：nmake \f Makefile.nmake,  这样可以编译出32位的静态库，把静态库保存，删除所有生成文件，打开vs2017本机X64命令提示工具，进入解压目录，先打开文件Makefile.nmake，找到如下位置：

LIBFLAGS=/nologo

后面加入 /MACHINE:X64，如下：

!IFDEF OPENSSL_DIR
SSL_CFLAGS=/I$(OPENSSL_DIR)\include /DEVENT__HAVE_OPENSSL
!ELSE
SSL_CFLAGS=
!ENDIF

# Needed for correctness
CFLAGS=/IWIN32-Code /IWIN32-Code/nmake /Iinclude /Icompat /DHAVE_CONFIG_H /I. $(SSL_CFLAGS)

# For optimization and warnings
CFLAGS=$(CFLAGS) /Ox /W3 /wd4996 /nologo

# XXXX have a debug mode

LIBFLAGS=/nologo /MACHINE:X64

CORE_OBJS=event.obj buffer.obj bufferevent.obj bufferevent_sock.obj \
	bufferevent_pair.obj listener.obj evmap.obj log.obj evutil.obj \
	strlcpy.obj signal.obj bufferevent_filter.obj evthread.obj \
	bufferevent_ratelim.obj evutil_rand.obj evutil_time.obj
WIN_OBJS=win32select.obj evthread_win32.obj buffer_iocp.obj \
	event_iocp.obj bufferevent_async.obj
EXTRA_OBJS=event_tagging.obj http.obj evdns.obj evrpc.obj