android ndk 编译 libevent
Russinovich`s Blog 2022-10-19 原文
https://www.shuzhiduo.com/A/rV57oAKG5P/

1. 下载 libevent 2.1.8 版本

https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz

2. 先在 win10 上用 wsl ubuntu 编译 libevent

3. 在 wsl 上，准备需要的编译环境

sudo apt-get install automake

sudo apt-get install autoconf

sudo apt-get install libtool

4. 在livevent目录下运行 autogen.sh

./autogen.sh

autoreconf: Entering directory `.’

autoreconf: configure.ac: not using Gettext

autoreconf: running: aclocal --force -I m4

autoreconf: configure.ac: tracing

autoreconf: running: libtoolize --copy --force

libtoolize: putting auxiliary files in ‘.’.

libtoolize: copying file ‘./ltmain.sh’

libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, ‘m4’.

libtoolize: copying file ‘m4/libtool.m4’

libtoolize: copying file ‘m4/ltoptions.m4’

libtoolize: copying file ‘m4/ltsugar.m4’

libtoolize: copying file ‘m4/ltversion.m4’

libtoolize: copying file ‘m4/lt~obsolete.m4’

autoreconf: running: /usr/bin/autoconf --force

autoreconf: running: /usr/bin/autoheader --force

autoreconf: running: automake --add-missing --copy --force-missing

configure.ac:25: installing ‘./compile’

configure.ac:13: installing ‘./missing’

Makefile.am: installing ‘./depcomp’

autoreconf: Leaving directory `.’

5. ./configure

6. make

至此在 wsl ubuntu 上编译libevent已经完成了

下面，就需要在android ndk 环境下编译

1. 在windows上，下载最新版本的ndk

2. 编写 Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_ARM_MODE := arm

LOCAL_MODULE := libevent

LIB_SRC := event.c
evthread.c
buffer.c
bufferevent.c
bufferevent_filter.c
bufferevent_pair.c
listener.c
bufferevent_ratelim.c
evmap.c
log.c
evutil.c
evutil_rand.c
select.c
poll.c
epoll.c
signal.c
event_tagging.c
http.c
evdns.c
evrpc.c
bufferevent_sock.c

LOCAL_SRC_FILES := $(LIB_SRC)

LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
$(LOCAL_PATH)/compat

LOCAL_CFLAGS += -pie -fPIE -static -fPIC

include $(BUILD_STATIC_LIBRARY)

3. 编译 Application.mk

APP_STL := c++_static

APP_CPPFLAGS := -frtti -std=c++11

APP_ABI := armeabi-v7a arm64-v8a x86

#APP_ABI := armeabi-v7a

4. 调用 ndk-build.cmd 就可以编译了

编译过程中遇到的问题, 需要修改 ./include/event2/event-config.h 中的定义

1. error: ‘sys/sysctl.h’ file not found

注释定义 #define EVENT__HAVE_SYS_SYSCTL_H 1

2. error: static declaration of ‘arc4random_addrandom’ follows non-static declaration

增加定义 #define EVENT__HAVE_ARC4RANDOM 1

3. error: use of undeclared identifier ‘fd_mask’

注释定义 #define EVENT__HAVE_FD_MASK 1

4. error: ‘sys/timerfd.h’ file not found

注释定义 #define EVENT__HAVE_SYS_TIMERFD_H 1

5. error: use of undeclared identifier ‘EPOLL_CLOEXEC’

注释定义 #define EVENT__HAVE_EPOLL_CREATE1 1

基本上就对event-config.h中的一些配置做调整就可以在ndk环境当中编译了，非常简单！