NDK编译libevent等开源库

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##简单编译libevent

从这里下载修改后的libevent源码，然后在解压后的目录下创建目录jni。将当前目录的Android.mk拷贝到jni目录下。修改Android.mk如下：

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE:= libevent2
LOCAL_MODULE_TAGS:= optional
LOCAL_SRC_FILES := \
	../epoll.c \
	../epoll_sub.c \
	../evdns.c \
	../event.c \
	../event_tagging.c \
	../evmap.c \
	../evrpc.c \
	../evthread.c \
	../evthread_pthread.c \
	../evutil.c \
	../evutil_rand.c \
	../log.c \
	../poll.c \
	../select.c \
	../signal.c \
	../strlcpy.c

LOCAL_C_INCLUDES := \
	$(LOCAL_PATH) \
	$(LOCAL_PATH)/../android \
	$(LOCAL_PATH)/../include 
LOCAL_CFLAGS := -DHAVE_CONFIG_H -DANDROID -fvisibility=hidden
include $(BUILD_STATIC_LIBRARY)

若有编译错误，直接注释以下代码

#ifdef _EVENT_HAVE_SYS_EVENTFD_H
//#include <sys/eventfd.h>
#endif

qjw@qjw-PC /cygdrive/d/android/android-ndk-r9c/samples/hello-jni/jni/libevent
$ $NDK_ROOT/ndk-build
[armeabi] Compile thumb  : event2 <= event.c
[armeabi] Compile thumb  : event2 <= event_tagging.c
[armeabi] Compile thumb  : event2 <= evmap.c
[armeabi] Compile thumb  : event2 <= evrpc.c
[armeabi] Compile thumb  : event2 <= evthread.c
[armeabi] Compile thumb  : event2 <= evthread_pthread.c
[armeabi] Compile thumb  : event2 <= evutil.c
[armeabi] Compile thumb  : event2 <= evutil_rand.c
jni/../evutil_rand.c: In function 'ev_arc4random_buf':
jni/../evutil_rand.c:62:2: warning: 'return' with a value, in function returning void [enabled by default]
[armeabi] Compile thumb  : event2 <= log.c
[armeabi] Compile thumb  : event2 <= poll.c
[armeabi] Compile thumb  : event2 <= select.c
[armeabi] Compile thumb  : event2 <= signal.c
[armeabi] Compile thumb  : event2 <= strlcpy.c
[armeabi] StaticLibrary  : libevent2.a

##使用libevent

修改 /cygdrive/d/android/android-ndk-r9c/samples/hello-jni/jni/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)    ####
LOCAL_MODULE    := event2   ####  
LOCAL_SRC_FILES := $(LOCAL_PATH)/libevent/obj/local/armeabi/libevent2.a   ####
include $(PREBUILT_STATIC_LIBRARY)   ####

include $(CLEAR_VARS)

LOCAL_C_INCLUDES := $(LOCAL_PATH)/libevent/include \ ####
	$(LOCAL_PATH)/libevent/android ####
LOCAL_MODULE    := hello-jni
LOCAL_SRC_FILES := hello-jni.c

LOCAL_STATIC_LIBRARIES := event2   ####

##CPP支持若使用诸如protobuf等c++实现的库，使用时，需要在Application.mk 增加以下内容

APP_STL := gnustl_static

同时可以根据需要在Android.mk增加以下内容

LOCAL_CPPFLAGS += -frtti -std=c++11 -fexceptions

增加代码/cygdrive/d/android/android-ndk-r9c/samples/hello-jni/jni/hello-jni.c

#include <event2/event.h>
#include <signal.h>

void fuck()
{
	struct event_base *base;
	struct event *signal_event;
	base = event_base_new();
	signal_event = evsignal_new(base, SIGINT, NULL, (void *)base);
	event_base_dispatch(base);
	event_free(signal_event);
	event_base_free(base);
}

##通用的办法

运行以下命令生成独立的toolchain

$NDK_ROOT/build/tools/make-standalone-toolchain.sh \
	--platform=android-19 \
	--install-dir=/cygdrive/d/android/toolchain \
	--system=windows-x86_64

cd到libevent官方源码的根目录，运行以下命令

./configure --host=arm \
	CC=/cygdrive/d/android/toolchain/bin/arm-linux-androideabi-gcc.exe \
	CPP=/cygdrive/d/android/toolchain/bin/arm-linux-androideabi-cpp.exe \
	CXX=/cygdrive/d/android/toolchain/bin/arm-linux-androideabi-g++.exe
make

编译结束后，会在.lib目录下生成libevent_core.a和libevent.a等一堆库文件。

##参考

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