OS X 上交叉编译在 Android 上运行的 libevent



下载官方源码 这里使用的是 libevent-2.0.21
首先看了下这几篇文章
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export ANDROID_ROOT=$ANDROID_NDK
 
export PATH=$PATH:$ANDROID_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin
 
 ./configure \
 --host=arm-linux-androideabi \
 CC=arm-linux-androideabi-gcc \
 LD=arm-linux-androideabi-ld \
 CPPFLAGS="-I$ANDROID_ROOT/platforms/android-14/arch-arm/usr/include/" \
 CFLAGS="-nostdlib" \
 LDFLAGS="-Wl,-rpath-link=$ANDROID_ROOT/platforms/android-14/arch-arm/usr/lib/ -L$ANDROID_ROOT/platforms/android-14/arch-arm/usr/lib/" \
 LIBS="-lc -lgcc -L$ANDROID_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9"
 
ln -s $ANDROID_ROOT/platforms/android-14/arch-arm/usr/lib/crtbegin_so.o
ln -s $ANDROID_ROOT/platforms/android-14/arch-arm/usr/lib/crtend_so.o
 
make
还有另外一种方法，看起来比较正规点
以下是编译armv7-a的方法(其它arch需要稍微调整下)
注意，以下 $ANDROID_NDK 都是本机上 NDK 的路径
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export NDK=$ANDROID_NDK
$NDK/build/tools/make-standalone-toolchain.sh --platform=android-14 --toolchain=arm-linux-androideabi-4.9 --install-dir=`pwd`/android-toolchain-arm
export TOOLCHAIN_PATH=`pwd`/android-toolchain-arm/bin
export TOOL=arm-linux-androideabi
export NDK_TOOLCHAIN_BASENAME=${TOOLCHAIN_PATH}/${TOOL}
export CC=$NDK_TOOLCHAIN_BASENAME-gcc
export CXX=$NDK_TOOLCHAIN_BASENAME-g++
export LINK=${CXX}
export LD=$NDK_TOOLCHAIN_BASENAME-ld
export AR=$NDK_TOOLCHAIN_BASENAME-ar
export RANLIB=$NDK_TOOLCHAIN_BASENAME-ranlib
export STRIP=$NDK_TOOLCHAIN_BASENAME-strip
export ARCH_FLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16"
export ARCH_LINK="-march=armv7-a -Wl,--fix-cortex-a8"
export CPPFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 "
export CXXFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 -frtti -fexceptions "
export CFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 "
export LDFLAGS=" ${ARCH_LINK} "
 
./configure --host=arm-linux-androideabi
就会在 .libs 下生成 so/a 档案
例子程序程序调用过程当中遇到的问题，具体完整代码参见 https://github.com/guohai/and-libevent
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guohai@Hais-MacBook-Pro:~/Dev/work/idea/and-libevent/app/src/main/jni$ ndk-build V=1 -B
rm -f /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/arm64-v8a/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi-v7a/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi-v7a-hard/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/mips/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/mips64/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/x86/lib*.so /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/x86_64/lib*.so
rm -f /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/arm64-v8a/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi-v7a/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi-v7a-hard/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/mips/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/mips64/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/x86/gdbserver /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/x86_64/gdbserver
rm -f /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/arm64-v8a/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi-v7a/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/armeabi-v7a-hard/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/mips/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/mips64/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/x86/gdb.setup /Users/guohai/Dev/work/idea/and-libevent/app/src/main/libs/x86_64/gdb.setup
[armeabi-v7a] Compile thumb  : demo_libevent <= demo_libevent.c
/Users/guohai/Dev/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc -MMD -MP -MF /Users/guohai/Dev/work/idea/and-libevent/app/src/main/obj/local/armeabi-v7a/objs/demo_libevent/demo_libevent.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -no-canonical-prefixes -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp -mthumb -Os -g -DNDEBUG -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -I/Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni -DANDROID  -Wa,--noexecstack -Wformat -Werror=format-security    -I/Users/guohai/Dev/android-ndk-r10c/platforms/android-3/arch-arm/usr/include -c  /Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni/demo_libevent.c -o /Users/guohai/Dev/work/idea/and-libevent/app/src/main/obj/local/armeabi-v7a/objs/demo_libevent/demo_libevent.o
[armeabi-v7a] Executable     : demo_libevent
/Users/guohai/Dev/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++ -Wl,--gc-sections -Wl,-z,nocopyreloc --sysroot=/Users/guohai/Dev/android-ndk-r10c/platforms/android-3/arch-arm -Wl,-rpath-link=/Users/guohai/Dev/android-ndk-r10c/platforms/android-3/arch-arm/usr/lib -Wl,-rpath-link=/Users/guohai/Dev/work/idea/and-libevent/app/src/main/obj/local/armeabi-v7a /Users/guohai/Dev/work/idea/and-libevent/app/src/main/obj/local/armeabi-v7a/objs/demo_libevent/demo_libevent.o /Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni/libevent.a /Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni/libevent_core.a /Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni/libevent_extra.a /Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni/libevent_pthreads.a -lgcc -no-canonical-prefixes -march=armv7-a -Wl,--fix-cortex-a8  -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now  -L/Users/guohai/Dev/android-ndk-r10c/platforms/android-3/arch-arm/usr/lib -llog -lc -lm -o /Users/guohai/Dev/work/idea/and-libevent/app/src/main/obj/local/armeabi-v7a/demo_libevent
/Users/guohai/Dev/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/guohai/Dev/work/idea/and-libevent/app/src/main/jni/libevent.a(event.o): in function evthread_make_base_notifiable:event.c(.text.evthread_make_base_notifiable+0x5c): error: undefined reference to 'eventfd'
collect2: ld returned 1 exit status
make: *** [/Users/guohai/Dev/work/idea/and-libevent/app/src/main/obj/local/armeabi-v7a/demo_libevent] Error 1
eventfd 是 2.6.22 加入到内核当中的系统调用，然后默认写的 -L/Users/guohai/Dev/android-ndk-r10c/platforms/android-3/arch-arm/usr/lib 内核比较低，于是修改
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APP_PLATFORM := android-14
编译通过
在模拟器上启动程序，配置端口转发，测试
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guohai@Hais-MacBook-Pro:~$ adb forward tcp:9995 tcp:9995
 
guohai@Hais-MacBook-Pro:~$ telnet localhost 9995
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Hello, World!
Connection closed by foreign host.
服务器端的反馈
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root@generic:/data/data # ./demo_libevent                                       
flushed answer
^CCaught an interrupt signal; exiting cleanly in two seconds.
done
root@generic:/data/data # exit

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