用于android ndk开发的google :: protobuf

Question

我最近尝试将Caffe模型(c ++)的某些预测函数移动到Android平台(ndk级别)这是链接: 这个模型需要OpenCV/OpenCV2和google :: protobuf的支持.我已经在Android.mk中包含了OpenCV的所有必需的lib(.a)来编译成.so lib,如下面的java所示(在Android.mk中):

include $(CLEAR_VARS)
LOCAL_MODULE := opencv_features2d
LOCAL_SRC_FILES := libopencv_features2d.a
LOCAL_EXPORT_C_INCLUDES := /home/wm/Downloads/OpenCV-android-sdk/sdk/native/jni/include
include $(PREBUILT_STATIC_LIBRARY)

然后我编译谷歌:: protobuf的-2.5.0在ubuntu14.04的Android的NDK-r11c拿到三个静态库(libprotobuf.a,libprotobuf-lite.a,libprotoc.a),这里的所有脚本build_library .sh:

#!/bin/bash
export NDK=/home/wm/Downloads/android-ndk-r11c
export SYSROOT=$NDK/platforms/android-15/arch-arm/

export TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/

export PATH=$PATH:$TOOLCHAIN/bin

#export CC="arm-linux-androideabi-gcc --sysroot $SYSROOT"
export CXX="arm-linux-androideabi-g++ --sysroot $SYSROOT"
export CXXSTL=$NDK/sources/cxx-stl/gnu-libstdc++/4.9

function build_one
{
mkdir build

./configure --prefix=$(pwd)/build \
--host=arm-linux-androideabi \
--with-sysroot=$SYSROOT \
--enable-static \
--disable-shared \
--enable-cross-compile \
--with-protoc=protoc LIBS="-lc-lstdc++" \
# CFLAGS="-march=armv7-a" \
CXXFLAGS="-march=armv7-a -I$CXXSTL/include -I$CXXSTL/libs/armeabi-v7a/include -L$CXXSTL/libs/armeabi-v7a/ -lgnustl_static"

make clean
make
make install
}

CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"
build_one

# Inspect the library architecture specific information
# arm-linux-androideabi-readelf -A build/lib/libprotobuf-lite.a

以及用于支持Opencv2/dnn模块的三个库(也在Android.mk中):

include $(CLEAR_VARS)
LOCAL_MODULE := google_protobuf
LOCAL_SRC_FILES := libprotobuf.a
LOCAL_EXPORT_C_INCLUDES := $(call my-dir)/sources/protobuf-2.5.0/build/include
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := google_protobuflite
LOCAL_SRC_FILES := libprotobuf-lite.a
LOCAL_EXPORT_C_INCLUDES := $(call my-dir)/sources/protobuf-2.5.0/build/include
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := google_protoc
LOCAL_SRC_FILES := libprotoc.a
LOCAL_EXPORT_C_INCLUDES := $(call my-dir)/sources/protobuf-2.5.0/build/include
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := opencv_dnn
LOCAL_SRC_FILES := libopencv_dnn.a
LOCAL_STATIC_LIBRARIES := google_protobuf google_protoc google_protobuflite
LOCAL_EXPORT_C_INCLUDES := /home/wm/Downloads/OpenCV-android-sdk/sdk/native/jni/include
include $(PREBUILT_STATIC_LIBRARY)

但问题来自于我建立android.mk以获取MyLib.so:

LOCAL_MODULE := MyLib
LOCAL_C_INCLUDES :=/home/wm/Downloads/OpenCV-android-sdk/sdk/native/jni/include/opencv
LOCAL_C_INCLUDES +=/home/wm/Downloads/OpenCV-android-sdk/sdk/native/jni/include
LOCAL_SRC_FILES := com_example_alexandroskarargyris_myapplication_NativeClass.cpp
LOCAL_STATIC_LIBRARIES := opencv_dnn opencv_xphoto opencv_xobjdetect opencv_ximgproc opencv_xfeatures2d opencv_videostab opencv_videoio opencv_video opencv_ts opencv_line_descriptor
LOCAL_STATIC_LIBRARIES += opencv_tracking opencv_text opencv_surface_matching opencv_superres  opencv_structured_light opencv_aruco opencv_bgsegm opencv_bioinspired opencv_imgproc
LOCAL_STATIC_LIBRARIES += opencv_calib3d opencv_ccalib opencv_core opencv_datasets opencv_dpm opencv_face opencv_features2d opencv_flann opencv_hal opencv_highgui opencv_imgcodecs opencv_ml
LOCAL_STATIC_LIBRARIES += opencv_objdetect opencv_optflow opencv_photo opencv_reg opencv_rgbd opencv_saliency opencv_shape opencv_stereo opencv_stitching
LOCAL_STATIC_LIBRARIES += libjpeg libwebp libpng libtiff libjasper IlmImf tbb
LOCAL_LDLIBS += -llog -lz -ldl -lm **-lstdc++**

include $(BUILD_SHARED_LIBRARY)

问题似乎缺少stl-library的某些部分,但是在build_library.sh中:CXXFLAGS =" - march = armv7-a -I $ CXXSTL/include -I $ CXXSTL/libs/armeabi-v7a/include -L $ CXXSTL/libs/armeabi-v7a/-lgnustl_static"

我已经包含gnu_stl static并且在android.mk的同一目录中,Application.mk也声明了gnustl:

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-15

我真的希望有人可以就这种情况给我一些建议.

Answer 1

可能你知道,但有一个特定的android-caffe端口,有例子:

library:https: //github.com/sh1r0/caffe-android-lib

在caffe/android文件夹中有JNI包装器和caffe_mobile文件

例:

https://github.com/sh1r0/caffe-android-demo

它使用android-21本机API级别,它不支持某些io库,如(leveldb,lmdb和hdf5,只有cpu).

该库有许多脚本可以下载每个3rparty依赖项(protobuf,gflags,eigem,openblas).Eigen3默认定义,但它只能用于arm处理器的openblas_library.

我有类似的问题,但在我的情况下,当我尝试使用cmake交叉编译工具链接我自己的.so包装库时,我的stl库问题出现了.gnustl_static不起作用,它在boost库链接上失败.

directory_iterator_increment(boost::filesystem::directory_iterator&, boost::system::error_code*): error: undefined reference to 'stpcpy'

无论如何,我希望这些参考资料可以帮助您解决问题.

干杯