[GitHub] [incubator-mxnet] bykim555 commented on issue #14844: ci/build.py failed to build MXNet for Android_armv7

[GitBox <gi...@apache.org>]

bykim555 commented on issue #14844:
URL: https://github.com/apache/incubator-mxnet/issues/14844#issuecomment-749504290


   1. Tried to build Android_armv7 using ci/build.py and sucess. ndk17, api 24
   2.  Use Android Studio. 
   Android.mk, 
   include $(CLEAR_VARS)
   LOCAL_MODULE := mxnet_inference          
   LOCAL_SRC_FILES := $(LOCAL_PATH)/libs/libmxnet.so
   LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include/mxnet        
   include $(PREBUILT_SHARED_LIBRARY) 
   ...
   LOCAL_SHARED_LIBRARIES += mxnet_inference
   include $(BUILD_SHARED_LIBRARY)           
   
   Application.mk
   APP_ABI := armeabi-v7a
   APP_PLATFORM := android-24
   APP_STL := c++_static
   NDK_TOOLCHAIN_VERSION := clang
   APP_BUILD_SCRIPT := Android.mk
   
   build.gradle
   android {
       compileSdkVersion 29
       buildToolsVersion "29.0.2"
       defaultConfig {
           applicationId "com.tistory.webnautes.useopencvwithndk_build"
           minSdkVersion 21
           targetSdkVersion 25
           versionCode 1
           versionName "1.0"
           testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
   
          // ndk {
          //     abiFilters "armeabi-v7a"
          // }
       }
   
       buildTypes {
           release {
               minifyEnabled false
               proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
           }
       }
       externalNativeBuild {
           ndkBuild {
               path 'src/main/jni/Android.mk'
           }
      }
   
       packagingOptions {
          // pickFirst 'lib/arm64-v8a/*'
           pickFirst 'lib/armeabi-v7a/*'
          // pickFirst 'lib/x86/*'
          // pickFirst 'lib/x86_64/*'
       }
   }
   
   error showed as follows:
   #==================
   E/AndroidRuntime: FATAL EXCEPTION: main
       Process: com.tistory.webnautes.useopencvwithndk_build, PID: 12657
       java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "__aeabi_memcpy4" referenced by "/data/app/com.tistory.webnautes.useopencvwithndk_build-2/lib/arm/libmxnet.so"...
           at java.lang.Runtime.loadLibrary(Runtime.java:372)
           at java.lang.System.loadLibrary(System.java:1076)
           at com.tistory.webnautes.useopencvwithndk_build.MainActivity.<clinit>(MainActivity.java:48)
           at java.lang.Class.newInstance(Native Method)
           at android.app.Instrumentation.newActivity(Instrumentation.java:1095)
           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3083)
           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
           at android.app.ActivityThread.access$1100(ActivityThread.java:221)
           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
           at android.os.Handler.dispatchMessage(Handler.java:102)
           at android.os.Looper.loop(Looper.java:158)
           at android.app.ActivityThread.main(ActivityThread.java:7224)
           at java.lang.reflect.Method.invoke(Native Method)
           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
   I/Process: Sending signal. PID: 12657 SIG: 9
   #=======================================
   How to fix that? Thank you.


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