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• Android link many static libraries into shared library

  3 février 2014, par nmxprime

  i have 4 static libraries libavcodec.a libavutil.a libswscale.a libx264.a

  I want to link it with libmytest.so

  I tried below Android.mk script

  LOCAL_PATH := $(call my-dir)
  
  INITIAL_PATH := $(LOCAL_PATH)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := mytest
  
  
  
  LOCAL_SRC_FILES := mytest.c
  
  
  
  LOCAL_LDLIBS += -llog
  
  LOCAL_WHOLE_STATIC_LIBRARIES := libavutil libavcodec libswscale libx264
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  mytest.c calls many functions from those libraries. The 4 libraries are placed inside PROJECTPATH\jni\.

  But i get undefined reference to all functions from those libraries.

  I tried giving LOCAL_ALLOW_UNDEFINED_SYMBOLS := truewhich allowed me to create shared library, but when i launch the app, i get

  01-22 07:15:15.650: E/AndroidRuntime(9655): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1285]:  1868 cannot locate 'avcodec_register_all'...
  
  01-22 07:15:15.650: E/AndroidRuntime(9655):     at java.lang.Runtime.loadLibrary(Runtime.java:370)
  
  01-22 07:15:15.650: E/AndroidRuntime(9655):     at java.lang.System.loadLibrary(System.java:535)

• Android link many static libraries into shared library

  3 février 2014, par nmxprime

  i have 4 static libraries libavcodec.a libavutil.a libswscale.a libx264.a

  I want to link it with libmytest.so

  I tried below Android.mk script

  LOCAL_PATH := $(call my-dir)
  
  INITIAL_PATH := $(LOCAL_PATH)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := mytest
  
  
  
  LOCAL_SRC_FILES := mytest.c
  
  
  
  LOCAL_LDLIBS += -llog
  
  LOCAL_WHOLE_STATIC_LIBRARIES := libavutil libavcodec libswscale libx264
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  mytest.c calls many functions from those libraries. The 4 libraries are placed inside PROJECTPATH\jni\.

  But i get undefined reference to all functions from those libraries.

  I tried giving LOCAL_ALLOW_UNDEFINED_SYMBOLS := truewhich allowed me to create shared library, but when i launch the app, i get

  01-22 07:15:15.650: E/AndroidRuntime(9655): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1285]:  1868 cannot locate 'avcodec_register_all'...
  
  01-22 07:15:15.650: E/AndroidRuntime(9655):     at java.lang.Runtime.loadLibrary(Runtime.java:370)
  
  01-22 07:15:15.650: E/AndroidRuntime(9655):     at java.lang.System.loadLibrary(System.java:535)

• Android ndk link failed on libgnustl_shared.so

  15 juin 2016, par nmxprime

  i have compiled ffmpeg with libstagefright

  In the last, while linking i got undefined references using below

  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffsft1.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffsft1.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lstdc++ -lx264 -lmedia -lutils  -lstagefright -lbinder --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/$CPU/libgcc.a

  Refering this i modified as below

  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -soname libffsft1.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffsft1.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lstdc++ -lx264 -lmedia -lutils  -lstagefright -lbinder --warn-once  --dynamic-linker=/system/bin/linker $NDK/sources/cxx-stl/gnu-libstdc++/libs/armeY-›v7a/libgnustl_shared.so $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/$CPU/libgcc.a

  where

  CPU=armv7-a
  
  PREFIX=./android/$CPU
  
  NDK=~/Android/android-ndk-r7c
  
  PLATFORM=$NDK/platforms/android-9/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86

  Now i got the .so file, but when using it in Android, i got

  03-11 03:26:35.760: E/AndroidRuntime(24036):    at dalvik.system.NativeStart.main(Native Method)
  
  03-11 03:26:35.760: E/AndroidRuntime(24036): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: link_image[1892]:  1908 could not load needed library 'libgnustl_shared.so' for 'libffsft1.so' (load_library[1094]: Library 'libgnustl_shared.so' not found)
  
  03-11 03:26:35.760: E/AndroidRuntime(24036):    at java.lang.Runtime.loadLibrary(Runtime.java:370)
  
  03-11 03:26:35.760: E/AndroidRuntime(24036):    at java.lang.System.loadLibrary(System.java:535)

  So should i copy the required library and use a System.loadlibrary to load it ? or do am i doing it in wrong way ?

  ---

  For your reference, i add the undefied references i got while not linking with $NDK/sources/cxx-stl/gnu-libstdc++/libs/armeY-›v7a/libgnustl_shared.so

  libavcodec/libavcodec.a(libstagefright.o):In function `std::_Rb_tree_const_iterator >::operator--()':/home/Android/android-ndk-r7c/sources/cxx-stl/gnu-libstdc++/include/bits/stl_tree.h:274: undefined reference to `std::_Rb_tree_decrement(std::_Rb_tree_node_base const*)'
  
  libavcodec/libavcodec.a(libstagefright.o): In function `std::_Rb_tree<long long="long" timestamp="timestamp">, std::_Select1st >, std::less<long long="long">, std::allocator > >::_M_insert_(std::_Rb_tree_node_base const*, std::_Rb_tree_node_base const*, std::pair<long long="long" timestamp="timestamp"> const&amp;)':/home/Android/android-ndk-r7c/sources/cxx-stl/gnu-libstdc++/include/bits/stl_tree.h:923: undefined reference to `std::_Rb_tree_insert_and_rebalance(bool, std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, std::_Rb_tree_node_base&amp;)'
  
  libavcodec/libavcodec.a(libstagefright.o): In function `std::_Rb_tree_const_iterator >::operator++()':/home/Android/android-ndk-r7c/sources/cxx-stl/gnu-libstdc++/include/bits/stl_tree.h:259: undefined reference to `std::_Rb_tree_increment(std::_Rb_tree_node_base const*)'
  
  libavcodec/libavcodec.a(libstagefright.o): In function `std::_Rb_tree_iterator >::operator++(int)':/home/Android/android-ndk-r7c/sources/cxx-stl/gnu-libstdc++/include/bits/stl_tree.h:192: undefined reference to `std::_Rb_tree_increment(std::_Rb_tree_node_base*)'
  
  libavcodec/libavcodec.a(libstagefright.o): In function `std::_Rb_tree<long long="long" timestamp="timestamp">, std::_Select1st >, std::less<long long="long">, std::allocator > >::erase(std::_Rb_tree_iterator >)':/home/Android/android-ndk-r7c/sources/cxx-stl/gnu-libstdc++/include/bits/stl_tree.h:1387: undefined reference to `std::_Rb_tree_rebalance_for_erase(std::_Rb_tree_node_base*, std::_Rb_tree_node_base&amp;)'
  
  libavcodec/libavcodec.a(libstagefright.o): In function `std::_Rb_tree_iterator >::operator--()':/home/Android/android-ndk-r7c/sources/cxx-stl/gnu-libstdc++/include/bits/stl_tree.h:199: undefined reference to `std::_Rb_tree_decrement(std::_Rb_tree_node_base*)'
  
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