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asked 2019-01-15 12:40:34 -0600

epatton gravatar image

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to a version built with opencl that I created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I've attached the Android.mk, but below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to a version opencv3 built with opencl that I created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I've attached the Android.mk, but below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to opencv3 built with opencl created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I've attached the Android.mk, I'd attach the Android.mk but below this forum only allows image attachments. Below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to opencv3 built with opencl created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I'd attach the Android.mk but this forum only allows image attachments. Below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

This is the entire Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS) PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3

LOCAL_EXPORT_C_INCLUDE_DIRS := \ $(PREBUILT_INCLUDE_PATH) \ $(PREBUILT_INCLUDE_PATH)/modules/core/include \ $(PREBUILT_INCLUDE_PATH)/opencv2 \ $(PREBUILT_INCLUDE_PATH)/modules/hal/include

LOCAL_MODULE := libopencv_core_prebuilt LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libNV LOCAL_MODULE_TAGS := optional LOCAL_VENDOR_MODULE := true

LOCAL_C_INCLUDES := \ external/opencv3/include/opencv \ external/opencv3/include \ external/opencv3/modules/core/include \ external/opencv3/modules/hal/include \ external/opencv3/modules/imgproc/include \ external/opencv3/modules/photo/include \ external/opencv3/modules/video/include \ external/opencv3/modules/objdetect/include \ external/opencv3/modules/features2d/include \ external/opencv3/modules/flann/include \ external/opencv3/modules/calib3d/include \ external/opencv3/modules/imgcodecs/include \ external/opencv3/modules/videoio/include \ external/opencv3/modules/highgui/include \ external/opencv3/modules/ml/include \ external/opencv3/modules/shape/include \ external/opencv3/modules/stitching/include \ external/opencv3/modules/superres/include \ external/opencv3/modules/videostab/include \ external/jsoncpp/include \ device/my_app/apps/external/OpenCL \ $(LOCAL_PATH)/include \ system/core/include

LOCAL_EXPORT_C_INCLUDE_DIRS := \ $(LOCAL_PATH)/include

LOCAL_SRC_FILES := \ src/NVOpencv.cpp \ src/NVProcAngles.cpp \ src/NVUtils.cpp \ src/ILogger.cpp

LOCAL_CPPFLAGS := \ -std=c++14 \ -fPIC \ -fsigned-char \ -frtti \ -fexceptions \ -Wno-non-virtual-dtor \ -Wno-unused-parameter \ -Wno-write-strings

LOCAL_STATIC_LIBRARIES := \ libopencv_hal \ libopencv_core_prebuilt

LOCAL_SHARED_LIBRARIES := \ libc++ \ libopencv_imgproc \ #libopencv_core \ libdl \ liblog \ libion \ libOpenCL

LOCAL_TIDY = true

include $(BUILD_STATIC_LIBRARY)

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to opencv3 built with opencl created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I'd attach the Android.mk but this forum only allows image attachments. Below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

This is the entire Android.mk

LOCAL_PATH := $(call my-dir)
 
my-dir)
include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
 
/hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
$(PREBUILT_INCLUDE_PATH) \
$(PREBUILT_INCLUDE_PATH)/modules/core/include \
$(PREBUILT_INCLUDE_PATH)/opencv2 \
$(PREBUILT_INCLUDE_PATH)/modules/hal/include
 
$(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
 
$(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)
 
$(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
 
$(CLEAR_VARS)
LOCAL_MODULE := libNV
LOCAL_MODULE_TAGS := optional
LOCAL_VENDOR_MODULE := true
 
true
LOCAL_C_INCLUDES := \
external/opencv3/include/opencv \
external/opencv3/include \
external/opencv3/modules/core/include \
external/opencv3/modules/hal/include \
external/opencv3/modules/imgproc/include \
external/opencv3/modules/photo/include \
external/opencv3/modules/video/include \
external/opencv3/modules/objdetect/include \
external/opencv3/modules/features2d/include \
external/opencv3/modules/flann/include \
external/opencv3/modules/calib3d/include \
external/opencv3/modules/imgcodecs/include \
external/opencv3/modules/videoio/include \
external/opencv3/modules/highgui/include \
external/opencv3/modules/ml/include \
external/opencv3/modules/shape/include \
external/opencv3/modules/stitching/include \
external/opencv3/modules/superres/include \
external/opencv3/modules/videostab/include \
external/jsoncpp/include \
device/my_app/apps/external/OpenCL \
$(LOCAL_PATH)/include \
system/core/include
 
system/core/include
LOCAL_EXPORT_C_INCLUDE_DIRS := \
$(LOCAL_PATH)/include
 
$(LOCAL_PATH)/include
LOCAL_SRC_FILES := \
src/NVOpencv.cpp \
src/NVProcAngles.cpp \
src/NVUtils.cpp \
src/ILogger.cpp
 
src/ILogger.cpp
LOCAL_CPPFLAGS := \
-std=c++14 \
-fPIC \
-fsigned-char \
-frtti \
-fexceptions \
-Wno-non-virtual-dtor \
-Wno-unused-parameter \
-Wno-write-strings
 
-Wno-write-strings
LOCAL_STATIC_LIBRARIES := \
libopencv_hal \
libopencv_core_prebuilt
 
libopencv_core_prebuilt
LOCAL_SHARED_LIBRARIES := \
libc++ \
libopencv_imgproc \
#libopencv_core \
libdl \
liblog \
libion \
libOpenCL
 
libOpenCL
LOCAL_TIDY = true
 
true
include $(BUILD_STATIC_LIBRARY)
$(BUILD_STATIC_LIBRARY)

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to opencv3 built with opencl created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I'd attach the Android.mk but this forum only allows image attachments. Below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to the Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

This is the entire Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3

LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include

LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE        := libNV
LOCAL_MODULE_TAGS   := optional
LOCAL_VENDOR_MODULE := true

LOCAL_C_INCLUDES := \
        external/opencv3/include/opencv \
        external/opencv3/include \
        external/opencv3/modules/core/include \
        external/opencv3/modules/hal/include \
        external/opencv3/modules/imgproc/include \
        external/opencv3/modules/photo/include \
        external/opencv3/modules/video/include \
        external/opencv3/modules/objdetect/include \
        external/opencv3/modules/features2d/include \
        external/opencv3/modules/flann/include \
        external/opencv3/modules/calib3d/include \
        external/opencv3/modules/imgcodecs/include \
        external/opencv3/modules/videoio/include \
        external/opencv3/modules/highgui/include \
        external/opencv3/modules/ml/include \
        external/opencv3/modules/shape/include \
        external/opencv3/modules/stitching/include \
        external/opencv3/modules/superres/include \
        external/opencv3/modules/videostab/include \
        external/jsoncpp/include \
        device/my_app/apps/external/OpenCL \
        $(LOCAL_PATH)/include \
        system/core/include

LOCAL_EXPORT_C_INCLUDE_DIRS := \
            $(LOCAL_PATH)/include

LOCAL_SRC_FILES := \
                src/NVOpencv.cpp \
                src/NVProcAngles.cpp \
                src/NVUtils.cpp \
                src/ILogger.cpp

LOCAL_CPPFLAGS := \
        -std=c++14 \
        -fPIC \
        -fsigned-char \
        -frtti \
        -fexceptions \
        -Wno-non-virtual-dtor \
        -Wno-unused-parameter \
        -Wno-write-strings

LOCAL_STATIC_LIBRARIES := \
        libopencv_hal \
        libopencv_core_prebuilt

LOCAL_SHARED_LIBRARIES := \
        libc++ \
        libopencv_imgproc \
        #libopencv_core \
        libdl \
        liblog \
        libion \
        libOpenCL

LOCAL_TIDY = true

include $(BUILD_STATIC_LIBRARY)

Linking prebuilt opencv static library in Android.mk

Hi I am trying to link prebuilt external/opencv3 libopencv_core.a in the Android tree to my project that's also in the tree. I get the following error

ninja: error: 'out/target/product/neo/obj/STATIC_LIBRARIES/libopencv_core_prebuilt_intermediates/export_includes', needed by 'out/target/product/neo/obj/STATIC_LIBRARIES/libNV_intermediates/import_includes', missing and no known rule to make it

I am able to link to libopencv_core when Android builds it, but I need to link to opencv3 built with opencl created using the following make.

cd /hdd/NEO8/external/opencv3/platforms
./scripts/cmake_android_arm.sh -DANDROID_ABI=arm64-v8a -DANDROID_NATIVE_API_LEVEL=android-23 -DWITH_OPENCL=yes -DWITH_CUDA=no
cd build_android_arm
make -j8
OpenCV static libraries are created in the lib/arm64-v8a directory.

My project is all native code (c++) with no jni or Java.

The tree structure is:

hdd/NEO8/
my_android_tree_root/
                external/opencv3  (this is where I build the libopencv_core.a)
                device/my_app  (this is where my Android.mk is)

The external/opencv3 code is v3.0 downloaded from Google.

I'd attach the Android.mk but this forum only allows image attachments. Below is how I'm adding the prebuilt to the Android.mk

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3
LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include
LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a
include $(PREBUILT_STATIC_LIBRARY)

The LOCAL_EXPORT_C_INCLUDE_DIRS is the same as what I use when I link to the Android built opencv3.

I can tell that the Android build process is finding the libopencv_core.a file because when I change the static library name to something bogus, i.e.

LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core_bogusName.a

the linker says it can't find libopencv_core_bogusName.a.

Is there a way to get more information out of the Android build info like a verbose=true setting? Any ideas on what I can try would be greatly appreciated.

This is the entire Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
PREBUILT_PATH := /hdd/NEO8/external/opencv3/platforms/build_android_arm/lib/arm64-v8a
PREBUILT_INCLUDE_PATH := /hdd/NEO8/external/opencv3

LOCAL_EXPORT_C_INCLUDE_DIRS := \
    $(PREBUILT_INCLUDE_PATH) \
    $(PREBUILT_INCLUDE_PATH)/modules/core/include \
    $(PREBUILT_INCLUDE_PATH)/opencv2 \
    $(PREBUILT_INCLUDE_PATH)/modules/hal/include

LOCAL_MODULE            := libopencv_core_prebuilt
LOCAL_SRC_FILES := $(PREBUILT_PATH)/libopencv_core.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE        := libNV
LOCAL_MODULE_TAGS   := optional
LOCAL_VENDOR_MODULE := true

LOCAL_C_INCLUDES := \
        external/opencv3/include/opencv \
        external/opencv3/include \
        external/opencv3/modules/core/include \
        external/opencv3/modules/hal/include \
        external/opencv3/modules/imgproc/include \
        external/opencv3/modules/photo/include \
        external/opencv3/modules/video/include \
        external/opencv3/modules/objdetect/include \
        external/opencv3/modules/features2d/include \
        external/opencv3/modules/flann/include \
        external/opencv3/modules/calib3d/include \
        external/opencv3/modules/imgcodecs/include \
        external/opencv3/modules/videoio/include \
        external/opencv3/modules/highgui/include \
        external/opencv3/modules/ml/include \
        external/opencv3/modules/shape/include \
        external/opencv3/modules/stitching/include \
        external/opencv3/modules/superres/include \
        external/opencv3/modules/videostab/include \
        external/jsoncpp/include \
        device/my_app/apps/external/OpenCL \
        $(LOCAL_PATH)/include \
        system/core/include

LOCAL_EXPORT_C_INCLUDE_DIRS := \
            $(LOCAL_PATH)/include

LOCAL_SRC_FILES := \
                src/NVOpencv.cpp \
                src/NVProcAngles.cpp \
                src/NVUtils.cpp \
                src/ILogger.cpp

LOCAL_CPPFLAGS := \
        -std=c++14 \
        -fPIC \
        -fsigned-char \
        -frtti \
        -fexceptions \
        -Wno-non-virtual-dtor \
        -Wno-unused-parameter \
        -Wno-write-strings

LOCAL_STATIC_LIBRARIES := \
        libopencv_hal \
        libopencv_core_prebuilt

LOCAL_SHARED_LIBRARIES := \
        libc++ \
        libopencv_imgproc \
        #libopencv_core \
        libdl \
        liblog \
        libion \
        libOpenCL

LOCAL_TIDY = true

include $(BUILD_STATIC_LIBRARY)
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