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Android Studio JNI build Error with cmake

I want to build the JNI with android studio so that I can use .so file.
I used the Cmake for it but when I build the JNI, I got the built error.
My build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.ss.raynor.nativehttprequest"
minSdkVersion 18
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags "-std=c++14"
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/cpp/CMakeLists.txt"
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
Build command failed.
Error while executing process
E:\environment\sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {-HE:\Work\NativeHttpRequest\NativeHttpRequest\app\src\main\cpp -BE:\Work\NativeHttpRequest\NativeHttpRequest\app\.externalNativeBuild\cmake\debug\armeabi-v7a -DANDROID_ABI=armeabi-v7a -DANDROID_PLATFORM=android-18 -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=E:\Work\NativeHttpRequest\NativeHttpRequest\app\build\intermediates\cmake\debug\obj\armeabi-v7a -DCMAKE_BUILD_TYPE=Debug -DANDROID_NDK=E:\environment\sdk\ndk-bundle -DCMAKE_CXX_FLAGS=-std=c++14 -DCMAKE_TOOLCHAIN_FILE=E:\environment\sdk\ndk-bundle\build\cmake\android.toolchain.cmake -DCMAKE_MAKE_PROGRAM=E:\environment\sdk\cmake\3.6.4111459\bin\ninja.exe -GAndroid Gradle - Ninja}
-- Check for working C compiler: E:/environment/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
-- Check for working C compiler: E:/environment/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe -- broken
-- Configuring incomplete, errors occurred!
See also "E:/Work/NativeHttpRequest/NativeHttpRequest/app/.externalNativeBuild/cmake/debug/armeabi-v7a/CMakeFiles/CMakeOutput.log".
See also "E:/Work/NativeHttpRequest/NativeHttpRequest/app/.externalNativeBuild/cmake/debug/armeabi-v7a/CMakeFiles/CMakeError.log".
CMake Error at E:/environment/sdk/cmake/3.6.4111459/share/cmake-3.6/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler
"E:/environment/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: E:/Work/NativeHttpRequest/NativeHttpRequest/app/.externalNativeBuild/cmake/debug/armeabi-v7a/CMakeFiles/CMakeTmp
Run Build Command:"E:\environment\sdk\cmake\3.6.4111459\bin\ninja.exe"
"cmTC_2ada3"
[1/2] Building C object CMakeFiles/cmTC_2ada3.dir/testCCompiler.c.o
FAILED:
E:\environment\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang.exe
--target=armv7-none-linux-androideabi18
--gcc-toolchain=E:/environment/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64
--sysroot=E:/environment/sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot
-g -DANDROID -fdata-sections -ffunction-sections -funwind-tables
-fstack-protector-strong -no-canonical-prefixes -fno-addrsig -march=armv7-a
-mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fPIE -o
CMakeFiles/cmTC_2ada3.dir/testCCompiler.c.o -c
E:\Work\NativeHttpRequest\NativeHttpRequest\app\.externalNativeBuild\cmake\debug\armeabi-v7a\CMakeFiles\CMakeTmp\testCCompiler.c
clang.exe: error: unknown argument: '-fno-addrsig'
ninja: build stopped: subcommand failed.

I think your error is related in NDK version.
I checked your build.gradle and there is no issue.
Please download the android-ndk-r16b and set the new NDK Location.
File / Project Structure / SDK Location
I hope it will work for you.

I have experienced in Buiding the JNI. You should try the following actions
Create the new project as Native C++.
Insert your code and try again.
This solved my issue

How to resolve Android ndk build command faild?

I am developing simple ndk sample example using android ndk in android studio. While running my app studio shows below errors.
Build command failed.
Error while executing process D:\Sdk\cmake\3.6.4111459\bin\cmake.exe with
arguments {--build D:\Android Studio\Workspace\NDKSample\app\.externalNativeBuild\cmake\debug\arm64-v8a --target native-lib}
[1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.oFAILED: D:\Sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=aarch64-none-linux-android --gcc-toolchain=D:/Sdk/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=D:/Sdk/ndk-bundle/sysroot -Dnative_lib_EXPORTS -isystem D:/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include -isystem D:/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/include -isystem D:/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/backward -isystem D:/Sdk/ndk-bundle/sysroot/usr/include/aarch64-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -frtti -fexceptions -O0 -fno-limit-debug-info -fPIC -MD -MT CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -MF CMakeFiles\native-lib.dir\src\main\cpp\native-lib.cpp.o.d -o CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -c "D:\Android Studio\Workspace\NDKSample\app\src\main\cpp\native-lib.cpp"
error: error reading 'D:\Android Studio\Workspace\NDKSample\app\src\main\cpp\native-lib.cpp'
1 error generated.ninja: build stopped: subcommand failed.
I have search lot but not able to find proper answer that why I am asking here. I have also unintsall all the components and re-install on my studio still error is there.
Another thing If I change file extension to .C from .CPP whole project gets complied and even runs properly. I don't know why Its not working for .CPP file.
Components I am using.
Android Stuido - 3.1.3
gradle - 3.1.0
cmake - 3.6.4111459
Android ndk - 17.1.4828580
lldb -3.1
native-lib.cpp
#include <jni.h>#include <string>extern "C" JNIEXPORT jstringJNICALLJava_com_mastek_ndksample_MainActivity_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());}
build.gradle
apply plugin: 'com.android.application'android { compileSdkVersion 27
defaultConfig {
applicationId "com.example.ndksample"
minSdkVersion 15
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags "-frtti -fexceptions"
}
}
}
sourceSets {
main {
jniLibs.srcDirs = ['src/main/jniLibs']
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}}dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'}
Anyone know please help me to solve this problem. Thanks in advance.

NDK build fails miserably when the path to project files contains spaces. To fix your build, copy the project to path without spaces.

After lot of trials and help from github google guy I am able to solve. To resolve problem I have follow below steps.
1.go to project directory.
2.deleted .gradle ,app/.externalNativeBuild and app/build.
3.changed local.properties ndk path to external ndk-r16b.
4.Run through Android studio.
5.Finally apk is generate.

Undefined reference when calling a OpenCL function in Android

I am trying to set a simple project in Android Studio with OpenCL. So I created a new project with NDK support and an empty activity. I have copied the libOpenCL.so from my mobile phone to the folder app\src\main\jniLibs\arm8 and I have downloaded the OpenCL headers from the Khronos webpage and copied them to app\src\main\jni\CL. Furthermore, I have done two modifications to the build.gradle file, I have added a parameter to the cppFlags to include the OpenCL folder and I have set an abi filter to build only for arm8. I copy my build.gradle file here:
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
applicationId "es.um.mompes.testopencl"
minSdkVersion 22
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags "-std=c++11 -fexceptions -I${projectDir}/src/main/jni"
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
productFlavors {
arm8 {
ndk {
abiFilter "arm64-v8a"
}
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
I have also added a three lines to the generated native-lib.cpp file to test if OpenCL is working. This is my native-lib.cpp:
#include <jni.h>
#include <string>
#include <CL/cl.h>
extern "C"
JNIEXPORT jstring JNICALL
Java_es_um_mompes_testopencl_MainActivity_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello from C++";
cl_int err;
// Find the number of OpenCL platforms
cl_uint num_platforms;
err = clGetPlatformIDs(0, NULL, &num_platforms);
return env->NewStringUTF(hello.c_str());
}
However, I must be missing something because I am getting an undefined reference error regarding the OpenCL function when I build the project. This is the complete error:
Execution failed for task ':app:externalNativeBuildArm8Debug'.
Build command failed.
Error while executing process C:\Users\Juan\AppData\Local\Android\Sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {--build C:\Users\Juan\AndroidStudioProjects\TestOpenCL\app.externalNativeBuild\cmake\arm8Debug\arm64-v8a --target native-lib}
[1/1] Linking CXX shared library ........\build\intermediates\cmake\arm8\debug\obj\arm64-v8a\libnative-lib.so
FAILED: cmd.exe /C "cd . && C:\Users\Juan\AppData\Local\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=aarch64-none-linux-android --gcc-toolchain=C:/Users/Juan/AppData/Local/Android/sdk/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=C:/Users/Juan/AppData/Local/Android/sdk/ndk-bundle/sysroot -fPIC -isystem C:/Users/Juan/AppData/Local/Android/sdk/ndk-bundle/sysroot/usr/include/aarch64-linux-android -D__ANDROID_API__=22 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -fexceptions -IC:\Users\Juan\AndroidStudioProjects\TestOpenCL\app/src/main/jni -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a --sysroot C:/Users/Juan/AppData/Local/Android/sdk/ndk-bundle/platforms/android-22/arch-arm64 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ........\build\intermediates\cmake\arm8\debug\obj\arm64-v8a\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -llog -lm "C:/Users/Juan/AppData/Local/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/libgnustl_static.a" && cd ."
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o: In function Java_es_um_mompes_testopencl_MainActivity_stringFromJNI':
C:\Users\Juan\AndroidStudioProjects\TestOpenCL\app\src\main\cpp/native-lib.cpp:14: undefined reference toclGetPlatformIDs'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
Do you know what am I missing? I've searching for a few hours over the last two days about how to setup OpenCL in Android Studio but everything I find seems to be outdated and doesn't seem to work for my problem.

Look for Android.mk under jni folder. Then add this:
LOCAL_PATH := $(call my-dir) // should already be there
.
.
LOCAL_LDLIBS := $(LOCAL_PATH)/libOpenCL.so
This example takes the libOpenCL.so from the jni root but you can change this for your needs.
Reference: Getting Started with OpenCL on Android

I would recommend you replace the automatic Android Studio NDK building with your own so you have total control.
Then you can use #RonTLV answer to add the library to the Android.mk and have a proper build.
Android Studio by default ignores Android.mk and generates its own with all the .c/.cpp files in the jni folder.
sourceSets {
debug.jniLibs.srcDir 'src/main/obj/local' //debug builds have symbols
release.jniLibs.srcDir 'src/main/libs' //release builds have cleaned libraries
main.jni.srcDirs = [] //disable automatic ndk-build call with auto-generated Android.mk
}
// call regular ndk-build script manually
task ndkBuild(type: Exec) {
if (System.properties['os.name'].toLowerCase(Locale.ROOT).contains('windows')) {
commandLine 'ndk-build.cmd', '-j8', '-C', file('src/main').absolutePath
} else {
commandLine 'ndk-build', '-j8', '-C', file('src/main').absolutePath
}
}
//Make the NDK task depend on Java build Task
tasks.withType(JavaCompile) {
compileTask -> compileTask.dependsOn ndkBuild
}

Error:org.gradle.internal.UncheckedException: Build command failed

I am trying to extend this project, but it has been built using ANT and these days we are using Android Studio and Gradle in practice. I want to move it on Android Studio for further implementations. So here's my project structure...
app/build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "26.0.0"
defaultConfig {
applicationId "tum.andrive"
minSdkVersion 14
targetSdkVersion 25
versionCode 1
versionName "1.0"
ndk {
abiFilters "armeabi", "armeabi-v7a"
}
sourceSets {
main {
jniLibs.srcDirs = ['src/main/cpp']
}
}
externalNativeBuild {
cmake {
cppFlags "-frtti -fexceptions"
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:25.3.1'
compile project(':opencv')
}
CMakeLists.txt
cmake_minimum_required(VERSION 3.4.1)
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/native-lib.cpp )
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
SET(OpenCV_DIR $ENV{OPENCVSDK}/native/jni)
message(STATUS "opencv found: ${OpenCV_LIBS}")
include_directories( ${OpenCV_DIR}/include/)
target_link_libraries( # Specifies the target library.
native-lib
# Links the target library to the log library
# included in the NDK.
${log-lib} )
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
#OpenCv
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
include $(OPENCVSDK)/native/jni/OpenCV.mk
LOCAL_MODULE := AndriveNative
LOCAL_SRC_FILES := native-lib.cpp
LOCAL_LDLIBS += -llog -ldl
include $(BUILD_SHARED_LIBRARY)
But getting error while building project, have a look on this...
Message View
Gradle Console
D:\Android\workspace\Local\Andrive\app\.externalNativeBuild\cmake\debug\armeabi
--target
native-lib
jvmArgs :
Starting process 'command 'Z:\Android\sdk\cmake\3.6.4111459\bin\cmake.exe''. Working directory: D:\Android\workspace\Local\Andrive\app Command: Z:\Android\sdk\cmake\3.6.4111459\bin\cmake.exe --build D:\Android\workspace\Local\Andrive\app\.externalNativeBuild\cmake\debug\armeabi --target native-lib
Successfully started process 'command 'Z:\Android\sdk\cmake\3.6.4111459\bin\cmake.exe''
[1/1] Linking CXX shared library ..\..\..\..\build\intermediat
es\cmake\debug\obj\armeabi\libnative-lib.so
FAILED: cmd.exe /C "cd . && Z:\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=armv5te-none-linux-androideabi --gcc-toolchain=Z:/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64 --sysroot=Z:/Android/sdk/ndk-bundle/sysroot -fPIC -isystem Z:/Android/sdk/ndk-bundle/sysroot/usr/include/arm-linux-androideabi -D__ANDROID_API__=14 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -frtti -fexceptions -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a --sysroot Z:/Android/sdk/ndk-bundle/platforms/android-14/arch-arm -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ..\..\..\..\build\intermediates\cmake\debug\obj\armeabi\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -llog -lm "Z:/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/libgnustl_static.a" "-latomic" && cd ."
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:27: error: undefined reference to 'DetectionBasedTracker::Parameters::Parameters()'
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:30: error: undefined reference to 'DetectionBasedTracker::DetectionBasedTracker(std::string const&, DetectionBasedTracker::Parameters const&)'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeCreateObject+0xe4): error: undefined reference to 'typeinfo for cv::Exception'
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:54: error: undefined reference to 'DetectionBasedTracker::getParameters()'
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:56: error: undefined reference to 'DetectionBasedTracker::setParameters(DetectionBasedTracker::Parameters const&)'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeSetDetectionSize+0xa4): error: undefined reference to 'typeinfo for cv::Exception'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeDestroyObject+0xa4): error: undefined reference to 'typeinfo for cv::Exception'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeStart+0xa4): error: undefined reference to 'typeinfo for cv::Exception'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:188: error: undefined reference to 'cv::_OutputArray::_OutputArray(cv::Mat&)'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:188: error: undefined reference to 'cv::Mat::copyTo(cv::_OutputArray const&) const'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:298: error: undefined reference to 'cv::Mat::copySize(cv::Mat const&)'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:27
8: error: undefined reference to 'cv::fastFree(void*)'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:367: error: undefined reference to 'cv::Mat::deallocate()'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
:app:externalNativeBuildDebug FAILED
:app:externalNativeBuildDebug (Thread[Daemon worker Thread 2,5,main]) completed. Took 8.011 secs.
:app:buildInfoGeneratorDebug (Thread[Daemon worker Thread 2,5,main]) started.
:app:buildInfoGeneratorDebug
Putting task artifact state for task ':app:buildInfoGeneratorDebug' into context took 0.0 secs.
Executing task ':app:buildInfoGeneratorDebug' (up-to-date check took 0.0 secs) due to:
Task has not declared any outputs.
:app:buildInfoGeneratorDebug (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.018 secs.
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:externalNativeBuildDebug'.
> Build command failed.
Error while executing process Z:\Android\sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {--build D:\Android\workspace\Local\Andrive\app\.externalNativeBuild\cmake\debug\armeabi --target native-lib}
[1/1] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\debug\obj\armeabi\libnative-lib.so
FAILED: cmd.exe /C "cd . && Z:\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=armv5te-none-linux-androideabi --gcc-toolchain=Z:/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64 --sysroot=Z:/Android/sdk/ndk-bundle/sysroot -fPIC -isystem Z:/Android/sdk/ndk-bundle/sysroot/usr/include/arm-linux-androideabi -D__ANDROID_API__=14 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -frtti -fexceptions -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a --sysroot Z:/Android/sdk/ndk-bundle/platforms/android-14/arch-arm -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ..\..\..\..\build\intermediates\cmake\debug\obj\armeabi\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -llog -lm "Z:/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/libgnustl_static.a" "-latomic" && cd ."
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:27: error: undefined reference to 'DetectionBasedTracker::Parameters::Parameters()'
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:30: error: undefined reference to 'DetectionBasedTracker::DetectionBasedTracker(std::string const&, DetectionBasedTracker::Parameters const&)'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeCreateObject+0xe4): error: undefined reference to 'typeinfo for cv::Exception'
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:54: error: undefined reference to 'DetectionBasedTracker::getParameters()'
D:\Android\workspace\Local\Andrive\app\src\main\cpp/native-lib.cpp:56: error: undefined reference to 'DetectionBasedTracker::setParameters(DetectionBasedTracker::Parameters const&)'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeSetDetectionSize+0xa4): error: undefined reference to 'typeinfo for cv::Exception'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeDestroyObject+0xa4): error: undefined reference to 'typeinfo for cv::Exception'
CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o(.ARM.extab.text.Java_tum_andrive_DetectionBasedTracker_nativeStart+0xa4): error: undefined reference to 'typeinfo for cv::Exception'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:188: error: undefined reference to 'cv::_OutputArray::_OutputArray(cv::Mat&)'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:188: error: undefined reference to 'cv::Mat::copyTo(cv::_OutputArray const&) const'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:298: error: undefined reference to 'cv::Mat::copySize(cv::Mat const&)'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:278: error: undefined reference to 'cv::fastFree(void*)'
D:/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/include\opencv2/core/mat.hpp:367: error: undefined reference to 'cv::Mat::deallocate()'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
Anybody please help me to setup this project!

After a lot of searching, I've found this project. So many thanks to Adrien Lescourt. This demo project describes how we can use OpenCV with Android Studio & Gradle. Problem was with jniLibs directory and CMakeLists.txt file. Here's the correct version...
app/build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "26.0.0"
defaultConfig {
applicationId "tum.andrive"
minSdkVersion 14
targetSdkVersion 19
versionCode 1
versionName "1.0"
ndk {
abiFilters "armeabi-v7a"
}
sourceSets {
main {
jniLibs.srcDirs = ['src/main/jniLibs']
}
}
externalNativeBuild {
cmake {
cppFlags "-frtti -fexceptions"
abiFilters 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'arm64-v8a', 'mips', 'mips64'
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:25.3.1'
compile project(':opencv')
}
CMakeLists.txt
cmake_minimum_required(VERSION 3.4.1)
# OpenCV stuff
include_directories(D:\\Android\\OpenCV-2.4.10-android-sdk\\sdk\\native\\jni\\include)
add_library( lib_opencv SHARED IMPORTED )
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libopencv_java.so)
add_library( native-lib
SHARED
src/main/cpp/native-lib.cpp )
find_library( log-lib
log )
target_link_libraries( native-lib
lib_opencv
${log-lib} )
And at last I've added jniLibs folder to app and copied all .so files in this folder stored in OpenCV-2.4.10-android-sdk/sdk/native/libs.
I hope this solution will help people to setup OpenCV with gradle. Please comment if any other information required.
Thanks

Link STL library with Gradle CMake project

I have simple Gradle project and trying to add native library building it using CMake
Root CMakeLists.txt
project(mine_lib)
cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
set(EXECUTABLE_OUTPUT_PATH "${PROJECT_SOURCE_DIR}/bin")
configure_file("${PROJECT_SOURCE_DIR}/src/buildinfo/buildinfo.hpp.in" "${PROJECT_BINARY_DIR}/buildinfo.hpp")
set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${warnings}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${warnings}")
add_subdirectory(${PROJECT_SOURCE_DIR}/src)
include_directories(${PROJECT_SOURCE_DIR}/src/data)
include_directories("${PROJECT_BINARY_DIR}")
add_library(mine_lib SHARED "${PROJECT_SOURCE_DIR}/src/jni/jniwrapper.c")
build.gradle
android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "..."
minSdkVersion 16
targetSdkVersion 25
versionCode 1
versionName "1.0"
defaultConfig {
externalNativeBuild {
cmake {
arguments "-DANDROID_STL=system"
cppFlags "-fexceptions"
}
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/mine_lib/CMakeLists.txt"
}
}
sourceSets {
main {
jniLibs.srcDirs 'src/main/mine_lib/src/'
}
}
}
In my native library I use part of STL library, for example cstdint. And for now I'm getting compilation error which looks like that:
Error:FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:externalNativeBuildDebug'.
> Build command failed.
Error while executing process /AndroidSDK/android-sdk-macosx/cmake/3.6.4111459/bin/cmake with arguments {--build /Users/user/IdeaProjects/Sandbox/MyApp/app/.externalNativeBuild/cmake/debug/mips64 --target mine_lib}
[1/2] Building C object CMakeFiles/mine_lib.dir/src/jni/jniwrapper.c.o
FAILED: /AndroidSDK/android-sdk-macosx/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang --target=mips64el-none-linux-android --gcc-toolchain=/AndroidSDK/android-sdk-macosx/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/darwin-x86_64 --sysroot=/AndroidSDK/android-sdk-macosx/ndk-bundle/sysroot -Dheif_EXPORTS -I/Users/user/IdeaProjects/Sandbox/HEIFGallery/app/src/main/mine_lib/src/reader -I. -isystem /AndroidSDK/android-sdk-macosx/ndk-bundle/sysroot/usr/include/mips64el-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fintegrated-as -Wa,--noexecstack -Wformat -Werror=format-security -O0 -fno-limit-debug-info -fPIC -MD -MT CMakeFiles/mine_lib.dir/src/jni/jniwrapper.c.o -MF CMakeFiles/mine_lib.dir/src/jni/jniwrapper.c.o.d -o CMakeFiles/mine_lib.dir/src/jni/jniwrapper.c.o -c /Users/user/IdeaProjects/Sandbox/MyApp/app/src/main/mine_lib/src/jni/jniwrapper.c
In file included from /Users/user/IdeaProjects/Sandbox/MyApp/app/src/main/mine_lib/src/jni/jniwrapper.c:2:
/Users/user/IdeaProjects/Sandbox/MyApp/app/src/main/mine_lib/src/data/dataparser.hpp:16:10: fatal error: 'cstdint' file not found
#include <cstdint>
^~~~~~~~~
1 error generated.
ninja: build stopped: subcommand failed.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED in 0s
What is the problem really is and how can I solve it?

Based on my understanding the problem could be solved by using a different C++ Library.
Currently you are specifying the following within the build.gradle file:
arguments "-DANDROID_STL=system"
Which, as stated within the following documentation, is:
system: The minimal system C++ runtime library and the default runtime
You'll probably need to change that to another C++ Library but I am not sure which one it would be, could be one of the gnu options. Better yet, it could be solved by removing the statement entirely.