How to solve undefined refrence error on android libtorch? - android-ndk

Question

i got some issue on android libtorch
when i build my project, it always says to "C/C++: C:/Users/Administrator/AndroidStudioProjects/CardFinder/app/src/main/cpp/native-lib.cpp:26: error: undefined reference to 'torch::cuda::is_available()'"
i've never seen that before on visual studio
here's my android studio setting
'Cmake'
cmake_minimum_required(VERSION 3.18)
project(cardfinder)
set(CMAKE_CXX_STANDARD 14)
set(pathInclude ${CMAKE_SOURCE_DIR}/include)
add_library(native-lib SHARED ${CMAKE_SOURCE_DIR}/native-lib.cpp)
file(GLOB OPENCV_INCLUDE_DIRS "${pathInclude}/opencv")
file(GLOB PYTORCH_INCLUDE_DIRS "${pathInclude}/libtorch")
file(GLOB PYTORCH_API_DIRS "${pathInclude}/libtorch/torch/csrc/api/include")
file(GLOB SOURCE_INCLUDE_DIRS "${pathInclude}/source")
file(GLOB LINK_DIRS "${CMAKE_SOURCE_DIR}/../jniLibs/${ANDROID_ABI}")
include_directories(
${OPENCV_INCLUDE_DIRS}
${PYTORCH_INCLUDE_DIRS}
${PYTORCH_API_DIRS}
${SOURCE_INCLUDE_DIRS})
find_library(
OPENCV_LIBRARY opencv_java4
PATHS ${LINK_DIRS}
NO_CMAKE_FIND_ROOT_PATH)
find_library(
PYTORCH_LIBRARY pytorch_jni
PATHS ${LINK_DIRS}
NO_CMAKE_FIND_ROOT_PATH)
find_library(
FBJNI_LIBRARY fbjni
PATHS ${LINK_DIRS}
NO_CMAKE_FIND_ROOT_PATH)
find_library(log-lib log)
target_link_libraries(
native-lib
${OPENCV_LIBRARY}
${FBJNI_LIBRARY}
${PYTORCH_LIBRARY}
${log-lib}
)
'build.gradle'
plugins {
id 'com.android.application'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.main.cardfinder"
minSdk 21
targetSdk 32
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags '-std=c++14'
}
}
ndkVersion "21.1.6352462"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
externalNativeBuild {
cmake {
path file('src/main/cpp/CMakeLists.txt')
version '3.18.1'
}
}
buildFeatures {
viewBinding true
}
}
dependencies {
implementation 'androidx.appcompat:appcompat:1.5.1'
implementation 'com.google.android.material:material:1.6.1'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
def cameraxVersion = "1.1.0-alpha05"
implementation "androidx.camera:camera-core:${cameraxVersion}"
implementation "androidx.camera:camera-camera2:${cameraxVersion}"
implementation "androidx.camera:camera-lifecycle:${cameraxVersion}"
// CameraX View class
implementation 'androidx.camera:camera-view:1.0.0-alpha25'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
'my current project'