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Type: Bug
Resolution: Incomplete
Priority: Not Evaluated
Fix Version/s: None
Affects Version/s: 5.13.0
Component/s: Build System
Labels:
None
Environment:
Qt 5.13.0
Android 9

Platform/s:

Android

First, the work environment configuration is QT 5.13.0 with NDK_r18b and SDK_r24.4.1.

Based on this environment, I open an old program (This old program is used on QT 5.11. ). Then build it , there is no error. But when I build it on the phone , an error occured, like this:

E AndroidRuntime: FATAL EXCEPTION: qtMainLoopThread
E AndroidRuntime: FATAL EXCEPTION: qtMainLoopThread
E AndroidRuntime: Process: com.roflying.mobile.gcs, PID: 9127
E AndroidRuntime: java.lang.UnsatisfiedLinkError: dlopen failed: library "libgnustl_shared.so" not found
E AndroidRuntime:  at java.lang.Runtime.load0(Runtime.java:928)
E AndroidRuntime:  at java.lang.System.load(System.java:1633)
E AndroidRuntime:  at org.qtproject.qt5.android.QtNative$3.run(QtNative.java:236)
E AndroidRuntime:  at org.qtproject.qt5.android.QtThread$2.run(QtThread.java:87)
E AndroidRuntime:  at org.qtproject.qt5.android.QtThread$1.run(QtThread.java:61)
E AndroidRuntime:  at java.lang.Thread.run(Thread.java:764)

Then I go to find this "libgnustl_shared.so" library in the libs file, it is really not exist in that. And in this issue[https://developer.android.com/ndk/guides/cpp-support.html,] I know libc++ is the only STL available in the NDK begin NDK r18. As a rule, Qt can auto call the "libc++_shared.so", not the "libgnustl_shared.so" library . But in fact, the program is actually finding the "libgnustl_shared.so",at last ,this library is not found.

There is my build.gradle:

buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.3'
    }
}

allprojects {
    repositories {
        jcenter()
        flatDir {
            dirs 'libs' // 该目录用于引入video sdk的aar文件
        }
    }
}

apply plugin: 'com.android.application'

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile "commons-io:commons-io:2.5" // 必须引入
	compile files('libs/libammsdk.jar')
    // sdk库文件
    compile(name: 'uartVideo-release', ext: 'aar')
    compile(name: 'fpvlibrary-v1.0.2', ext: 'aar')
}

android {
    /*******************************************************
     * The following variables:
     * - androidBuildToolsVersion,
     * - androidCompileSdkVersion
     * - qt5AndroidDir - holds the path to qt android files
     *                   needed to build any Qt application
     *                   on Android.
     *
     * are defined in gradle.properties file. This file is
     * updated by QtCreator and androiddeployqt tools.
     * Changing them manually might break the compilation!
     *******************************************************/

    compileSdkVersion androidCompileSdkVersion.toInteger()

    buildToolsVersion androidBuildToolsVersion

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = [qt5AndroidDir + '/src', 'src', 'java']
            aidl.srcDirs = [qt5AndroidDir + '/src', 'src', 'aidl']
            res.srcDirs = [qt5AndroidDir + '/res', 'res']
            resources.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            assets.srcDirs = ['assets']
            jniLibs.srcDirs = ['libs']
       }
    }

    lintOptions {
        abortOnError false
    }

}

And this is my *.pro file:

QT += quick \
    gui \
    widgets \
    sql \
    network \
    location-private \
    positioning-private \
    xml \
    core \
    texttospeech \
    qml

CONFIG += c++11
#CONIFG += qtquickcompiler

TEMPLATE = app
TARGET = HK-GCS

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

QMAKE_PROJECT_DEPTH = 0

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

linux-g++-64 {
    message(Linux build x64_86)
    CONFIG += LinuxBuild
    DEFINES += Q_LINUX_64
    DISTRO = $$system(lsb_release -i)
    contains( DISTRO, "Ubuntu" ) {
         DEFINES += Q_UBUNTU
    }
}
else: linux-g++ {
    message(Linux build x86)
    CONFIG += LinuxBuild
    DEFINES += Q_LINUX_32
    DISTRO = $$system(lsb_release -i)
    contains( DISTRO, "Ubuntu" ) {
         DEFINES += Q_UBUNTU
    }
}
else : win32-msvc2015 {
    message(Windows build 2015)
    CONFIG += WindowsBuild
    DEFINES += WindowsBuild
}else : win32-x-g++|win64-x-g++ {
    message(Windows Cross Build)
    CONFIG += WindowsCrossBuild
    DEFINES += WindowsCrossBuild
}

else : android-g++ {
    message(Android Build)
    CONFIG += AndroidBuild
    DEFINES += AndroidBuild
}
else : android-clang{
    message(Android Build)
    CONFIG += AndroidBuild
    DEFINES += AndroidBuild
}
else {
    error(Unsupported build type)
}


!iOSBuild {
    OBJECTS_DIR  = $${OUT_PWD}/obj
    MOC_DIR      = $${OUT_PWD}/moc
    UI_DIR       = $${OUT_PWD}/ui
    RCC_DIR      = $${OUT_PWD}/rcc
    QMLCACHE_DIR = ./qmlCache
}

SOURCES += \
        main.cpp \

RESOURCES += file.qrc \
    qml.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =

# Default rules for deployment.
#qnx: target.path = /tmp/$${TARGET}/bin
#else: unix:!android: target.path = /opt/$${TARGET}/bin
#!isEmpty(target.path): INSTALLS += target

HEADERS += 

DISTFILES += \
    readMe \
    Android_file/gradle/wrapper/gradle-wrapper.jar \
    Android_file/gradlew \
    Android_file/res/values/libs.xml \
    Android_file/build.gradle \
    Android_file/gradle/wrapper/gradle-wrapper.properties \
    Android_file/gradlew.bat \
    Android_file/res/xml/device_filter.xml \
    Android_file/libs/d2xx.jar \
    Android_file/assets/configs_static/version_define.xml \
    Android_file/src/com/roflying/mobile/gcs/QGCActivity.java \
    Android_file/gradle/wrapper/gradle-wrapper.jar \
    Android_file/gradlew \
    Android_file/res/values/libs.xml \
    Android_file/build.gradle \
    Android_file/gradle/wrapper/gradle-wrapper.properties \
    Android_file/gradlew.bat \
    Android_file/assets/configs_static/agricultureService.json \
    Android_file/assets/configs_static/version_define.xml \
    Android_file/libs/libammsdk.jar \
    Android_file/AndroidManifest.xml \

AndroidBuild{
    message(+++++++++++++++++++++++++++++++++++++++++++++++)
    message(Android libs files)
    message(+++++++++++++++++++++++++++++++++++++++++++++++)

    include(Libs\qtandroidserialport\src\qtandroidserialport.pri)
    QT += androidextras \
            bluetooth

    HEADERS += Model/FounditionExtend/Link/LinkConfiguration.h \
                Model/FounditionExtend/Link/rbluetoothlink.h

    SOURCES += Model/FounditionExtend/Link/LinkConfiguration.cc \
                Model/FounditionExtend/Link/rbluetoothlink.cc

    contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
        ANDROID_EXTRA_LIBS = \
        $$PWD/Libs/ffmpeg/libs/android/libavcodec.so\
        $$PWD/Libs/ffmpeg/libs/android/libavfilter.so\
    }
    ANDROID_PACKAGE_SOURCE_DIR = $$PWD/Android_file
}

And all of the version code , minimum required and target SDK version are 21.

These are details of my question.

And I want to know why is Qt finding the "libgnustl_shared.so" library , and how can I solve this problem?

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