Adding library dependencies to Android Shared Library project

[jsulm]

Check Qt documentation: http://doc.qt.io/qt-5/qmake-project-files.html#declaring-other-libraries

In your PRO file (I assume you're using qmake):
INCLUDEPATH += <your path>
LIBS += -L/usr/local/lib -lmath

Just change the paths and the lib name as needed.

[Igor Oliveira]

Thanks for the help, jsulm. That solved the issue!

[BrunoGeorgevich]

Hello guys, i've tried link some third-party shared libraries into my android application, but always i've encountered this three errors :

      :-1: warning: skipping incompatible /home/bruno/Documentos/Workspaces/Qt_Projects/brisa-project/platforms/qt/build-brisa/libbrisa.so while searching for brisa
      :-1: error: collect2: error: ld returned 1 exit status
      :-1: error: error: cannot find -lbrisa

i've already read a lot about this errors and i couldnt at least build the project.

i am using:
Qt 5.7 RC and QtCreator 4.0.1

BCU.pro

TEMPLATE = app

QT += qml quick widgets network xml
qtHaveModule(webengine) {
        QT += webengine
        DEFINES += QT_WEBVIEW_WEBENGINE_BACKEND
}

RESOURCES += View/qml.qrc \
    Assets/pics/pics.qrc
include(brisa.pri)

DISTFILES += Assets/TO_DO.txt \
    android/AndroidManifest.xml \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradlew \
    android/res/values/libs.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew.bat

HEADERS += \
    Controller/controlpointbcu.h \
    Controller/dataobject.h \
    Controller/filedownloader.h \
    Controller/folderCompressor.h \
    Controller/essencials/qqmlhelpers.h \
    Controller/essencials/qqmlobjectlistmodel.h

SOURCES += Controller/main.cpp \
    Controller/controlpointbcu.cpp \
    Controller/dataobject.cpp \
    Controller/filedownloader.cpp \
    Controller/folderCompressor.cpp \
    Controller/essencials/qqmlhelpers.cpp \
    Controller/essencials/qqmlobjectlistmodel.cpp

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
    ANDROID_EXTRA_LIBS = \
        $$PWD/../../build-brisa/libbrisa.so
}

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

---

brisa.pri

BASEDIR_BRUNO = /home/bruno/Documentos/Workspaces/Qt_Projects/brisa-project/platforms/qt
BASEDIR_MAC = /Users/compemac2/brisa-project/platforms/qt/build-brisa-iphonesimulator_clang_Qt_5_5_1_for_iOS-Debug/

INCLUDEPATH += $$BASEDIR_BRUNO/lib/include
LIBS += -L$$BASEDIR_BRUNO/build-brisa -lbrisa

---

Compile Output

23:10:40: Running steps for project BCU...
23:10:40: Configuration unchanged, skipping qmake step.
23:10:40: Starting: "/usr/bin/make" 
/home/bruno/Documentos/Qt/5.7/android_armv7/bin/qmake -spec android-g++ -o Makefile ../BCU/BCU.pro
/home/bruno/Documentos/Android/android-ndk-r11c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ --sysroot=/home/bruno/Documentos/Android/android-ndk-r11c/platforms/android-9/arch-arm/ -Wl,-soname,libBCU.so -Wl,-rpath=/home/bruno/Documentos/Qt/5.7/android_armv7/lib -Wl,--no-undefined -Wl,-z,noexecstack -shared -o libBCU.so main.o controlpointbcu.o dataobject.o filedownloader.o folderCompressor.o qqmlhelpers.o qqmlobjectlistmodel.o qrc_qml.o qrc_pics.o moc_controlpointbcu.o moc_dataobject.o moc_filedownloader.o moc_folderCompressor.o moc_qqmlhelpers.o moc_qqmlobjectlistmodel.o   -L/home/bruno/Documentos/Android/android-ndk-r11c/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a -L/home/bruno/Documentos/Android/android-ndk-r11c/platforms/android-9/arch-arm//usr/lib -L/home/bruno/Documentos/Workspaces/Qt_Projects/brisa-project/platforms/qt/build-brisa -lbrisa -L/home/bruno/Documentos/Qt/5.7/android_armv7/lib -lQt5Quick -L/opt/android/ndk/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a -L/opt/android/ndk/platforms/android-9/arch-arm//usr/lib -lQt5Widgets -lQt5Gui -lQt5Qml -lQt5Network -lQt5Xml -lQt5Core -lGLESv2 -lgnustl_shared -llog -lz -lm -ldl -lc -lgcc
/home/bruno/Documentos/Android/android-ndk-r11c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: warning: skipping incompatible /home/bruno/Documentos/Workspaces/Qt_Projects/brisa-project/platforms/qt/build-brisa/libbrisa.so while searching for brisa
Makefile:251: recipe for target 'libBCU.so' failed
/home/bruno/Documentos/Android/android-ndk-r11c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lbrisa
main.o:main.cpp:function main: error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::start()'
main.o:main.cpp:function main: error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::discover()'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::deviceRemoved(QString): error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::deviceGone(QString)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::ControlPointBCU(QQmlApplicationEngine*, QObject*, QString, int): error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::ControlPoint(QObject*, QString, int)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::ControlPointBCU(QQmlApplicationEngine*, QObject*, QString, int): error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::~ControlPoint()'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::controlpoint::Device::Device(QTemporaryFile*, QUrl*, QObject*)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::controlpoint::Device::getAttribute(brisa::upnp::controlpoint::Device::xmlTags)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::controlpoint::Device::getAttribute(brisa::upnp::controlpoint::Device::xmlTags)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::controlpoint::Device::getServiceList()'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::AbstractService::getAction(QString const&)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::controlpoint::Service::call(QString const&, QMap<QString, QString>&)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::AbstractService::setAttribute(brisa::upnp::AbstractService::xmlTags, QString const&)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::replyFinished(QNetworkReply*): error: undefined reference to 'brisa::upnp::AbstractService::setAttribute(brisa::upnp::AbstractService::xmlTags, QString const&)'
controlpointbcu.o:controlpointbcu.cpp:function ControlPointBCU::decodeJsonList(): error: undefined reference to 'brisa::upnp::controlpoint::Device::getAttribute(brisa::upnp::controlpoint::Device::xmlTags)'
moc_controlpointbcu.o:moc_controlpointbcu.cpp:function ControlPointBCU::~ControlPointBCU(): error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::~ControlPoint()'
moc_controlpointbcu.o:moc_controlpointbcu.cpp:function QMetaTypeIdQObject<brisa::upnp::controlpoint::Device*, 8>::qt_metatype_id(): error: undefined reference to 'brisa::upnp::controlpoint::Device::staticMetaObject'
moc_controlpointbcu.o:moc_controlpointbcu.cpp:function ControlPointBCU::qt_metacast(char const*): error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::qt_metacast(char const*)'
moc_controlpointbcu.o:moc_controlpointbcu.cpp:function ControlPointBCU::qt_metacall(QMetaObject::Call, int, void**): error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::qt_metacall(QMetaObject::Call, int, void**)'
moc_controlpointbcu.o:moc_controlpointbcu.cpp:typeinfo for ControlPointBCU: error: undefined reference to 'typeinfo for brisa::upnp::controlpoint::ControlPoint'
moc_controlpointbcu.o:moc_controlpointbcu.cpp:ControlPointBCU::staticMetaObject: error: undefined reference to 'brisa::upnp::controlpoint::ControlPoint::staticMetaObject'
collect2: error: ld returned 1 exit status
make: *** [libBCU.so] Error 1
23:10:40: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project BCU (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.7.0))
When executing step "Make"
23:10:40: Elapsed time: 00:00.

Please, anyone can help me?
Sorry about the english =B

[jsulm]

@BrunoGeorgevich For which architecture is that library built? Is it for ARMv7? Which compiler was used to build it?
You can check this with:

file /home/bruno/Documentos/Workspaces/Qt_Projects/brisa-project/platforms/qt/build-brisa/libbrisa.so

[BrunoGeorgevich]

@jsulm the architecture is arm v7 and the compiler is GCC 5.2. That library really exists, but I didn't understand what you wanna say with "you can check this with". Again, I'm sorry about the English.

This shared library works when I built the project for desktop, using the GCC compiler, but with Android occurres this errors mentioned above.

[jsulm]

@BrunoGeorgevich I mean: can you please execute this line on the command line and post its output here?

file /home/bruno/Documentos/Workspaces/Qt_Projects/brisa-project/platforms/qt/build-brisa/libbrisa.so

You cannot use the same library binary on desktop and Android/ARM! (unless your desktop is ARM as well)

[BrunoGeorgevich]

@jsulm so, I've need to recompile my shared library to Arm v7? How can I turn this binares compatible with Arm V7?

[jsulm]

@BrunoGeorgevich You have to build this library for ARMv7 or get a build for ARMv7 from somewhere. You cannot turn a x86 binary into ARMv7 binary.

[BrunoGeorgevich]

@jsulm Do you know what i need do add to my qmake to compile this lib to ARM v7?

QT       += core network xml gui

CONFIG   += console
CONFIG   += qt warn_on
CONFIG   += hardening
CONFIG   -= app_bundle

TEMPLATE = lib

TARGET = brisa

INCLUDEPATH += "include"
INCLUDEPATH += "src"

#!exists( brisa.pri ) {
! brisa.pri {
    message("Creating the brisa.pri configuration file. Do not edit this file.")
    system(python scripts/gen_brisa_pri.py)
    QMAKE_CLEAN += brisa.pri
}

HEADERS += \
   //all .h

SOURCES += \
    //all .cpp

I never do something like this, to compile a lib to ARM v7. The code above is the .pro of the lib. What i need to add to this code, to compile it to ARM v7?

[Pablo J. Rogina]

@Igor-Oliveira what about this document: Compiling QT-Brisa to Android and generate the Apk File?
I didn't try the whole process, but as a result of the build steps, I'd expect the libbrisa.so for Android built somewhere in your workspace...

[jsulm]

@BrunoGeorgevich You don't have to change anything there. You have to use qmake and make from your ARMv7 build environment.

[BrunoGeorgevich]

@jsulm thanks bro. I, as you Said, just needed to built my lib to arm v7, before add it to my project. Thanks!