"Segmentation fault (core dumped)" error after running executable file on the Android device (using Android Clang (C++,aarch64) compiler)

morteza ali ahmadi

Hi, I have a simple Qt code (main.cpp) as follow which I want to run in my Android device:

#include <QCoreApplication>
#include <QDebug>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug()<<"The program starts successfully.";
    return a.exec();
}

1- At first, I have put this code within a Qt console project and I have used qmake to create Makefile. After compiling, Qt just outputs *.apk and *.so files from my project but I need executable output. Here is my project *.pro:

QT -= gui

CONFIG += c++11 console
CONFIG -= app_bundle

TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
        main.cpp

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

and I have:

Java ver 1.8.0_242: /usr/lib/jvm/java-8-openjdk-amd64
SDK ver 25.2.5: /home/***/Android/Android/Sdk
NDK ver 20.0.5594570: /home/***/Android/Android/Sdk/ndk-bundle

2- In order to produce executable file, I have used Android Clang (C++,aarch64) compiler in a ubuntu terminal by running this command:

/home/***/Android/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ \
-D__ANDROID_API__=21 \
-target aarch64-none-linux-android \
-gcc-toolchain /home/***/Android/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64 \
-fno-limit-debug-info \
-DANDROID_HAS_WSTRING \
--sysroot=/home/***/Android/Android/Sdk/ndk-bundle/platforms/android-21/arch-arm64 \
-isystem /home/***/Android/Android/Sdk/ndk-bundle/sysroot/usr/include/aarch64-linux-android \
-isystem /home/***/Android/Android/Sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/include \
-isystem /home/***/Android/Android/Sdk/ndk-bundle/sources/android/support/include \
-isystem /home/***/Android/Android/Sdk/ndk-bundle/sources/cxx-stl/llvm-libc++abi/include \
-fstack-protector-strong -DANDROID -g -g -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_CORE_LIB \
-I/home/***/Qt5.12.7/5.12.7/android_arm64_v8a/mkspecs/android-clang \
-I/home/***/Qt5.12.7/5.12.7/android_arm64_v8a/include \
-I/home/***/Qt5.12.7/5.12.7/android_arm64_v8a/include/QtCore \
-I/home/***/Android/Android/Sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/include \
-I/home/***/Android/Android/Sdk/ndk-bundle/sysroot/usr/include \
-L/home/***/Android/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android/21 \
-L/home/***/Android/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android \
-L/home/***/Qt5.12.7/5.12.7/android_arm64_v8a/lib \
main.cpp \
-lc++ -lc++_shared -lQt5Core \
-o executableMain

I have used some of the flags and include directories from Makefile in Step 1. After compiling, I can procude an executable file (executableMain). And also here is the results of file executableMain and file libc++_shared.so and file libQt5Core.so respectively:

executableMain: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /system/, with debug_info, not stripped
libc++_shared.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=a9c0aad7747976d255d9ea273f6f4c5003901317, stripped
libQt5Core.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, for GNU/Linux 2.6.28, with debug_info, not stripped

3- Now, I want to run the executableMain file in my Android device using adb shell. So, I have copied libc++_shared.so and libQt5Core.so to /System/lib64/ of my Android device and executableMain to a subfolder of /data/user/0. But after setting permission to executableMain (chmod 777 executableMain), running ./executableMain shows the following error:

Segmentation fault (core dumped)

How can I solve that?

jsulm

@morteza-ali-ahmadi The APK contains your executable. You can simply deploy it through QtCreator to your device and start.
"How can I solve that?" - use debugger to see where it crashes and how stack trace looks like (you can post it here).

morteza ali ahmadi

@jsulm I can simply deploy the apk app through QtCreator to my device and start but I want to get the executable output (in Linux without any extension and in windows with *.exe extension). Then I want to run the executable file from adb shell. Because finally, my executable file will be started from another android apk as a external process. So I need a executable format.

Where can I use debugger? (Because this error is appeared on adb shell of my Android device)

jsulm

@morteza-ali-ahmadi said in "Segmentation fault (core dumped)" error after running executable file on the Android device (using Android Clang (C++,aarch64) compiler):

Where can I use debugger?

In QtCreator.

You can open APK (it is an archive) and extract the executable from there. Keep in mind there will not be any.exe extension as it does not have anything to do with Windows.

morteza ali ahmadi

@jsulm Thanks, I can extract it but there are some *.so files in lib folder (and also there are some folders like assets, META-INF and ...) and there is no executable file.

morteza ali ahmadi

@jsulm Can you help me?

jsulm

@morteza-ali-ahmadi I'm not an Android expert. Maybe somebody else knows more.