Qt 5.7.0 Android build on Linux Sig 11 error
-
I was playing around the Sig 11 error using Qt 5.7.0, this happened when we push BACK button on adnroid device.
I did not experienced that kind of error when I was using Qt 5.5.1. So I investigated further to find that the same error appeared with QT 5.6.1, so why ? I dont know, but reading QT 5 Blueprint from Packt give me a hint. Here is what I have done.
The small program that give me this error was like this:
#include "mainwindow.h"
#include <QApplication>int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}This work as mentioned with QT 5.5.1, but not on newer version.
Here is a sample of the error:
A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 14710 (QtThread)
To solve this, I modified the way that variables are set:
#include "mainwindow.h"
#include <QApplication>int main(int argc, char *argv[])
{
QApplication *a = new QApplication(argc, argv);
MainWindow *w = new MainWindow;
w->show();
int ret = a->exec();w->deleteLater(); a->deleteLater(); return ret;}
Using deleteLater as suggest in the book, no more error!
I cannot explained the difference between QT 5.5.1 and newer.
If you have any suggestions, you are welcome.
Richard
-
I forgot to add more infos.
Android:
asus/WW_K013/K013_1:5.0/LRX21V/WW_K013-12.10.1.36-20151230Slackware 14.1 64 bits.
qt-opensource-linux-x64-android-5.5.1.run
qt-opensource-linux-x64-android-5.6.1-1.run
qt-opensource-linux-x64-android-5.7.0.runNote: If I am using x86 code, no error, but it does not work with ARMv7, need more investigation on other Android version.
Richard
