could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libQt5WebKitWidgets.so.5

[Aman55]

Running an application in Qt 5.15.1 in debug mode gives error.(Perfectly run in normal debug run mode only problem when to do debug run).

could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libQt5WebKitWidgets.so.5
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgthread-2.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libglib-2.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libfyba.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libogdi.so.4.1
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libmfhdfalt.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libwoff2dec.so.1.0.2
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libxslt.so.1
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstapp-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstbase-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstaudio-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgsttag-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstvideo-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgstfft-1.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgobject-2.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libpulse.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/liblber.so.2
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libbrotlidec.so.1
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libnss3.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libsmime3.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libplc4.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libfyut.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libfygm.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libwoff2common.so.1.0.2
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgmodule-2.0.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/liborc-0.4.so.0
could not find '.gnu_debugaltlink' file for /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-16.1.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libbrotlicommon.so.1
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libnssutil3.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libplds4.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libcap.so.2
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgdk-3.so.0
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0
could not find '.gnu_debugaltlink' file for /usr/lib/x86_64-linux-gnu/gio/modules/libgvfsdbus.so
could not find '.gnu_debugaltlink' file for /usr/lib/x86_64-linux-gnu/gvfs/libgvfscommon.so
could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libcanberra.so.0

code is

#include <QApplication>
#include "qgsapplication.h"
#include "qgsmapcanvas.h"
#include "qgsproviderregistry.h"
#include <QMessageBox>
#include <QDebug>

int main(int argc, char *argv[]) {
    // 1. Create QApplication FIRST (Crucial!)
    QApplication a(argc, argv);  // This MUST be the very first Qt-related line

    // 2. QGIS Application Initialization
    QgsApplication* qgsApp = new QgsApplication(argc, argv, true);

    QString prefixPath = "/usr"; // Or your actual path
    qgsApp->setPrefixPath(prefixPath, true);

    qgsApp->init();

    // 3. Check Initialization (AFTER QApplication creation)
    if (QgsApplication::instance() == nullptr) {
        QMessageBox::critical(nullptr, "Error", "QGIS initialization failed!");
        return 1;
    }

    QStringList providers = QgsProviderRegistry::instance()->providerList();
    if (providers.isEmpty()) {
        QMessageBox::warning(nullptr, "Warning", "No QGIS providers found. Check prefix path.");
    } else {
        qDebug() << "Providers:" << providers;
    }

    QgsMapCanvas* mapCanvas = new QgsMapCanvas(); // Now safe to use QGIS/Qt classes
    if (mapCanvas == nullptr) {
        QMessageBox::critical(nullptr, "Error", "Failed to create map canvas.");
        delete qgsApp;
        return 1;
    }
    delete mapCanvas;

    // qDebug() << "QGIS Version:" << QGIS_VERSION; // Assuming you defined QGIS_VERSION in .pro

    QMessageBox::information(nullptr, "Success", "QGIS initialized successfully!");


    // 4. Your Application Logic Here...

    qgsApp->exit();

    return a.exec(); // Start the Qt event loop (important!)
}

[jsulm]

@Aman55 But does the application actually run in debug mode or not?

[Aman55]

@jsulm

the application run in normal " |>" mode .
but in the " |>bug" mode i got the above error.

[JonB]

@Aman55
What error? The messages you show in your first post when debugging? There is no error. For me they did not appear when I used Qt5 under Ubuntu 22.04 but all appear when I moved to Qt6 under Ubuntu 24.04. Very irritating. I raised the issue at https://askubuntu.com/questions/1526550/ubuntu-24-04-gdb-gnu-debugaltlink-missing-file-messages. No resolution, it's a change in gdb behaviour.