error at run-time: QWidget: Cannot create a QWidget without QApplication

Operating System Info

Other

Other OS

FreeBSD 15

OBS Studio Version

32.0.4

OBS Studio Version (Other)

No response

OBS Studio Log URL

n/a

OBS Studio Crash Log URL

No response

Expected Behavior

no abort

Current Behavior

$ obs
Gtk-Message: 03:21:59.947: Failed to load module "colorreload-gtk-module"
Qt: Session management error: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
debug: Attempted path: /usr/local/bin/../share/obs/obs-studio/locale/en-US.ini
debug: Attempted path: /usr/local/bin/../share/obs/obs-studio/locale.ini
debug: Attempted path: /usr/local/bin/../share/obs/obs-studio/themes
debug: Attempted path: /usr/local/bin/../share/obs/obs-studio/themes/
warning: Get on org.freedesktop.portal.Settings returned an invalid reply
warning: Crash or unclean shutdown detected
QWidget: Cannot create a QWidget without QApplication
Abort trap                 obs

Steps to Reproduce

build+run

Anything else we should know?

The problem disappears when compiled with debug options.

The stack trace of abort is:

Thread 1 hit Breakpoint 1.5, 0x0000000805958534 in abort () from /lib/libc.so.7
(gdb) bt
#0  0x0000000805958534 in abort () at /lib/libc.so.7
#1  0x000000080527ce9d in ??? () at /usr/local/lib/qt6/libQt6Core.so.6
#2  0x00000008052950df in ??? () at /usr/local/lib/qt6/libQt6Core.so.6
#3  0x000000080529b0d8 in QMessageLogger::fatal(char const*, ...) const () at /usr/local/lib/qt6/libQt6Core.so.6
#4  0x000000080412f58e in QWidgetPrivate::init(QWidget*, QFlags<Qt::WindowType>) () at /usr/local/lib/qt6/libQt6Widgets.so.6
#5  0x000000080436ccce in QDialog::QDialog(QDialogPrivate&, QWidget*, QFlags<Qt::WindowType>) () at /usr/local/lib/qt6/libQt6Widgets.so.6
#6  0x000000080439eaa6 in QMessageBox::QMessageBox(QWidget*) () at /usr/local/lib/qt6/libQt6Widgets.so.6
#7  0x0000000000655c22 in ??? ()
#8  0x0000000000648c3e in ??? ()
#9  0x000000080587b26f in __libc_start1 () at /lib/libc.so.7
#10 0x00000000003e3004 in ??? ()
(gdb)

It seems like it attempts to show some message box without having QApplication object.

Start by reproducing the abort on FreeBSD 15 with a non-debug build, then inspect the startup path around the QMessageBox and QWidget frames shown in the stack trace. Compare the debug and release builds to identify why a QWidget is created before QApplication. Done means OBS starts without the abort and the relevant startup behavior remains intact.