GDB Pretty Printers for Qt 6

This directory contains GDB pretty printers for displaying Qt types in a human-readable format.

Setup

Quick Setup (per session)

In GDB:

source /path/to/qgroundcontrol/tools/debuggers/gdb-pretty-printers/qt6.py

Permanent Setup

Add to your ~/.gdbinit:

python
import sys
sys.path.insert(0, '/path/to/qgroundcontrol/tools/debuggers/gdb-pretty-printers')
from qt6 import register_qt_printers
register_qt_printers(None)
end

VS Code Setup

The .vscode/launch.json in this repository is already configured to load these printers automatically.

Supported Types

Strings: QString, QByteArray
Containers: QList, QVector, QMap, QHash
Geometry: QPoint, QPointF, QSize, QSizeF, QRect, QRectF
Other: QVariant, QUrl, QSharedPointer

Example Output

(gdb) print myString
$1 = "Hello, World!"

(gdb) print myList
$2 = QList<int> (size=3)
  [0] = 1
  [1] = 2
  [2] = 3

(gdb) print myPoint
$3 = (100, 200)

(gdb) print myRect
$4 = [(0, 0) 800x600]

LLDB Support

For LLDB (macOS), Qt provides built-in formatters. You can also use:

# In ~/.lldbinit
command script import /path/to/qt6/plugins/lldb/qt6lldb.py

Or check if your Qt installation includes LLDB formatters in $QT_ROOT/plugins/lldb/.

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