60 lines
2.0 KiB
Markdown
60 lines
2.0 KiB
Markdown
# qt5printers
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The `core.py`, `typeinfo.py` and `__init__.py` files are taken from patchset 2
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at https://codereview.qt-project.org/87052 and provide a GDB pretty printer for
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Qt5. These are authored by Alex Merry from the KDE project.
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## Usage
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Copy the three Python files to `~/.gdb/qt5printers/` and add this to your
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`~/.gdbinit` (or execute it from an existing `gdb` session):
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python
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import sys, os.path
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sys.path.insert(0, os.path.expanduser('~/.gdb'))
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import qt5printers
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qt5printers.register_printers(gdb.current_objfile())
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end
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Now verify it with your favorite program. Below you can find a quick test
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program.
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### Test program
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Here is a test program (save it as `test.cpp`):
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#include <QTextStream>
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void test(const QByteArray & ba) { }
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int main(void) {
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test(QByteArray("abc"));
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return 0;
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}
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Compile it with:
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g++ test.cpp $(pkg-config --cflags --libs Qt5Core) -g
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If everything goes well you should see the expanded data:
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$ gdb -q -ex break\ test -ex r ./a.out
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...
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Breakpoint 1, test (ba="abc" = {...}) at test.cpp:4
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4 test(QByteArray("abc"));
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## Background
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The Qt4 pretty printers from KDevelop[0] are not fully compatible with Qt5. For
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instance, the latest version (from December 2014) does not properly handle
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QByteArray. While these qt5printers are compatible with Qt5, it conflicts with
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Qt4 (for example, QByteArray changed in Qt 5 from Qt 4 in this commit[1]).
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See also:
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- https://bugs.kde.org/show_bug.cgi?id=331044
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- https://techbase.kde.org/Development/Tutorials/Debugging/Debugging_with_GDB
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## License
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For the applicable licenses, see the headers of the files and refer to the Qt5
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sources at https://code.qt.io/cgit/qt/qtbase.git/tree/.
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[0]: https://projects.kde.org/projects/extragear/kdevelop/kdevelop/repository/revisions/master/show/debuggers/gdb/printers
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[1]: https://code.qt.io/cgit/qt/qtbase.git/commit/src/corelib/tools/qbytearray.h?id=ad35a41739c8e1fb6db62ed37b764448b2e59ece
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