When using system GDB pretty printers, variable values are not properly shown in case the pretty printers return values that contain double quotes (`"`).
Attached is a simple example project to reproduce the issue.
1) make sure that the use of system GDB pretty printers is enabled at "Tools" -> "Options" -> "Debugger" -> "GDB" -> "Load system GDB pretty printers"
2) set up a project for the C++ file in the attached archive
* e.g. extract the archive containing the project and run 'make' to create the binary; then use the "Custem Executable" run configuration in Qt Creator
* alternatively: configure the use of another build system for the *.cpp file
3) set a breakpoint at the end of the main function (line 20 in 'test.cpp')
4) start debugging
5) when the breakpoint has been reached: check what Qt Creator displays as values for the variables 'first' and 'second' in the variable pane
- `My class object (name: ` is shown for both variables
- `My class object (name: ""Hello"")` should be shown for `first`
- `My class object (name: ""Bye"")` should be shown for `second`
Apparently, Qt Creator has issues with the quote returned in the 'to_string' function of the Python GDB pretty printer 'MyClassPrinter' and does not print any characters following it.
- When enabling the "Debugger Log" and manually printing the variables (using 'p first' and 'p second') there, the values are properly shown.
- It may be necessary to either adapt the path from where GDB automatically loads files ('add-auto-load-safe-path </path/to/project/directory') or manually source the 'test-gdb.py' file for the pretty printer to actually be used.
- The real world example where the issue was encountered was in LibreOffice's GDB pretty printers.