[kmymoney] [Bug 499752] New: The debugger (gdb) cannot display values of instances of the MyMoneyMoney class

[Ralf Habacker]

https://bugs.kde.org/show_bug.cgi?id=499752

            Bug ID: 499752
           Summary: The debugger (gdb) cannot display values of instances
                    of the MyMoneyMoney class
    Classification: Applications
           Product: kmymoney
           Version: 5.1.92
          Platform: Other
                OS: All
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: buildsystem
          Assignee: kmymoney-devel at kde.org
          Reporter: ralf.habacker at freenet.de
  Target Milestone: ---

SUMMARY
The class MyMoneyMoney is an elementary class and is used very often in the
source code. Since the contained value is hidden inside, it cannot be displayed
directly in debuggers such as gdb, kdevelop or QtCreator, which makes debugging
more difficult. Outputs must therefore be generated manually by adding debug
outputs, e.g. with `qDebug() << instance.toDouble()` or in the gdb window with
`p instance.toDouble()`. It would speed up debugging if there is corresponding
support for debuggers. 

STEPS TO REPRODUCE
1. build kmymoney from source (git master branch) with debug information
included
2. run 
```
gdb <builddir>/bin/kmymoney
(gdb) b main
(gdb) r
(gdb) b MyMoneyMoney::One
```
3.  inspect debugger output

OBSERVED RESULT
The debugger displays a lot of data, but not the relevant value:
```
(gdb) p MyMoneyMoney::ONE
$1 = {<AlkValue> = {d = {d = 0x87f300}}, _vptr.MyMoneyMoney = 0x7ffff78b18c0
<vtable for MyMoneyMoney+16>, static maxValue = {<AlkValue> = {d = {d =
0x8807e0}}, 
    _vptr.MyMoneyMoney = 0x7ffff78b18c0 <vtable for MyMoneyMoney+16>, static
maxValue = <same as static member of an already seen type>, static minValue =
{<AlkValue> = {d = {d = 0x880810}}, 
      _vptr.MyMoneyMoney = 0x7ffff78b18c0 <vtable for MyMoneyMoney+16>, static
maxValue = <same as static member of an already seen type>, 
      static minValue = <same as static member of an already seen type>, static
autoCalc = {<AlkValue> = {d = {d = 0x8807b0}}, _vptr.MyMoneyMoney =
0x7ffff78b18c0 <vtable for MyMoneyMoney+16>, 
        static maxValue = <same as static member of an already seen type>,
static minValue = <same as static member of an already seen type>, 
        static autoCalc = <same as static member of an already seen type>,
static ONE = {<AlkValue> = {d = {d = 0x87f300}}, _vptr.MyMoneyMoney =
0x7ffff78b18c0 <vtable for MyMoneyMoney+16>, 
          static maxValue = <same as static member of an already seen type>,
static minValue = <same as static member of an already seen type>, 
          static autoCalc = <same as static member of an already seen type>,
static ONE = <same as static member of an already seen type>, static MINUS_ONE
= {<AlkValue> = {d = {d = 0x87f3f0}}, 
            _vptr.MyMoneyMoney = 0x7ffff78b18c0 <vtable for MyMoneyMoney+16>,
static maxValue = <same as static member of an already seen type>, 
            static minValue = <same as static member of an already seen type>,
static autoCalc = <same as static member of an already seen type>, 
            static ONE = <same as static member of an already seen type>,
static MINUS_ONE = <same as static member of an already seen type>}}, 
        static MINUS_ONE = <same as static member of an already seen type>},
static ONE = <same as static member of an already seen type>, 
      static MINUS_ONE = <same as static member of an already seen type>},
static autoCalc = <same as static member of an already seen type>, 
    static ONE = <same as static member of an already seen type>, static
MINUS_ONE = <same as static member of an already seen type>}, 
  static minValue = <same as static member of an already seen type>, static
autoCalc = <same as static member of an already seen type>, static ONE = <same
as static member of an already seen type>, 
  static MINUS_ONE = <same as static member of an already seen type>}
```

EXPECTED RESULT
Instead, the debugger should display the value contained in the named instance
```
(gdb) p MyMoneyMoney::ONE
$1 = 1
```
SOFTWARE/OS VERSIONS
Operating System: openSUSE Leap 15.6
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12

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