[Interest] QVariant, enums and gcc (Qt 5.5 vs 5.6 vs 5.7)

Ch'Gans chgans at gna.org
Sun Nov 27 03:05:25 CET 2016


On 27 November 2016 at 14:32, Ch'Gans <chgans at gna.org> wrote:
> On 27 November 2016 at 07:40, Thiago Macieira <thiago.macieira at intel.com> wrote:
>> On sábado, 26 de novembro de 2016 21:58:03 PST Ch'Gans wrote:
>>> So my code is build using the same gcc, but behave differently
>>> depending on the qt libraries (qt-5.6-official gives different result
>>> than qt-6.6-ubuntu).
>>> And more disturbing, linking against qt-5.5-official gives different
>>> behaviour than when linking against qt-5.6-official...
>>
>> Of course. There's a new feature in QVariant and the metatype system relating
>> to enums. So it's going to work on the newer versions but not on older ones.
>>
>> That said, the information I can find indicates the feature was introduced in
>> 5.5. So it should have worked on all of your tests. Conclusion: the problem is
>> not where you're looking.
>>
>> Please attach a simple[*] testcase so we can investigate further.
>>
>> [*] simple is: a single .cpp file, less than 200 lines of code, that compiles
>> and is self-sufficient. No need to attach the .pro file.
>
> I think i have it (monitoring QStandardItemModel::dataChanged signal),
> see attached source file (40 lines! ;)). Hopefully I'm not doing
> something stupid...
>
> Output with KUbuntu  16.10, Qt 5.6:
> Data changed QVariant(int, 2) Qt::CheckState(Unchecked)
> Data changed QVariant(int, 0) Qt::CheckState(Unchecked)
>
> Output with Official Qt 5.5 for Linux:
> Data changed QVariant(int, 2) Qt::CheckState(Unchecked)
> Data changed QVariant(int, 0) Qt::CheckState(Unchecked)
>
> Output with Official Qt 5.6 for Linux:
> Data changed QVariant(int, 2) Qt::CheckState(Checked)
> Data changed QVariant(int, 0) Qt::CheckState(Unchecked)
>
> Output with Official Qt 5.7 for Linux:
> Data changed QVariant(int, 2) Qt::CheckState(Checked)
> Data changed QVariant(int, 0) Qt::CheckState(Unchecked)

To be a bit more precise, My Qt versions are:
- Official 5.7.0
- Official 5.6.2
- Official 5.5.1
- Ubuntu 5.6.1 (not 5.6.2, yet computer is up to date)

Chris

>
> Chris
>
>
>> --
>> Thiago Macieira - thiago.macieira (AT) intel.com
>>   Software Architect - Intel Open Source Technology Center
>>
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