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Semantic analysis KDevelop

Am I the only one having problem since month with the semantic analysis of Kdevelop
https://i.imgur.com/CxKVYh8.png (needless to say Task is a QObject and the code compile and execute correctly)

Switching "compiler for path" from clang to gcc does not help
Any idea as of why is that welcome 

No LSB modules are available.
Distributor ID: neon
Description:    KDE neon LTS User Edition 5.12
Release:        16.04
Codename:       xenial
Linux zalman 4.13.0-43-generic #48~16.04.1-Ubuntu SMP Thu May 17 12:56:46 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
konsole 18.04.2
QMake version 3.1
Using Qt version 5.9.3 in /usr/lib/x86_64-linux-gnu