[Development] QTBUG-111330: moc help needed: parsing QtDBus Q_NOREPLY

Thiago Macieira thiago.macieira at intel.com
Mon Mar 13 16:38:54 CET 2023

This is a P1 blocker for 6.5.0.

TL;DR: This is a regression; I broke parsing of previously working code and 
don't know how to fix it.

The Q_NOREPLY marker is emitted by qdbusxml2cpp to use a little known moc 
feature of extracting "tags" from meta-method declarations and having them 
available in the QMetaMethod::tag(). This has been in use in QtDBus since 4.2 
in 2006, and it's a feature that predated QtDBus. I just made use of it then.

The feature was designed based on where GCC put the __attribute__ markers and 
MSVC put the __declspec markers back in the day. It's NOT where C++11 decided 
to put the [[attribute]] markers. So when Q_DECL_DEPRECATED is [[deprecated]], 
the emitted marker was in the wrong position. Commit 
f67b32e735cbbed6848b5d40a61329f71f54a14d  fixed that by moving the 
Q_DECL_DEPRECATED to the right position, which is the left. I also moved 

That broke moc and the task was created:
"error: Not a signal or slot declaration"

So I partially reverted in 5d563135e8b32d8cd2508bcfac36561b469c3c6c because I 
didn't know how to fix moc. Now moc no longer emits that error, but produces 
nonsensical code according to the reporter.

         QtPrivate::TypeAndForceComplete<Q_NOREPLY, std::false_type>,

Since I've already moved Q_NOREPLY to where it was, I don't know what's wrong.

Thiago Macieira - thiago.macieira (AT) intel.com
  Cloud Software Architect - Intel DCAI Cloud Engineering
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