All .h files have a warning for Q_OBJECT

mrjj

ok so it sounds like your
Qt installation was damaged somehow.

When did it start ?
Did you upgrade Qt version or how/when did error start to come?

gabor53

It started when I added a few components to the installation. I guess I have to teinstall Qt.

gabor53

I reinstalled Qt 5.8 several times. The latest is from the online installer. I still have the same error message. I'm running MinGW 32 bit. I tried several examples from Qt, but I keep getting the same error message. Any idea what is going on? Thank you.

mrjj

@gabor53
Hi
Is Qt5.8 mingw the only Qt you have installed ?
There is no other Qt or compiler installed ?

I have never seen this error nor does google so I am bit lost on what it can be.
Only clue is ClangCodeModel.
Check is DISABLED at
Help > About Plugins > C++ > ClangCodeModel

Chris Kawa

It's a bug: QTCREATORBUG-17518.
You don't need to disable clang model. To workaround go to Tools->Options->C++->Code Model, press Copy to create a custom config, add -Wno-unknown-pragmas to the config text, apply and restart QtCreator. The warning should go away.

gabor53

I had to disable the ClangCodeModel to get rid of the warning. No other methods worked. Thank you for your help.

deleted515

@Chris-Kawa This helped me get rid of the warning. Thank you very much.

nslw

The workaround from @Chris-Kawa is not working for me properly.
First in Qt Creator 10.0.0 the path is Edit->Preferences->C++->Clangd->Build-system warnings.
Second it suppresses all diagnostics from the build system, that's why it's not showing the warning anymore.

The only workaround that I've found is to disable "-Wsuggest-override" completely from the clangd checks by editing .clangd file in the project root directory and adding there

CompileFlags:
  Remove: [-Wsuggest-override]

Chris Kawa

@nslw said:

The workaround from @Chris-Kawa is not working for me properly.

It's been 6 years. Things change ;)

In year 2023 go to Edit->Preferences->C++->Clangd->Build-system and make a copy of the "Build-system warnings" configuration. In its properties add -Wno-inconsistent-missing-override. This will disable this particular waning from clangd, but it will also come from the build system, so you have to disable it there too. How you do it will depend on your compiler and build tool. For example if you use qmake and gcc you can add QMAKE_CXXFLAGS += -Wno-inconsistent-missing-override in the .pro file.

nslw

@Chris-Kawa said in All .h files have a warning for Q_OBJECT:

@nslw said:

The workaround from @Chris-Kawa is not working for me properly.

It's been 6 years. Things change ;)

This hasn't changed though ;) Your workaround still doesn't work for me, because the warning comes from -Wsuggest-override and not from -Winconsistent-missing-override. Adding -Wno-inconsistent-missing-override, as you suggest, doesn't help at all and just cripples clangd more, as it stops reporting inconsistent missing overrides.

I use CMake, and add

set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wsuggest-override")

but I have to disable it in clangd, as I described earlier. This fixes it for me in QtCreator. I get no warnings from -Wsuggest-override (bad), but I still get non-purposedly-hidden/overriden warnings from -Winconsistent-missing-override (good).

Chris Kawa

@nslw Then replace -Wno-inconsistent-missing-override with -Wno-suggest-override in the settings I mentioned.