What could cause clang to error, but gcc compiles it anyway?

mchinand

Do have the Q_OBJECT macro in your XMUI header?

fcarney

@mchinand It doesn't matter if I have Q_OBJECT in there (it does). Compiling with a different Kit made all the errors disappear. I have something wrong with my Kit or Arm compiler installation. The gcc kit for the OS doesn't cause this. The Arm kit does. Strangely, a guy I work with has same exact kit and doesn't see these errors when compiling to Arm.

@kshegunov
I will have to research what "code model" means and why it might affect the error messages. Thanks for the tip.

fcarney

Now I tested with minimal project same kit (Arm):

#include <QCoreApplication>
#include <QObject>

class TestObj: public QObject
{
    Q_OBJECT

public:
    TestObj(QObject* parent=nullptr){

    }

signals:
    void doexit(int code);
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    TestObj testobj;

    QObject::connect(&testobj, &TestObj::doexit, qApp, &QCoreApplication::exit);
    QObject::connect(&testobj, SIGNAL(doexit()), qApp, SLOT(exit()));

    return a.exec();
}

#include "main.moc"

No errors at all. So that leads me to believe something in the original arm project is causing this with the arm kit.

I tried resetting the code model and it seemed to have no effect on the errors.

fcarney

I found an error in my kit. The qmake was pointing to a qmake in another directory than the compiler directories. The kits were identical. However, this did not make the errors go away. Now, if I compile it never produces those errors. But if I run qmake it does a lot of thinking and then puts those errors in the log window. The errors around the actual code never go away. I am going to try updating qt creator next. Really baffled as to what I am even looking at.

kshegunov

@fcarney said in What could cause clang to error, but gcc compiles it anyway?:

Really baffled as to what I am even looking at.

Open the documentation for Creator and check how to disable the clang code model (I think it was disabling the plugin somewhere in the menus). Report back whether the 'errors' went away.

fcarney

@kshegunov said in What could cause clang to error, but gcc compiles it anyway?:

Report back whether the 'errors' went away.

The errors are no more. qmake and rebuild.

kshegunov

If you still want to use it, tweak the flags to suit your need after re-enabling:
https://doc.qt.io/qtcreator/creator-clang-codemodel.html

fcarney

How can clang produce errors for one kit on the project, but not produce errors for the same project on another kit? Same exact code. Same exact clang settings. This sounds like to me some temporary file is not getting cleared.

kshegunov

Dunno. It shouldn't, but I don't use it because it is fat.

fcarney

I am gonna say this is solved. I am tired of wasting time on this. Thanks for your help everyone.
If I figure this out later I will post something here. I am going to be reevaluating my arm compiler installation later. Maybe that will find something.