I know that probably I should update eventually: my QtCreator is version 4.9.0 - and maybe the issue will go away!? However it is hard to tell immediately because it happens only sporadically, so I could not reproduce it on purpose. And right now it just happened again, so I am taking the opportunity. Anyway, I work with CMake, and my guess is that it happens only with this combination. (By the way, I am working with CMake version 3.14.0, Windows 10 64-bit, MSVC2015 and Qt 5.11.2).
For myself I call this phenomenon "the QtCreator is getting tired". Meaning: it needs a break. Typically it happens during a phase of many changes in a project setup. Like the project is complex, but not even once run through a successful build, so I have to change dependencies here, add another CMakeLists.txt there, and other such changes that may affect the whole or parts of the setup. And if I have done this a few times, and then I try another build, I only get the following message: "Configuration is faulty. Check the Issues view for details." And in the issues view I am getting this: "A CMake tool must be set up for building. Configure a CMake tool in the kit options." Ok, this is all nonsense, because I have such a tool configured for long, so it is useless to even try following this advice. But I know this for a long time already: "the QtCreator is tired and needs a break." So I simply close it. And after a few seconds I start it again. (Right, it recovers really quickly!) And after going back to my project, everything is fine again! No missing CMake configuration or whatever - which was obviously already not true in the first place. Right now I am only reporting this because it is a bit "ugly", and long ago when it first happened it really worried me indeed - and I tried to fix some configuration problems that do not exist. Now I know the thing, and I simply restart QtCreator - and everything is fine again! Best regards, Cornelis
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