[Qt-creator] QtCreator 4.3/4.4 + CMake likes to "rebuild" my project, a lot.

Michael Jackson mike.jackson at bluequartz.net
Wed Sep 27 15:58:46 CEST 2017

I have seen this problem more than a few times and with a 45 minute build time for our project it is starting to get in the way. Our project is CMake based (I am using CMake 3.8 or 3.9 depending on the particular workstation that I am using at the time) and also uses Qt 5.9.1 64 bit. All the code is C++. What will happen is that I load the project, QtCreator properly configures for the build (Debug) and I build the project successfully. I quit QtCreator. Relaunch QtCreator and when I click Debug for our application QtCreator will pretty much rebuild the entire project. NOTHING changed between when I last built, quit QtCreator and relaunched QtCreator. I use ninja as the build tool.

Just to sanity check our CMake code I dropped out to a command line and went into a clean build directory, ran CMake, built, ran cmake again and built and the second build did nothing as nothing needed to be done. I can replicate this on a semi regular basis but I can't pin down what is happening inside of QtCreator that forces something to be regenerated on the CMake side. Our CMake codes do generate some header files which I think is somehow interacting with QtCreator's cmake support to somehow regenerate those files when the probably should not have been generated?

Thoughts on this is much appreciated.

Michael Jackson | Owner, President
      BlueQuartz Software
[e] mike.jackson at bluequartz.net
[w] www.bluequartz.net

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