Enable static analyzer

1. Install the latest version of clang-tidy

   For older versions of Ubuntu

   If you are using older version of Ubuntu (e.g. via Krita Docker build environment) make sure that you added the backports repository:

   sudo add-apt-repository ppa:savoury1/llvm-defaults-11
   sudo apt-get update
   

   sudo apt install clang-11 clang-format-11 clang-tidy-11 clang-tools-11
   

2. Go to the Analyser settings in QtCreator (Options->Analyser)

3. In the field for Clang-Tidy executable select the script from Krita source tree sdk/clang-tidy-arguments-wrapper.sh. This script removes GCC-specific compile options not supported by clang. Without the wrapper script the analyser tool will fail.

4. Open «Diagnostic Configuration» dialog. Duplicate the default configuration, switch to «Clang-Tidy Checks» tab and choose «Use .clang-tidy config file»

5. In the «Project Settings» pane make sure that your new Diagnostic Configuration is activated.

6. Start analysing by clicking on Analyze->Clang Tidy and Clazy…