The issue in CLion software when a file does not belong to any project target; code insight features might not work properly.
The issue described in option a) is an issue in the CLion software. When a file does not belong to any project target, it can lead to problems with the code insight features in CLion. This means that the code suggestions, error highlighting, and other code assistance features may not work properly.
This issue can occur when a file is not included in any of the project targets defined in CLion. To resolve this issue, you need to make sure that the file is included in a project target. This can be done by adding the file to a specific target or by configuring CLion to treat the file as part of the project.