[yxhuvud]

Often, it will be because the projects are older than the warnings. And when the amount of warnings cross a threshold, they will not be fixed.

[joosters]

Yes, definitely this. If there are hundreds of warnings, there's no motivation to fix any of them. If there are none, hopefully no-one wants to add the code that creates one.

Perhaps they now need to compile the project with warnings-as-errors to enforce clean code?