Unfortunately still not fixed in v1.16.

The workaround ist to edit all project files (and ioc file) with text editor (replace mcu type) and regenerate the project.Or create a new empty project with CubeMX and import the settings from the old ioc file, then copy all user files and code.I ha...

Yes, there is no warning but with internal builder is the flash usage 5% bigger. 

The issue has already been reported and it should be addressed with the CubeIDE 1.16 release.

The warning still exists with STM32CubeIDE 1.15.0.The current plan is that in the next release of GNU make, this will become an error not a warning. So you should address it now. The reason for the change is that there are other errors in how GNU mak...