FastMM4 + Delphi – Recompiling application with 10.2.1 causes memory leaks?

This is why you should always test your Delphi apps with FastMM4 and FullDebugMode enabled: [WayBack] Delphi – Recompiling application with 10.2.1 causes memory leaks?

A workaround is to add the below code in either of these places:

• end of your .dpr file right before the end.
• in the finalization section of a new unit

CheckSynchronize();

It calls the [WayBack] System.Classes.CheckSynchronize method to ensure the background thread performs the needed cleanup.

Thanks Stefan Glienke for solving this.

–jeroen