The attached file has a base class that defines a pure virtual function, and a derived class that inherits from it. Build it without RTTI, then with RTTI.

C:\examples>cl2000 --abi=eabi --keep_asm file.cpp

C:\examples>copy file.asm nortti.asm
        1 file(s) copied.

C:\examples>cl2000 --abi=eabi --keep_asm --rtti file.cpp

C:\examples>copy file.asm rtti.asm
        1 file(s) copied.

Compare nortti.asm and rtti.asm. There are only minimal differences that are not related to the problem.

This causes the .const section to be much larger, because it contains RTTI. This RTTI includes, among other things, a string that names the class. The customer complains that this is a waste of flash memory.