[fpc-pascal] Language constructs and types that dependent upon system unit

[gabor]

Hello!
I would like to write some code that will be static linked with C 
application. In addition, I would like to avoid linking system and rtl 
units and would use only routines that come with C app and library (I 
heard that combining fpc rtl with C application is not a good idea and 
there are problems with initialization/finalization sections).
I know that some of language constructs and types require additional 
code (such as memory management, etc.), which I would avoid.
I know that following types require extra code:
object, class, sting, dynamic array, try..except.
What else should I avoid?

Regards,
Michał.