$ fpc -CO -vh overflow.pas
Hint: Start of reading config file /home/graemeg/.fpc.cfg
Hint: End of reading config file /home/graemeg/.fpc.cfg
Free Pascal Compiler version 3.0.4+dfsg-18ubuntu2 [2018/08/29] for x86_64
Copyright (c) 1993-2017 by Florian Klaempfl and others
Target OS: Linux for x86-64
Compiling overflow.pas
overflow.pas(11,7) Hint: Type size mismatch, possible loss of data / range check error
Linking overflow
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
14 lines compiled, 0.0 sec
3 hint(s) issued