[lazarus] GDK calling problems

[Peter Vreman]

> >I don't think the bug is in syslinux itself, but in a function calling a
> >syslinux function with wrong parameters, for example a move(nil,nil,1) or
> >something like that.
> 
> 	I recompiled the library with debug info (thanks for
> 	info for a newcomer,Peter) and what I found was that
> 	the real problem occurs at OBJPAS.INC, line 114
> 
> 	function TObject.ClassType : TClass;
> 
> 	 begin
> 	 ClassType:=TClass(Pointer(Self)^) <--- here
> 	 end;
> 
> 	and the information says: Program received signal
> 	SIGSEGV, segmentaion fault.
> 	0x807790 in TOBJECT_CLASSTYPE (this=Cannot access
> 	memory at addres NxN) at objpas.inc:114
> 
> 	NxN varies from 0x0 to 0x5 depending on the problematic
> 	keys pressed (Tab=0x0, other values arrow keys).
> 
> 	Hope this helps correct the problems, as a rookie I
> 	cannot yet find the problem.
Another hint:

type 'bt' in gdb to see a backtrace from which placed it's called. Because
the call to this tobject method is with the wrong 'this' the bug is in the
caller

Peter