[fpc-pascal] Different behaviour between FPC 2.6.4 and FPC 3.0.4

[Jonas Maebe]

On 05/05/2020 22:05, Rainer Stratmann wrote:
> Compiled with FPC 3.0.4 there is an access violation when executing procvar; 
> Compiled with FPC 2.6.4 it works for a long time.
> 
> Did I overlooked something?
> 
> Mode: MObjFPC
> 
> type
>  t_funcboolean = function : boolean;
> var
>  procvar : t_funcboolean;
> 
> function proc_bool : t_funcboolean;
> begin
> end;
> 
> begin
>  procvar := proc_bool;

This assigns the result of proc_bool to procvar. The result of proc_bool
is not initialised, so you are assigning a random address to procvar.

>  procvar; // -> access violation with FPC 3.0.4

That is expected. I don't know why it worked in FPC 2.6.4. Perhaps it
had a bug and assigned the address of proc_bool to procvar, but that is
not the documented behaviour for mode objfpc (it is for mode tp and
delphi though).


Jonas