Strange error after updating Lazarus/FPC

[MISV]

I am using this version:
- Version 2.1.0
- Date: 2020-09-13
- FPC Version: 3.3.1
- SVN Revision: 63882
- X86-64-darwin-cocoa

I am using Zexmlss for my Excel handling:
http://avemey.com/zexmlss/
https://github.com/Avemey/

Suddenly when compiling I at line:

Code: Pascal  [Select][+][-]

1. type TZXMLSSave = class; CZXMLSSaveClass = class of TZXMLSSave;
2.  
3.      { TZXMLSSave }
4.  
5.      TZXMLSSave = class (TInterfacedObject, IZXMLSSave, IZXMLSSaveImpl)
6.  

get errors:

zeSave.pas(50,19) Error: No matching implementation for interface method "_AddRef:LongInt; CDecl;" found
zeSave.pas(50,19) Error: No matching implementation for interface method "_Release:LongInt; CDecl;" found
zeSave.pas(50,19) Error: No matching implementation for interface method "_AddRef:LongInt; CDecl;" found
zeSave.pas(50,19) Error: No matching implementation for interface method "_Release:LongInt; CDecl;" found

Some kind of compiler bug or...?

[PascalDragon]

The problem is around line 127. FPC 3.2.0 and newer is stricter in checking that interface methods do indeed match correctly. The correct declaration of _AddRef and _Release is as they are declared in IInterface:

Code: Pascal  [Select][+][-]

1.          function _AddRef : longint;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
2.          function _Release : longint;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};