Re: [fpc-pascal] Corba ABI change ?

[Adriaan van Os via fpc-pascal]

Tony Whyman via fpc-pascal wrote:


Supplementing my point below, I went back and checked my notes. The 
TObject layout post 3.2 (in my copy of trunk) is now

       TObject = class
       {$IFDEF SYSTEM_HAS_FEATURE_MONITOR}
       strict private
          _MonitorData : Pointer;
       private
          function SetMonitorData(aData,aCheckOld : Pointer) : Pointer; 
inline;
          function GetMonitorData: Pointer; inline;
       {$ENDIF}
       protected
          function GetDisposed : Boolean; inline;
          Property Disposed : Boolean Read GetDisposed;
       public

with everything before "public" having been added. The big change is the 
addition of "_MonitorData". This bumps the offset of all later fields up 
by sizeof(pointer). If you have code that makes assumptions about the 
object layout - and this very much applies to code that tries to import 
an object from C++ then your previous assumptions are invalid.

Is SYSTEM_HAS_FEATURE_MONITOR defined by default in the build process ? I assume, the compiler can 
be built without it ?

Regards,

Adriaan van Os

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