[Bug 49173] New: widl generates invalid code for Gecko's ISimpleDOM.idl

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49173

            Bug ID: 49173
           Summary: widl generates invalid code for Gecko's ISimpleDOM.idl
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rpc
          Assignee: wine-bugs at winehq.org
          Reporter: emilio at crisal.io
      Distribution: ---

Compiling the following IDL file t.idl:

import "objidl.idl";                                                            
import "oaidl.idl";                                                             

[object, uuid(1814ceeb-49e2-407f-af99-fa755a7d2607)]                            
interface ISimpleDOMNode : IUnknown                                             
{                                                                               
  [propget, local] HRESULT localInterface([out][retval] void **localInterface); 
  [propget, call_as(get_localInterface)]                                        
  HRESULT remoteLocalInterface([out][retval] IUnknown **localInterface);        
}

With:

$ ./tools/widl/widl -m 64 --win64 -robust -Oicf t.idl -I include

Generates the following bit:

      struct _PARAM_STRUCT                                                      
      {                                                                         
          ISimpleDOMNode *This;                                                 
          IUnknown **localInterface;                                            
          HRESULT _RetVal DECLSPEC_ALIGN(8);                                    
      } *pParamStruct = (struct _PARAM_STRUCT *)pStubMsg->StackTop;

Which fails to compile like:

 3:11.30 ISimpleDOM_p.c(65,24): error: expected ';' at end of declaration list
 3:11.30         HRESULT _RetVal DECLSPEC_ALIGN(8);

Moving the DECLSPEC_ALIGN code before _RetVal fixes it.

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