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From: Griffiths Antony  W711 <antony DOT griffiths AT siemens DOT com>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: Can anybody help?
Date: Tue, 4 Dec 2001 13:57:42 +0100 
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I've the following problem:
An application, which I'm developing (C++) under cygwin requires the
header-file <w32api/ole2.h>.
During compilation, "gcc" outputs the following error-massages and warnings:
	'com-interface' only supported with -fvtable-thunks.
	Warning: 'com-interface' attribute directive ignored.
These messages occur for most of the header-files included by
<w32api/ole2.h> and the compilation exits with error.
An example of the offending code:
	header-file unknwn.h: 23 (andf before)
		DECLARE_INTERFACE(IUnknown)
		{
			STDMETHOD(QueryInterface)(THIS_ REFIID, PVOID *)
PURE;
			STDMETHOD(ULONG, AddReff)(THIS) PURE;
			STDMETHOD(ULONG, Release)(THIS) PURE;
		};
	-> I'm not sure what -fvtable-thunks means.
	    At any rate I can't find an option for gcc (version: 2.95.3-5)
with this name.
I would be most appreciative, if anybody could help me with this problem?
all the best
Tony Griffiths.

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