Please try the attached patch. This is only a draft and contains some bad formatting.
-- Best regards, LIU Hao
From a3c58b63fe49883797ed2a505e82d85455f28913 Mon Sep 17 00:00:00 2001
From: LIU Hao <lh_mo...@126.com>
Date: Wed, 17 Aug 2022 09:23:16 +0800
Subject: [PATCH] make `_COM_SMARTPTR_TYPEDEF` work inside a class
---
mingw-w64-headers/include/comdef.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mingw-w64-headers/include/comdef.h b/mingw-w64-headers/include/comdef.h
index cb785f8f6..aae8470d7 100644
--- a/mingw-w64-headers/include/comdef.h
+++ b/mingw-w64-headers/include/comdef.h
@@ -197,7 +197,9 @@ typedef int __missing_type__;
#if defined(_COM_SMARTPTR_LEVEL2)
#ifdef __CRT_UUID_DECL
/* With our __uuidof, its result can't be passed directly as a template argument. We have _com_IIID_getter to work around that. */
-#define _COM_SMARTPTR_TYPEDEF(Interface,aIID) inline const IID &__##Interface##_IID_getter(void) { return aIID; } typedef _COM_SMARTPTR< _com_IIID_getter<Interface, __##Interface##_IID_getter > > Interface ## Ptr
+#define _COM_SMARTPTR_TYPEDEF(Interface,aIID) \
+struct __##Interface##_IID_getter_type { static const IID& __get_IID() throw() { return aIID; } }; \
+typedef _COM_SMARTPTR< _com_IIID_getter<Interface, __##Interface##_IID_getter_type::__get_IID > > Interface ## Ptr
#else
#define _COM_SMARTPTR_TYPEDEF(Interface,IID) typedef _COM_SMARTPTR< _COM_SMARTPTR_LEVEL2<Interface, &IID > > Interface ## Ptr
#endif
--
2.25.1
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