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diff --git a/src/VBox/Runtime/r3/win/vcc-fakes.h b/src/VBox/Runtime/r3/win/vcc-fakes.h
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+++ b/src/VBox/Runtime/r3/win/vcc-fakes.h
@@ -0,0 +1,155 @@
+/* $Id: vcc-fakes.h $ */
+/** @file
+ * IPRT - Common macros for the Visual C++ 2010+ CRT import fakes.
+ */
+
+/*
+ * Copyright (C) 2012-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r3_win_vcc_fakes_h
+#define IPRT_INCLUDED_SRC_r3_win_vcc_fakes_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#ifdef RT_STRICT
+# include <stdio.h> /* _snprintf */
+#endif
+
+
+/** @def MY_ASSERT
+ * We use a special assertion macro here to avoid dragging in IPRT bits in
+ * places which cannot handle it (direct GA 3D bits or something like that).
+ *
+ * Turns out snprintf is off limits too.  Needs Locale info and runs out of
+ * stack
+ */
+#ifdef RT_STRICT
+# if 1
+#  define MY_ASSERT(a_Expr, g_szMsg) \
+    do { \
+        if ((a_Expr)) \
+        { /*likely*/ } \
+        else \
+        { \
+            OutputDebugStringA("Assertion failed on line " RT_XSTR(__LINE__) ": " RT_XSTR(a_Expr) "\n"); \
+            OutputDebugStringA("Assertion message: " g_szMsg "\n"); \
+            RT_BREAKPOINT(); \
+        } \
+    } while (0)
+# define MY_ASSERT_STMT_RETURN(a_Expr, a_Stmt, a_rc) \
+    do { \
+        if (a_Expr) \
+        { /* likely */ } \
+        else \
+        { \
+            OutputDebugStringA("Assertion failed on line " RT_XSTR(__LINE__) ": " RT_XSTR(a_Expr) "\n"); \
+            RT_BREAKPOINT(); \
+            a_Stmt; \
+            return (a_rc); \
+        } \
+    } while (0)
+# else
+#  define MY_ASSERT(a_Expr, ...) \
+    do { \
+        if ((a_Expr)) \
+        { /*likely*/ } \
+        else \
+        { \
+            char szTmp[256]; \
+            _snprintf(szTmp, sizeof(szTmp), "Assertion failed on line %u in '%s': %s", __LINE__, __PRETTY_FUNCTION__, #a_Expr); \
+            OutputDebugStringA(szTmp); \
+            _snprintf(szTmp, sizeof(szTmp), __VA_ARGS__); \
+            OutputDebugStringA(szTmp); \
+            RT_BREAKPOINT(); \
+        } \
+    } while (0)
+# endif
+#else
+# define MY_ASSERT(a_Expr, ...) do { } while (0)
+# define MY_ASSERT_STMT_RETURN(a_Expr, a_Stmt, a_rc) \
+    do { if (a_Expr) { /* likely */ } else { a_Stmt; return (a_rc); }} while (0)
+#endif
+
+
+/** Dynamically resolves an NTDLL API we need.   */
+#define RESOLVE_NTDLL_API(ApiNm) \
+    static bool volatile    s_fInitialized##ApiNm = false; \
+    static decltype(ApiNm) *s_pfn##ApiNm = NULL; \
+    decltype(ApiNm)        *pfn##ApiNm; \
+    if (s_fInitialized##ApiNm) \
+        pfn##ApiNm = s_pfn##ApiNm; \
+    else \
+    { \
+        pfn##ApiNm = (decltype(pfn##ApiNm))GetProcAddress(GetModuleHandleW(L"ntdll"), #ApiNm); \
+        s_pfn##ApiNm = pfn##ApiNm; \
+        s_fInitialized##ApiNm = true; \
+    } do {} while (0)
+
+
+/** Declare a kernel32 API.
+ * @note We are not exporting them as that causes duplicate symbol troubles in
+ *       the OpenGL bits. */
+#define DECL_KERNEL32(a_Type) extern "C" a_Type WINAPI
+
+
+/** Ignore comments. */
+#define COMMENT(a_Text)
+
+/** Used for MAKE_IMPORT_ENTRY when declaring external g_pfnXxxx variables. */
+#define DECLARE_FUNCTION_POINTER(a_Name, a_cb) extern "C" decltype(a_Name) *RT_CONCAT(g_pfn, a_Name);
+
+/** Used in the InitFakes method to decl are uCurVersion used by assertion. */
+#ifdef RT_STRICT
+# define CURRENT_VERSION_VARIABLE() \
+    unsigned uCurVersion = GetVersion(); \
+    uCurVersion = ((uCurVersion & 0xff) << 8) | ((uCurVersion >> 8) & 0xff)
+#else
+# define CURRENT_VERSION_VARIABLE() (void)0
+#endif
+
+
+/** Used for MAKE_IMPORT_ENTRY when resolving an import. */
+#define RESOLVE_IMPORT(a_uMajorVer, a_uMinorVer, a_Name, a_cb) \
+    do { \
+        FARPROC pfnApi = GetProcAddress(hmod, #a_Name); \
+        if (pfnApi) \
+            RT_CONCAT(g_pfn, a_Name) = (decltype(a_Name) *)pfnApi; \
+        else \
+        { \
+            MY_ASSERT(uCurVersion < (((a_uMajorVer) << 8) | (a_uMinorVer)), #a_Name); \
+            RT_CONCAT(g_pfn, a_Name) = RT_CONCAT(Fake_,a_Name); \
+        } \
+    } while (0);
+
+
+#endif /* !IPRT_INCLUDED_SRC_r3_win_vcc_fakes_h */
+