Index: /trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3kit.h
===================================================================
--- /trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3kit.h	(revision 66111)
+++ /trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3kit.h	(revision 66112)
@@ -36,4 +36,16 @@
 #ifndef DOXYGEN_RUNNING
 # undef  IN_RING0
+#endif
+
+/*
+ * Make asm.h and friend compatible with our 64-bit assembly config (ASM_CALL64_MSC).
+ */
+#if defined(__GNUC__) && ARCH_BITS == 64
+# undef DECLASM
+# ifdef __cplusplus
+#  define DECLASM(type)             extern "C" type BS3_CALL
+# else
+#  define DECLASM(type)             type BS3_CALL
+# endif
 #endif