--- a/kernel/eka/include/e32def.h	Fri Jun 11 16:28:18 2010 +0100
+++ b/kernel/eka/include/e32def.h	Fri Jun 11 17:54:34 2010 +0100
@@ -443,8 +443,9 @@
 @see TDblQue
 */
 #ifndef _FOFF
+#define _FOFF_DYNAMIC(c,f)	(((TInt)&(((c *)0x1000)->f))-0x1000)		// can be a runtime calculation if f is not sufficiently constant
 #if __GNUC__ < 4
-#define _FOFF(c,f)			(((TInt)&(((c *)0x1000)->f))-0x1000)
+#define _FOFF(c,f)			_FOFF_DYNAMIC(c,f)
 #else
 #define _FOFF(c,f)			(__builtin_offsetof(c,f))
 #endif