3373 gcc >= 4.5 concerns about offsetof()

@@ -45,11 +45,15 @@
 #ifndef TEXT_DOMAIN
 #define TEXT_DOMAIN     "SYS_TEST"
 #endif
 
 /* calculate offset of a particular element in a structure      */
+#if defined(__GNUC__)
+#define offsetof(s, m)  __builtin_offsetof(s, m)
+#else
 #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
+#endif
 #define addrof(s)  ((char **)&(s))
 
 /* verify if a field is printable in respect of the current option flags */
 #define PRINTABLE(i)    ((lf->plf_ffs[(i)].pff_prt & D_FIELD) || \
         (lf->plf_ffs[(i)].pff_prt & X_FIELD))