3373 gcc >= 4.5 concerns about offsetof()

*** 25,36 ****
   */
  
  #ifndef _SYS_ECPPVAR_H
  #define _SYS_ECPPVAR_H
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <sys/note.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
--- 25,34 ----
*** 511,521 ****
--- 509,523 ----
  
  /*
   * Other useful macros
   */
  #define NELEM(a)        (sizeof (a) / sizeof (*(a)))
+ #if defined(__GNUC__)
+ #define offsetof(s, m)  __builtin_offsetof(s, m)
+ #else
  #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
+ #endif
  
  #ifdef  __cplusplus
  }
  #endif