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3373 gcc >= 4.5 concerns about offsetof()

@@ -24,19 +24,21 @@
  */
 
 #ifndef _MDBMOD_MISC_H
 #define _MDBMOD_MISC_H
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 #include <mdb/mdb_modapi.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#if defined(__GNUC__)
+#define offsetof(s, m)  __builtin_offsetof(s, m)
+#else
 #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
+#endif
 
 extern int umem_debug(uintptr_t, uint_t, int, const mdb_arg_t *);
 
 extern int umem_set_standalone(void);
 extern ssize_t umem_lookup_by_name(const char *, GElf_Sym *);