The latest GCC has a builtin for determining offsets of a field within a
structure:
GCC implements for both C and C++ a syntactic extension to implement the
offsetof macro.
primary:
"__builtin_offsetof" "(" typename "," offsetof_member_designator ")"
offsetof_member_designator:
identifier
| offsetof_member_designator "." identifier
| offsetof_member_designator "[" expr "]"
This extension is sufficient such that
#define offsetof(type, member) __builtin_offsetof (type, member)
is a suitable definition of the offsetof macro. In C++, type may be
dependent. In either case, member may consist of a single identifier, or
a sequence of member accesses and array references.
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