re PR c++/50608 (cannot apply 'offsetof' to a non-constant address)

re PR c++/50608 (cannot apply 'offsetof' to a non-constant address)

2011-11-04  Eric Botcazou  <ebotcazou@adacore.com>

	PR c++/50608
	* c-parser.c (c_parser_postfix_expression) <RID_OFFSETOF>: Adjust call
	to fold_offsetof.
	* c-typeck.c (build_unary_op) <ADDR_EXPR>: Call fold_offsetof_1.
c-family/
	* c-common.c (c_fully_fold_internal) <ADDR_EXPR>: Call fold_offsetof_1.
	(fold_offsetof_1): Make global.  Remove STOP_REF argument and adjust.
	<INDIRECT_REF>: Return the argument.
	<ARRAY_REF>: Remove special code for negative offset.
	Call fold_build_pointer_plus instead of size_binop.
	(fold_offsetof): Remove STOP_REF argument and adjust.
	* c-common.h (fold_offsetof_1): Declare.
	(fold_offsetof): Remove STOP_REF argument.
cp/
	* semantics.c (finish_offsetof): Adjust call to fold_offsetof.
	* typeck.c (cp_build_addr_expr_1): Call fold_offsetof_1.

From-SVN: r180986