gcc/
	* c-typeck.c (readonly_error): Delete.

gcc/c-family/
	* c-common.h (readonly_error): Declare.
	* c-common.c (readonly_error): Define.

gcc/cp/
	* cp-tree.h (readonly_error_kind): Delete.
	(readonly_error): Rename to...
	(cxx_readonly_error): ...this.  Change second argument to be an
	enum lvalue_use.
	* semantics.c (finish_asm_stmt): Call cxx_readonly_error.
	* typeck.c (cp_build_unary_op): Likewise.
	(cp_build_modify_expr): Likewise.
	* typeck2.c (readonly_error): Rename to...
	(cxx_readonly_error): ...this.  Delegate to readonly_error for
	most cases.

gcc/testsuite/
	* gcc.dg/dfp/struct-union.c: Adjust.
	* gcc.dg/lvalue-2.c: Adjust.
	* gcc.dg/pr21419.c: Adjust.
	* gcc.dg/qual-component-1.c: Adjust.
	* g++.dg/other/const1.C: Adjust.

From-SVN: r167687