PR middle-end/13448
	* c-tree.h (readonly_warning): Rename to ...
	(readonly_error): ... this.
	* c-typeck.c (build_unary_op): Adjust accordingly.
	(readonly_warning): Rename to ...
	(readonly_error): ... this and issue errors, not warnings.
	(build_modify_expr): Call readonly_error, not readonly_warning.
	(c_expand_asm_operands): Likewise.
	* tree-inline.c (optimize_inline_calls): Do not inline functions
	after errors have occurred.

	PR middle-end/13448
	* gcc.dg/inline-5.c: New test.
	* gcc.dg/always-inline.c: Split out tests into ...
	* gcc.dg/always-inline2.c: ... this and ...
	* gcc.dg/always-inline3.c: ... this.

From-SVN: r78682