* Makefile.in (C_COMMON_OBJS): Add c-family/c-warn.o.

	* c-common.c (fold_for_warn): No longer static.
	(bool_promoted_to_int_p): Likewise.
	(c_common_get_narrower): Likewise.
	(constant_expression_warning): Move to c-warn.c.
	(constant_expression_error): Likewise.
	(overflow_warning): Likewise.
	(warn_logical_operator): Likewise.
	(find_array_ref_with_const_idx_r): Likewise.
	(warn_tautological_cmp): Likewise.
	(expr_has_boolean_operands_p): Likewise.
	(warn_logical_not_parentheses): Likewise.
	(warn_if_unused_value): Likewise.
	(strict_aliasing_warning): Likewise.
	(sizeof_pointer_memaccess_warning): Likewise.
	(check_main_parameter_types): Likewise.
	(conversion_warning): Likewise.
	(warnings_for_convert_and_check): Likewise.
	(match_case_to_enum_1): Likewise.
	(match_case_to_enum): Likewise.
	(c_do_switch_warnings): Likewise.
	(warn_for_omitted_condop): Likewise.
	(readonly_error): Likewise.
	(lvalue_error): Likewise.
	(invalid_indirection_error): Likewise.
	(warn_array_subscript_with_type_char): Likewise.
	(warn_about_parentheses): Likewise.
	(warn_for_unused_label): Likewise.
	(warn_for_div_by_zero): Likewise.
	(warn_for_memset): Likewise.
	(warn_for_sign_compare): Likewise.
	(do_warn_double_promotion): Likewise.
	(do_warn_unused_parameter): Likewise.
	(record_locally_defined_typedef): Likewise.
	(maybe_record_typedef_use): Likewise.
	(maybe_warn_unused_local_typedefs): Likewise.
	(maybe_warn_bool_compare): Likewise.
	(maybe_warn_shift_overflow): Likewise.
	(warn_duplicated_cond_add_or_warn): Likewise.
	(diagnose_mismatched_attributes): Likewise.
	* c-common.h: Move the declarations from c-warn.c to its own section.
	* c-warn.c: New file.

From-SVN: r240963