* decl.c (build_enumerator): Do not issue duplicate error messages

	* decl.c (build_enumerator): Do not issue duplicate error messages
	about invalid enumeration constants.
	* parser.c (cp_parser_non_integral_constant_expression): Always
	set parser->non_integral_constant_expression_p.
	(cp_parser_primary_expression): Add cast_p parameter.  Issue
	errors about invalid uses of floating-point literals in
	cast-expressions.
	(cp_parser_postfix_expression): Add cast_p parameter.
	(cp_parser_open_square_expression): Pass it.
	(cp_parser_parenthesized_expression_list): Add cast_p parameter.
	(cp_parser_unary_expression): Likewise.
	(cp_parser_new_placement): Pass it.
	(cp_parser_direct_new_declarator): Likewise.
	(cp_parser_new_initializer): Likewise.
	(cp_parser_cast_expression): Add cast_p parameter.
	(cp_parser_binary_expression): Likewise.
	(cp_parser_question_colon_clause): Likewise.
	(cp_parser_assignment_expression): Likewise.
	(cp_parser_expression): Likewise.
	(cp_parser_constant_expression): If an integral constant
	expression is invalid, return error_mark_node.
	(cp_parser_expression_statement): Pass cast_p.
	(cp_parser_condition): Likewise.
	(cp_parser_iteration_statement): Likewise.
	(cp_parser_jump_statement): Likewise.
	(cp_parser_mem_initializer): Likewise.
	(cp_parser_template_argument): Likewise.
	(cp_parser_parameter_declaration): Likewise.
	(cp_parser_initializer): Likewise.
	(cp_parser_throw_expression): Likewise.
	(cp_parser_attribute_list): Likewise.
	(cp_parser_simple_cast_expression): Likewise.
	(cp_parser_functional_cast): Likewise.
	(cp_parser_late_parsing_default_args): Likewise.
	(cp_parser_sizeof_operand): Save/restore
	non_integral_constant_expression_p.

	* include/std/std_limits.h (numeric_limits<float>::has_denorm):
	Add required cast.
	(numeric_limits<double>::has_denorm): Likewise.
	(numeric_limits<long double>::has_denorm): Likewise.

	* g++.dg/other/warning1.C: Adjust error messags.
	* g++.dg/parse/constant5.C: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@94512 138bc75d-0d04-0410-961f-82ee72b054a4