PR middle-end/61294
gcc/c-family/
	* c.opt (Wmemset-transposed-args): New warning.
gcc/c/
	* c-parser.c (c_parser_expr_list): Add new argument literal_zero_mask.
	If non-NULL, call c_parser_check_literal_zero.
	(c_parser_check_literal_zero): New function.
	(c_parser_postfix_expression_after_primary): Adjust
	c_parser_expr_list caller, handle -Wmemset-transposed-args.
gcc/cp/
	* cp-tree.h (LITERAL_ZERO_P): Define.
	* parser.c (cp_parser_parenthesized_expression_list): Add
	want_literal_zero_p argument, if true, for literal zeros
	insert INTEGER_CSTs with LITERAL_ZERO_P flag set.
	(cp_parser_postfix_expression): Adjust
	cp_parser_parenthesized_expression_list caller, handle
	-Wmemset-transposed-args.
	(literal_zeros): New variable.
gcc/
	* doc/invoke.texi (-Wmemset-transposed-args): Document.
gcc/testsuite/
	* c-c++-common/Wmemset-transposed-args1.c: New test.
	* c-c++-common/Wmemset-transposed-args2.c: New test.
	* g++.dg/warn/Wmemset-transposed-args-1.C: New test.

From-SVN: r212510