Implement C++20 P1301 [[nodiscard("should have a reason")]].

[thirdparty/gcc.git] / gcc / cp / ChangeLog

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+2019-10-17  JeanHeyd Meneide  <phdofthehouse@gmail.com>
+
+       Implement p1301 [[nodiscard("should have a reason")]] + p1771 DR
+       * tree.c (handle_nodiscard_attribute): Handle C++2a nodiscard
+       string message.
+       (std_attribute_table) Increase nodiscard argument handling
+       max_length from 0 to 1.
+       * parser.c (cp_parser_check_std_attribute): Add requirement
+       that nodiscard only be seen once in attribute-list.
+       (cp_parser_std_attribute): Check that empty parenthesis lists are
+       not specified for attributes that have max_length > 0 (e.g.
+       [[attr()]]).
+       * cvt.c (maybe_warn_nodiscard): Add nodiscard message to
+       output, if applicable.
+       (convert_to_void): Allow constructors to be nodiscard-able (P1771).
+
 2019-10-18  Nathan Sidwell  <nathan@acm.org>
 
        * cp-tree.h (struct lang_type): Remove was_anonymous.