[Bug c++/91338] Implement P1161R3: Deprecate a[b,c]

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91338

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Aug  5 19:01:15 2019
New Revision: 274121

URL: https://gcc.gnu.org/viewcvs?rev=274121&root=gcc&view=rev
Log:
        PR c++/91338 - Implement P1161R3: Deprecate a[b,c].
        * c-opts.c (c_common_post_options): Enable -Wcomma-subscript by
        default for C++2a, unless -Wno-deprecated.
        * c.opt (Wcomma-subscript): New warning.

        * parser.c (cp_parser_postfix_open_square_expression): Warn about uses
        of a comma operator within a subscripting expression.
        (cp_parser_skip_to_closing_square_bracket_1): New function, made out
        of...
        (cp_parser_skip_to_closing_square_bracket): ...this.

        * doc/invoke.texi: Document -Wcomma-subscript.

        * g++.dg/cpp2a/comma1.C: New test.
        * g++.dg/cpp2a/comma2.C: New test.
        * g++.dg/cpp2a/comma3.C: New test.
        * g++.dg/cpp2a/comma4.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp2a/comma1.C
    trunk/gcc/testsuite/g++.dg/cpp2a/comma2.C
    trunk/gcc/testsuite/g++.dg/cpp2a/comma3.C
    trunk/gcc/testsuite/g++.dg/cpp2a/comma4.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-opts.c
    trunk/gcc/c-family/c.opt
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/parser.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog