[Bug c++/105300] [10/11/12/13 Regression] segfault from static_assert with user-defined string suffix argument

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105300

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:9f353b0c1dc9385ba8b8a64b65d66d5452383c11

commit r13-5390-g9f353b0c1dc9385ba8b8a64b65d66d5452383c11
Author: Marek Polacek <polacek@redhat.com>
Date:   Fri Nov 11 17:59:30 2022 -0500

    c++: Reject UDLs in certain contexts [PR105300]

    In this PR, we are crashing because we've encountered a UDL where a
    string-literal is expected.  This patch makes the parser reject string
    and character UDLs in all places where the grammar requires a
    string-literal and not a user-defined-string-literal.

    I've introduced two new wrappers; the existing cp_parser_string_literal
    was renamed to cp_parser_string_literal_common and should not be called
    directly.  finish_userdef_string_literal is renamed from
    cp_parser_userdef_string_literal.

            PR c++/105300

    gcc/c-family/ChangeLog:

            * c-pragma.cc (handle_pragma_message): Warn for CPP_STRING_USERDEF.

    gcc/cp/ChangeLog:

            * parser.cc: Remove unnecessary forward declarations.
            (cp_parser_string_literal): New wrapper.
            (cp_parser_string_literal_common): Renamed from
            cp_parser_string_literal.  Add a bool parameter.  Give an error
when
            UDLs are not permitted.
            (cp_parser_userdef_string_literal): New wrapper.
            (finish_userdef_string_literal): Renamed from
            cp_parser_userdef_string_literal.
            (cp_parser_primary_expression): Call
cp_parser_userdef_string_literal
            instead of cp_parser_string_literal.
            (cp_parser_linkage_specification): Move a variable declaration
closer
            to its first use.
            (cp_parser_static_assert): Likewise.
            (cp_parser_operator): Call cp_parser_userdef_string_literal instead
of
            cp_parser_string_literal.
            (cp_parser_asm_definition): Move a variable declaration closer to
its
            first use.
            (cp_parser_asm_specification_opt): Move variable declarations
closer to
            their first use.
            (cp_parser_asm_operand_list): Likewise.
            (cp_parser_asm_clobber_list): Likewise.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/udlit-error1.C: New test.