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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106656] [C++23] P2513 - char8_t Compatibility and
 Portability Fixes
Date: Mon, 26 Sep 2022 17:34:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106656

--- Comment #1 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:567329fdd9d65a1e6254206fefff89fa151ba7f3

commit r13-2881-g567329fdd9d65a1e6254206fefff89fa151ba7f3
Author: Marek Polacek <polacek@redhat.com>
Date:   Fri Sep 23 18:06:34 2022 -0400

    c++: P2513R4, char8_t Compatibility and Portability Fix [PR106656]

    P0482R6, which added char8_t, didn't allow

      const char arr[] =3D u8"howdy";

    because it said "Declarations of arrays of char may currently be
initialized
    with UTF-8 string literals. Under this proposal, such initializations w=
ould
    become ill-formed."  This caused too many issues, so P2513R4 alleviates
some
    of those compatibility problems.  In particular, "Arrays of char or
unsigned
    char may now be initialized with a UTF-8 string literal."  This restric=
tion
    has been lifted for initialization only, not implicit conversions.  Als=
o,
    my reading is that 'signed char' was excluded from the allowable
conversions.

    This is supposed to be treated as a DR in C++20.

            PR c++/106656

    gcc/c-family/ChangeLog:

            * c-cppbuiltin.cc (c_cpp_builtins): Update value of __cpp_char8=
_t
            for C++20.

    gcc/cp/ChangeLog:

            * typeck2.cc (array_string_literal_compatible_p): Allow
            initializing arrays of char or unsigned char by a UTF-8 string
literal.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp23/feat-cxx2b.C: Adjust.
            * g++.dg/cpp2a/feat-cxx2a.C: Likewise.
            * g++.dg/ext/char8_t-feature-test-macro-2.C: Likewise.
            * g++.dg/ext/char8_t-init-2.C: Likewise.
            * g++.dg/cpp2a/char8_t3.C: New test.
            * g++.dg/cpp2a/char8_t4.C: New test.=