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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/96077] GCC accepts ill-legal local enum definition
Date: Mon, 13 Jul 2020 15:16:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96077

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:4fd124a23664c712f1bb1a7e91fa23fe83d72c0b

commit r11-2064-g4fd124a23664c712f1bb1a7e91fa23fe83d72c0b
Author: Marek Polacek <polacek@redhat.com>
Date:   Thu Jul 9 20:44:05 2020 -0400

    c++: Fix tentative parsing of enum-specifier [PR96077]

    Here's an interesting issue: in this code a ) is missing:

      enum { E =3D (2 } e;

    but we compile the code anyway, and E is set to 0 in build_enumerator,
    which is sneaky.

    The problem is that cp_parser_enum_specifier parses tentatively, because
    when we see the enum keyword, we don't know yet if we'll find an
    enum-specifier, opaque-enum-declaration, or elaborated-enum-specifier.

    In this test when we call cp_parser_enumerator_list we're still parsing
    tentatively, and as a consequence, parens.require_close (parser) in
    cp_parser_primary_expression doesn't report any errors.  But we only go
    on to parse the enumerator-list after we've seen a {, at which point we
    might as well commit -- we know we're dealing with an enum-specifier.

    gcc/cp/ChangeLog:

            PR c++/96077
            * parser.c (cp_parser_enum_specifier): Commit to tentative parse
            after we've seen an opening brace.

    gcc/testsuite/ChangeLog:

            PR c++/96077
            * g++.dg/parse/enum14.C: New test.=