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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/112571] [13 Regression] ICE with nested redefinition of enum
Date: Mon, 25 Mar 2024 22:51:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112571

--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Joseph Myers
<jsm28@gcc.gnu.org>:

https://gcc.gnu.org/g:f2af129b68bc6b20f79a9a44b28c96650baa702c

commit r13-8495-gf2af129b68bc6b20f79a9a44b28c96650baa702c
Author: Joseph Myers <josmyers@redhat.com>
Date:   Wed Jan 31 21:39:53 2024 +0000

    c: Fix ICE for nested enum redefinitions with/without fixed underlying =
type
[PR112571]

    Bug 112571 reports an ICE-on-invalid for cases where an enum is
    defined, without a fixed underlying type, inside the enum type
    specifier for a definition of that same enum with a fixed underlying
    type.

    The ultimate cause is attempting to access ENUM_UNDERLYING_TYPE in a
    case where it is NULL.  Avoid this by clearing
    ENUM_FIXED_UNDERLYING_TYPE_P in thie case of inconsistent definitions.

    Bootstrapped wth no regressions for x86_64-pc-linux-gnu.

    (Note: for this GCC 13 branch backport, the tests were changed to use
    -std=3Dc2x not -std=3Dc23, and c23-enum-9.c was changed to expect
    different diagnostics because GCC 13 branch doesn't have the C23 tag
    compatibility support for redefinitions of tagged types and
    enumerators.)

            PR c/112571

    gcc/c/
            * c-decl.cc (start_enum): Clear ENUM_FIXED_UNDERLYING_TYPE_P wh=
en
            defining without a fixed underlying type an enumeration previou=
sly
            declared with a fixed underlying type.

    gcc/testsuite/
            * gcc.dg/c23-enum-9.c, gcc.dg/c23-enum-10.c: New tests.

    (cherry picked from commit d22d1a9346f27db41459738c6eb404f8f0956e6f)=