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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] [13/14 Regression] ICE with nested redefinition of
 enum
Date: Wed, 31 Jan 2024 21:40:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112571

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Joseph Myers <jsm28@gcc.gnu.org>:

https://gcc.gnu.org/g:d22d1a9346f27db41459738c6eb404f8f0956e6f

commit r14-8669-gd22d1a9346f27db41459738c6eb404f8f0956e6f
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.

            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.=