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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/103365] ICE in register_scoped_attribute, at
 attribs.c:390
Date: Mon, 22 Nov 2021 21:14:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103365

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[12 Regression] ICE in      |ICE in
                   |register_scoped_attribute,  |register_scoped_attribute,
                   |at attribs.c:390            |at attribs.c:390
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|                            |2021-11-22
     Ever confirmed|0                           |1
          Component|c                           |middle-end

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
#pragma GCC diagnostic ignored_attributes "n::_a"

There is a check to make sure the attribute isn't named __a__ but the assert
only checks that the attribute starts with _.

Note you can also reproduce the ICE with the following option passed to GCC:
-Wno-attributes=3Dn::_a

Confirmed, not a regression as the warning option is new.=