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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/114007] gcc chokes on
 __has_cpp_attribute(clang::unsafe_buffer_usage)
Date: Tue, 20 Feb 2024 12:04:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114007

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2024-02-20
     Ever confirmed|0                           |1

--- Comment #12 from Iain Sandoe <iains at gcc dot gnu.org> ---
further the manual says:

"The special operator __has_cpp_attribute (operand) may be used in =E2=80=
=98#if=E2=80=99 and
=E2=80=98#elif=E2=80=99 expressions in C++ code to test whether the attribu=
te referenced by its
operand is recognized by GCC"

Which seems to be explicit about the use in C++ code (which makes me suspect
that the availability in C mode might be unintentional).

Currently it seems that libcpp makes __has_cpp_attribute an alias for
__has_attribute, whereas __has_c_attribute is considered separate in the
enumerations.=