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From: "de34 at live dot cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/114891] New: Unconditional use of
 std::is_pointer_interconvertible_base_of_v in <generator> makes the header
 unusable with Clang 18
Date: Tue, 30 Apr 2024 02:38:25 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 15.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114891

            Bug ID: 114891
           Summary: Unconditional use of
                    std::is_pointer_interconvertible_base_of_v in
                    <generator> makes the header unusable with Clang 18
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: de34 at live dot cn
  Target Milestone: ---

Clang only supports the intrinsic for is_pointer_interconvertible_base_of_v
since 19 (https://github.com/llvm/llvm-project/pull/88473).
It seems that the uses of is_pointer_interconvertible_base_of_v is not stri=
ctly
needed. Perhaps we should guard the uses with
__cpp_lib_is_pointer_interconvertible to support old versions of Clang.=