[all-commits] [llvm/llvm-project] 988fd9: [clang] Implement `__builtin_is_virtual_base_of()`...

[Vlad Serebrennikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 988fd956e776bad8057a8b7ee051a524308c097b
      https://github.com/llvm/llvm-project/commit/988fd956e776bad8057a8b7ee051a524308c097b
  Author: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
  Date:   2024-07-26 (Fri, 26 Jul 2024)

  Changed paths:
    M clang/docs/LanguageExtensions.rst
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/TokenKinds.def
    M clang/lib/Sema/SemaExprCXX.cpp
    M clang/test/SemaCXX/type-traits.cpp

  Log Message:
  -----------
  [clang] Implement `__builtin_is_virtual_base_of()` intrinsic (#100393)

This patch adds compiler support for
[P2985R0](https://wg21.link/p2985r0) "A type trait for detecting virtual
base classes".
Like we recently did with `__is_layout_compatible()` and
`__is_pointer_interconvertible_base_of()`, we support it only in C++
mode, and reject VLAs.

Resolves #98310.



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