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Commit cce372e

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richardlauMoLow
richardlau
authored and
MoLow
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deps: V8: cherry-pick c5ab3e4f0c5a
Original commit message: libstdc++: fix incomplete type in v8::internal::is_subtype<T, U> Using std::convertible with incomplete types is UB. However, till GCC 12 it was accepted and std::convertible returned false. This fails now for e.g. v8::internal::WasmArray. Use std::disjunction and std::conjunction instead which are short- circuiting, because std::is_base_of<T, T> is already true. Bug: chromium:957519 Change-Id: Ia26643dbdf0fb00d5586c71ae6b18e8d0f3cf96e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4394663 Commit-Queue: Stephan Hartmann <stha09@googlemail.com> Reviewed-by: Clemens Backes <clemensb@chromium.org> Cr-Commit-Position: refs/heads/main@{#86904} Refs: v8/v8@c5ab3e4 PR-URL: #47736 Fixes: #47623 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
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‎deps/v8/src/codegen/tnode.h‎

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+3-2Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -266,8 +266,9 @@ using BuiltinPtr = Smi;
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template <class T, class U>
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struct is_subtype {
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static const bool value =
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std::is_base_of<U, T>::value || (std::is_same<U, MaybeObject>::value &&
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std::is_convertible<T, Object>::value);
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std::disjunction<std::is_base_of<U, T>,
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std::conjunction<std::is_same<U, MaybeObject>,
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std::is_convertible<T, Object>>>::value;
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};
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template <class T1, class T2, class U>
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struct is_subtype<UnionT<T1, T2>, U> {

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