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[upstream_utils] Fix LLVM's AlignedCharArrayUnion for C++23 (#6830)

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C++23 deprecated std::aligned_union_t.
This commit is contained in:
Tyler Veness
2024-07-15 14:50:19 -07:00
committed by GitHub
parent 5825bf46d8
commit 912d9b2201
39 changed files with 81 additions and 45 deletions
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14
wpiutil/src/main/native/thirdparty/llvm/include/wpi/AlignOf.h vendored
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@@ -13,20 +13,16 @@
#ifndef WPIUTIL_WPI_ALIGNOF_H
#define WPIUTIL_WPI_ALIGNOF_H
#include <type_traits>
#include <algorithm>
#include <cstddef>
namespace wpi {
/// A suitably aligned and sized character array member which can hold elements
/// of any type.
///
/// This template is equivalent to std::aligned_union_t<1, ...>, but we cannot
/// use it due to a bug in the MSVC x86 compiler:
/// https://github.com/microsoft/STL/issues/1533
/// Using `alignas` here works around the bug.
template <typename T, typename... Ts> struct AlignedCharArrayUnion {
using AlignedUnion = std::aligned_union_t<1, T, Ts...>;
alignas(alignof(AlignedUnion)) char buffer[sizeof(AlignedUnion)];
template <typename... Ts> struct AlignedCharArrayUnion {
alignas((std::max)({alignof(Ts)...}))
std::byte buffer[(std::max)({static_cast<size_t>(1), sizeof(Ts)...})];
};
} // end namespace wpi