================
@@ -5637,6 +5638,38 @@ static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait
UTT,
return false;
case UTT_IsTriviallyEqualityComparable:
return isTriviallyEqualityComparableType(Self, T, KeyLoc);
+ case UTT_IsImplicitLifetime: {
+ DiagnoseVLAInCXXTypeTrait(Self, TInfo,
+ tok::kw___builtin_is_implicit_lifetime);
+
+ // [basic.types.general] p9
+ // Scalar types, implicit-lifetime class types ([class.prop]),
+ // array types, and cv-qualified versions of these types
+ // are collectively called implicit-lifetime types.
+ QualType UnqualT = T->getCanonicalTypeUnqualified();
----------------
Endilll wrote:
After an offline discussion, I believe we agreed on not doing anything special
for `_Atomic` for the lack of better alternatives. This can result in
discrepancies between `__builtin_is_implicit_lifetime(std::atomic<T>)` (that
might yield `true` depending on `std::atomic` implementation) and
`__builtin_is_implicit_lifetime(_Atomic T)` (which is always `false`), but
that's not new (https://godbolt.org/z/7e7954b8c).
https://github.com/llvm/llvm-project/pull/101807
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