================
@@ -9442,9 +9442,21 @@ bool
SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
int DiagKind = -1;
- if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
- DiagKind = !Decl ? 0 : 1;
- else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
+ if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) {
+ if (CSM == Sema::CXXDefaultConstructor && Field &&
+ Field->getParent()->isUnion()) {
+ // [class.default.ctor]p2:
+ // A defaulted default constructor for class X is defined as deleted if
+ // - X is a union that has a variant member with a non-trivial default
+ // constructor and no variant member of X has a default member
+ // initializer
+ const auto *RD = cast<CXXRecordDecl>(Field->getParent());
+ if (!RD->hasInClassInitializer())
+ DiagKind = !Decl ? 0 : 1;
----------------
AaronBallman wrote:
FWIW, I ran into exactly the same issue that Erich did in noticing that both
branches do `DiagKind = !Decl ? 0 : 1;`. That two of us ran into the same
readability issue suggests that this should be modified to be more clear.
https://github.com/llvm/llvm-project/pull/82407
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