rsmith added inline comments.
================
Comment at: lib/Sema/SemaType.cpp:8022
+ else if (LangOpts.CPlusPlus && isCompleteType(Loc, T) &&
+ !T.isTriviallyCopyableType(Context))
// Some other non-trivially-copyable type (probably a C++ class)
----------------
efriedma wrote:
> If you're going to allow incomplete types in C++, you'll need some code to
> handle the case where the type is initially incomplete, but completed later.
Perhaps the trivially-copyable requirement could be deferred in all cases until
we reach an actual load or store. Constraints that are only enforced when a
type happens to be complete are generally a bad idea (we have a mess like this
for constraints on types being non-abstract, and we're still working on
unsticking ourselves from that mess in the C++ standard).
In passing, I'd also note that we need the trivially-copyable requirement even
outside C++, for structs containing `__weak` / `__strong` fields.
https://reviews.llvm.org/D46112
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