================
@@ -3244,6 +3244,17 @@ static bool canUseCtorHoming(const CXXRecordDecl *RD) {
RD->hasConstexprNonCopyMoveConstructor())
return false;
+ // Skip this optimization if this type is standard-layout and is a member of
+ // some standard-layout union in this translation unit. Per the C++ spec, "it
----------------
dwblaikie wrote:
I /believe/ that's not the case - I think Clang does incremental lowering
(lowering functions to LLVM IR as they are parsed, rather than in a batch at
the end). For insntance, try debugging clang as it compiles this program with
debug info enabled:
```
struct t1 { };
void f1(t1) {
}
void f2() {
return 1;
}
```
Break in canUseCtorHoming, and note that the breakpoint is recached before the
diagnostic is hit for the mismatched return in f2.
Not sure what concerns @efriedma-quic has with this situation, but if he's got
a moment to expand on it - should be considered.
https://github.com/llvm/llvm-project/pull/221615
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