Sema+llvm: improve handling of namespace-like unions

Closes #13557

1 files changed, 2 insertions, 2 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 763dde170b..af9dcacf48 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -2137,7 +2137,8 @@ pub const Object = struct {
                     break :blk fwd_decl;
                 };
 
-                if (!ty.hasRuntimeBitsIgnoreComptime()) {
+                const union_obj = ty.cast(Type.Payload.Union).?.data;
+                if (!union_obj.haveFieldTypes() or !ty.hasRuntimeBitsIgnoreComptime()) {
                     const union_di_ty = try o.makeEmptyNamespaceDIType(owner_decl_index);
                     dib.replaceTemporary(fwd_decl, union_di_ty);
                     // The recursive call to `lowerDebugType` via `makeEmptyNamespaceDIType`
@@ -2147,7 +2148,6 @@ pub const Object = struct {
                 }
 
                 const layout = ty.unionGetLayout(target);
-                const union_obj = ty.cast(Type.Payload.Union).?.data;
 
                 if (layout.payload_size == 0) {
                     const tag_di_ty = try o.lowerDebugType(union_obj.tag_ty, .full);