From 59383f5010d5bd1cffc2423148bf84aa4ba972e9 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Wed, 24 Jun 2026 11:34:04 +0200
Subject: [PATCH] constexpr more cases to prevent gcc calling non-existing
 template overloads

---
 src/ifcparse/IfcSpfHeader.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/ifcparse/IfcSpfHeader.cpp b/src/ifcparse/IfcSpfHeader.cpp
index 95297720ef..f28c2ea2df 100644
--- a/src/ifcparse/IfcSpfHeader.cpp
+++ b/src/ifcparse/IfcSpfHeader.cpp
@@ -184,12 +184,17 @@ bool IfcSpfHeader::tryRead() {
 void IfcParse::IfcSpfHeader::assign(const IfcSpfHeader& other) {
     if (this != &other) {
         auto copy_inst = [](IfcUtil::IfcBaseEntity* new_entity, IfcUtil::IfcBaseEntity* entity, const IfcParse::entity* decl, IfcParse::impl::in_memory_file_storage* own_storage, IfcParse::impl::in_memory_file_storage* other_storage) {
+            if (!new_entity || !entity) {
+                return;
+            }
             for (size_t i = 0; i < decl->attribute_count(); ++i) {
                 entity->data().apply_visitor(other_storage, decl, entity->identity(), [i, decl, new_entity, own_storage](const auto& v) {
                     using U = std::decay_t<decltype(v)>;
                     if constexpr (std::is_same_v<U, IfcUtil::IfcBaseClass*>) {
                     } else if constexpr (std::is_same_v<U, aggregate_of_instance::ptr>) {
                     } else if constexpr (std::is_same_v<U, aggregate_of_aggregate_of_instance::ptr>) {
+                    } else if constexpr (std::is_same_v<U, empty_aggregate_t>) {
+                    } else if constexpr (std::is_same_v<U, empty_aggregate_of_aggregate_t>) {
                     } else {
                         new_entity->set_attribute_value(i, v);
                     }