analyzer: Restore g++ 4.8 bootstrap; use std::move to return std::unique_ptr.

This patch restores bootstrap when using g++ 4.8 as a host compiler.
Returning a std::unique_ptr requires a std::move on C++ compilers
(pre-C++17) that don't guarantee copy elision/return value optimization.

2024-06-08  Roger Sayle  <roger@nextmovesoftware.com>

gcc/analyzer/ChangeLog
	* constraint-manager.cc (equiv_class::make_dump_widget): Use
	std::move to return a std::unique_ptr.
	(bounded_ranges_constraint::make_dump_widget): Likewise.
	(constraint_manager::make_dump_widget): Likewise.
	* program-state.cc (sm_state_map::make_dump_widget): Likewise.
	(program_state::make_dump_widget): Likewise.
	* region-model.cc (region_to_value_map::make_dump_widget): Likewise.
	(region_model::make_dump_widget): Likewise.
	* region.cc (region::make_dump_widget): Likewise.
	* store.cc (binding_cluster::make_dump_widget): Likewise.
	(store::make_dump_widget): Likewise.
	* svalue.cc (svalue::make_dump_widget): Likewise.

6 files changed, 11 insertions, 11 deletions

diff --git a/gcc/analyzer/constraint-manager.cc b/gcc/analyzer/constraint-manager.cc
index 707385d..883f33b 100644
--- a/gcc/analyzer/constraint-manager.cc
+++ b/gcc/analyzer/constraint-manager.cc
@@ -1176,7 +1176,7 @@ equiv_class::make_dump_widget (const text_art::dump_widget_info &dwi,
       ec_widget->add_child (tree_widget::make (dwi, &pp));
     }
 
-  return ec_widget;
+  return std::move (ec_widget);
 }
 
 /* Generate a hash value for this equiv_class.
@@ -1500,7 +1500,7 @@ make_dump_widget (const text_art::dump_widget_info &dwi) const
     (tree_widget::from_fmt (dwi, nullptr,
 			    "ec%i bounded ranges", m_ec_id.as_int ()));
   m_ranges->add_to_dump_widget (*brc_widget.get (), dwi);
-  return brc_widget;
+  return std::move (brc_widget);
 }
 
 bool
@@ -1853,7 +1853,7 @@ constraint_manager::make_dump_widget (const text_art::dump_widget_info &dwi) con
   if (cm_widget->get_num_children () == 0)
     return nullptr;
 
-  return cm_widget;
+  return std::move (cm_widget);
 }
 
 /* Attempt to add the constraint LHS OP RHS to this constraint_manager.
diff --git a/gcc/analyzer/program-state.cc b/gcc/analyzer/program-state.cc
index dc2d4bd..efaf569 100644
--- a/gcc/analyzer/program-state.cc
+++ b/gcc/analyzer/program-state.cc
@@ -382,7 +382,7 @@ sm_state_map::make_dump_widget (const text_art::dump_widget_info &dwi,
       state_widget->add_child (tree_widget::make (dwi, pp));
     }
 
-  return state_widget;
+  return std::move (state_widget);
 }
 
 /* Return true if no states have been set within this map
@@ -1247,7 +1247,7 @@ program_state::make_dump_widget (const text_art::dump_widget_info &dwi) const
 	state_widget->add_child (smap->make_dump_widget (dwi, m_region_model));
   }
 
-  return state_widget;
+  return std::move (state_widget);
 }
 
 /* Update this program_state to reflect a top-level call to FUN.
diff --git a/gcc/analyzer/region-model.cc b/gcc/analyzer/region-model.cc
index a25181f..1a44ff0 100644
--- a/gcc/analyzer/region-model.cc
+++ b/gcc/analyzer/region-model.cc
@@ -288,7 +288,7 @@ make_dump_widget (const text_art::dump_widget_info &dwi) const
       sval->dump_to_pp (pp, true);
       w->add_child (text_art::tree_widget::make (dwi, pp));
     }
-  return w;
+  return std::move (w);
 }
 
 /* Attempt to merge THIS with OTHER, writing the result
@@ -556,7 +556,7 @@ region_model::make_dump_widget (const text_art::dump_widget_info &dwi) const
 			       m_mgr->get_store_manager ()));
   model_widget->add_child (m_constraints->make_dump_widget (dwi));
   model_widget->add_child (m_dynamic_extents.make_dump_widget (dwi));
-  return model_widget;
+  return std::move (model_widget);
 }
 
 /* Assert that this object is valid.  */
diff --git a/gcc/analyzer/region.cc b/gcc/analyzer/region.cc
index 1fc42f2..d5cfd47 100644
--- a/gcc/analyzer/region.cc
+++ b/gcc/analyzer/region.cc
@@ -1101,7 +1101,7 @@ region::make_dump_widget (const text_art::dump_widget_info &dwi,
   if (m_parent)
     w->add_child (m_parent->make_dump_widget (dwi, "parent"));
 
-  return w;
+  return std::move (w);
 }
 
 void
diff --git a/gcc/analyzer/store.cc b/gcc/analyzer/store.cc
index d5c1a9f..5a33d74 100644
--- a/gcc/analyzer/store.cc
+++ b/gcc/analyzer/store.cc
@@ -1489,7 +1489,7 @@ binding_cluster::make_dump_widget (const text_art::dump_widget_info &dwi,
 
       m_map.add_to_tree_widget (*cluster_widget, dwi);
 
-      return cluster_widget;
+      return std::move (cluster_widget);
     }
 }
 
@@ -2769,7 +2769,7 @@ store::make_dump_widget (const text_art::dump_widget_info &dwi,
       store_widget->add_child (std::move (parent_reg_widget));
     }
 
-  return store_widget;
+  return std::move (store_widget);
 }
 
 /* Get any svalue bound to REG, or NULL.  */
diff --git a/gcc/analyzer/svalue.cc b/gcc/analyzer/svalue.cc
index f1fd21e..b67780a 100644
--- a/gcc/analyzer/svalue.cc
+++ b/gcc/analyzer/svalue.cc
@@ -252,7 +252,7 @@ svalue::make_dump_widget (const text_art::dump_widget_info &dwi,
 
   add_dump_widget_children (*w, dwi);
 
-  return w;
+  return std::move (w);
 }
 
 /* If this svalue is a constant_svalue, return the underlying tree constant.