address #835

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/muz/rel/dl_relation_manager.cpp

@@ -1622,6 +1622,8 @@ namespace datalog {
             m_union_fn = plugin.mk_union_fn(t, *m_aux_table, static_cast<table_base *>(0));
         }
 
+        virtual ~default_table_map() {}
+
         virtual void operator()(table_base & t) {
             SASSERT(t.get_signature()==m_aux_table->get_signature());
             if(!m_aux_table->empty()) {
@@ -1678,6 +1680,8 @@ namespace datalog {
             m_former_row.resize(get_result_signature().size());
         }
 
+        virtual ~default_table_project_with_reduce_fn() {}
+
         virtual void modify_fact(table_fact & f) const {
             unsigned ofs=1;
             unsigned r_i=1;

src/qe/qe_arrays.cpp

@@ -110,7 +110,7 @@ namespace qe {
         imp(ast_manager& m): m(m), a(m) {}
         ~imp() {}
 
-        virtual bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
+        bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
             return false;
         }
 

src/qe/qe_datatypes.cpp

@@ -37,7 +37,7 @@ namespace qe {
         imp(ast_manager& m):
             m(m), dt(m), m_val(m) {}
         
-        virtual bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
+        bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
             return lift_foreign(vars, lits);
         }
 

src/smt/smt_model_finder.cpp

@@ -498,7 +498,7 @@ namespace smt {
                 m_bvsimp = static_cast<bv_simplifier_plugin*>(s.get_plugin(m.mk_family_id("bv")));
             }
 
-            ~auf_solver() {
+            virtual ~auf_solver() {
                 flush_nodes();
                 reset_eval_cache();
             }

src/tactic/fpa/fpa2bv_tactic.cpp

@@ -46,7 +46,7 @@ class fpa2bv_tactic : public tactic {
             m_rw.cfg().updt_params(p);
         }
 
-        virtual void operator()(goal_ref const & g,
+        void operator()(goal_ref const & g,
                         goal_ref_buffer & result,
                         model_converter_ref & mc,
                         proof_converter_ref & pc,