lib: Add some virtual dtors

Classes where we call delete (implicitly or explicitly) with a virtual
inheritance structure need to declare dtors as virtual.
This reduces compiler warnings with clang. There are no known bugs (yet)
due to this.

host/lib/include/uhdlib/transport/inline_io_service.hpp

@@ -31,7 +31,7 @@ public:
         return sptr(new inline_io_service());
     }
 
-    ~inline_io_service();
+    virtual ~inline_io_service();
 
     void attach_recv_link(recv_link_if::sptr link) override;
     void attach_send_link(send_link_if::sptr link) override;

host/lib/include/uhdlib/transport/io_service.hpp

@@ -104,6 +104,8 @@ class recv_io_if
 public:
     using sptr = std::shared_ptr<recv_io_if>;
 
+    virtual ~recv_io_if() = default;
+
     /*!
      * Callback for producing a flow control response (or any other response
      * needed when a received frame_buff is released via
@@ -188,6 +190,8 @@ class send_io_if
 public:
     using sptr = std::shared_ptr<send_io_if>;
 
+    virtual ~send_io_if() = default;
+
     /*!
      * Callback for sending the packet. Callback should call release_send_buff()
      * and update any internal state needed. For example, flow control state
@@ -366,6 +370,7 @@ public:
     io_service()                  = default;
     io_service(const io_service&) = delete;
     io_service& operator=(const io_service&) = delete;
+    virtual ~io_service()                    = default;
 };
 
 }} // namespace uhd::transport

host/lib/include/uhdlib/transport/link_base.hpp

@@ -74,6 +74,8 @@ public:
     {
     }
 
+    virtual ~send_link_base() = default;
+
     size_t get_num_send_frames() const override
     {
         return _num_send_frames;
@@ -164,7 +166,13 @@ public:
     {
     }
 
+<<<<<<< HEAD
     size_t get_num_recv_frames() const override
+=======
+    virtual ~recv_link_base() = default;
+
+    virtual size_t get_num_recv_frames() const
+>>>>>>> lib: Add some virtual dtors
     {
         return _num_recv_frames;
     }

host/lib/include/uhdlib/usrp/common/adf4001_ctrl.hpp

@@ -105,6 +105,7 @@ class adf4001_ctrl
 {
 public:
     adf4001_ctrl(uhd::spi_iface::sptr _spi, int slaveno);
+    virtual ~adf4001_ctrl() = default;
     virtual void set_lock_to_ext_ref(bool external);
 
 private:

host/lib/include/uhdlib/usrp/common/io_service_mgr.hpp

@@ -59,6 +59,8 @@ class io_service_mgr
 public:
     using sptr = std::shared_ptr<io_service_mgr>;
 
+    virtual ~io_service_mgr() = default;
+
     /*! Connects a pair of links to an I/O service
      *
      * Call this method to connect a pair of links to an I/O service. For muxed

host/lib/include/uhdlib/usrp/common/pwr_cal_mgr.hpp

@@ -80,6 +80,8 @@ public:
         get_str_type&& get_key,
         uhd::gain_group::sptr gain_group);
 
+    virtual ~pwr_cal_mgr() = default;
+
     //! Update the gain group (see make());
     //
     // Not thread-safe: Don't call at the same time as set_power()