Don't let tee_file own a stream

Right now, tee_file owns the second stream it writes to.  This is done
for the convenience of the users.  In a subsequent patch, this will no
longer be convenient, so this patch moves the responsibility for
ownership to the users of tee_file.

gdb/cli/cli-interp.c

@@ -386,17 +386,18 @@ cli_interp_base::set_logging (ui_file_up logfile, bool logging_redirect,
       m_saved_output->targ = gdb_stdtarg;
       m_saved_output->targerr = gdb_stdtargerr;
 
+      ui_file *logfile_p = logfile.get ();
+      m_saved_output->file_to_delete = std::move (logfile);
+
       /* If something is not being redirected, then a tee containing both the
 	 logfile and stdout.  */
-      ui_file *logfile_p = logfile.get ();
       ui_file *tee = nullptr;
       if (!logging_redirect || !debug_redirect)
 	{
-	  tee = new tee_file (gdb_stdout, std::move (logfile));
+	  m_saved_output->tee_to_delete.reset
-	  m_saved_output->file_to_delete.reset (tee);
+	    (new tee_file (gdb_stdout, logfile_p));
+	  tee = m_saved_output->tee_to_delete.get ();
 	}
-      else
-	m_saved_output->file_to_delete = std::move (logfile);
 
       m_saved_output->log_to_delete.reset
 	(new timestamped_file (debug_redirect ? logfile_p : tee));

gdb/cli/cli-interp.h

@@ -41,6 +41,7 @@ private:
     ui_file *log;
     ui_file *targ;
     ui_file *targerr;
+    ui_file_up tee_to_delete;
     ui_file_up file_to_delete;
     ui_file_up log_to_delete;
   };

gdb/mi/mi-interp.c

@@ -1275,21 +1275,16 @@ mi_interp::set_logging (ui_file_up logfile, bool logging_redirect,
     {
       mi->saved_raw_stdout = mi->raw_stdout;
 
-      /* If something is being redirected, then grab logfile.  */
+      ui_file *logfile_p = logfile.get ();
-      ui_file *logfile_p = nullptr;
+      mi->saved_raw_file_to_delete = logfile.release ();
-      if (logging_redirect || debug_redirect)
-	{
-	  logfile_p = logfile.get ();
-	  mi->saved_raw_file_to_delete = logfile_p;
-	}
 
       /* If something is not being redirected, then a tee containing both the
 	 logfile and stdout.  */
       ui_file *tee = nullptr;
       if (!logging_redirect || !debug_redirect)
 	{
-	  tee = new tee_file (mi->raw_stdout, std::move (logfile));
+	  tee = new tee_file (mi->raw_stdout, logfile_p);
-	  mi->saved_raw_file_to_delete = tee;
+	  mi->saved_tee_to_delete = tee;
 	}
 
       mi->raw_stdout = logging_redirect ? logfile_p : tee;
@@ -1297,9 +1292,11 @@ mi_interp::set_logging (ui_file_up logfile, bool logging_redirect,
   else
     {
       delete mi->saved_raw_file_to_delete;
+      delete mi->saved_tee_to_delete;
       mi->raw_stdout = mi->saved_raw_stdout;
       mi->saved_raw_stdout = nullptr;
       mi->saved_raw_file_to_delete = nullptr;
+      mi->saved_tee_to_delete = nullptr;
     }
 
   mi->out->set_raw (mi->raw_stdout);

gdb/mi/mi-interp.h

@@ -57,7 +57,7 @@ public:
      done.  */
   struct ui_file *saved_raw_stdout;
   struct ui_file *saved_raw_file_to_delete;
-
+  struct ui_file *saved_tee_to_delete;
 
   /* MI's builder.  */
   struct ui_out *mi_uiout;

gdb/ui-file.c

@@ -384,9 +384,9 @@ stderr_file::stderr_file (FILE *stream)
 
 
 
-tee_file::tee_file (ui_file *one, ui_file_up &&two)
+tee_file::tee_file (ui_file *one, ui_file *two)
   : m_one (one),
-    m_two (std::move (two))
+    m_two (two)
 {}
 
 tee_file::~tee_file ()

gdb/ui-file.h

@@ -329,9 +329,9 @@ public:
 class tee_file : public ui_file
 {
 public:
-  /* Create a file which writes to both ONE and TWO.  ONE will remain
+  /* Create a file which writes to both ONE and TWO.  Ownership of
-     open when this object is destroyed; but TWO will be closed.  */
+     both files is up to the user.  */
-  tee_file (ui_file *one, ui_file_up &&two);
+  tee_file (ui_file *one, ui_file *two);
   ~tee_file () override;
 
   void write (const char *buf, long length_buf) override;
@@ -364,7 +364,7 @@ public:
 private:
   /* The two underlying ui_files.  */
   ui_file *m_one;
-  ui_file_up m_two;
+  ui_file *m_two;
 };
 
 /* A ui_file implementation that filters out terminal escape