Add debug redirect option

Currently, when logging is enabled, output will be sent to both a
logfile and standard terminal output.  The redirect option sends output
only to the logfile.  This includes all debug output.

Add the option to redirect debug output seperately to normal
output, using the cli command:

  set logging debugredirect on

By setting this and enabling logging, all output and debug will
be sent to the logfile.  The user will still see all output but
no debug output.

This causes a change in behaviour for anyone currently using
logging redirect, as now only output will be redirected.  Users
will have to issue the additional command above to also redirect
debug.

Expand ui-redirect.exp cover the changes.

gdb/ChangeLog:

	* cli/cli-interp.c (struct saved_output_files): Add saved entry.
	(cli_interp_base::set_logging): Check debug_redirect.
	* cli/cli-interp.h (set_logging): Add debug_redirect parameter.
	* cli/cli-logging.c (debug_redirect): Add static variable.
	(pop_output_files): Add default param.
	(handle_redirections): Print debug setting.
	(show_logging_command): Likewise.
	(_initialize_cli_logging): Add debugredirect command.
	* interps.c (current_interp_set_logging): Add debug_redirect
	parameter.
	* interps.h (set_logging): Add debug_redirect parameter.
	(current_interp_set_logging): Likewise.
	* mi/mi-common.h: Likewise.
	* mi/mi-interp.c (mi_interp::set_logging): Likewise.

gdb/testsuite/ChangeLog:

	* gdb.base/ui-redirect.exp: Add debug redirect tests.

3 files changed, 47 insertions, 14 deletions

diff --git a/gdb/cli/cli-interp.c b/gdb/cli/cli-interp.c
index 7876f910806..a8cf6172c1b 100644
--- a/gdb/cli/cli-interp.c
+++ b/gdb/cli/cli-interp.c
@@ -395,13 +395,15 @@ struct saved_output_files
   ui_file *log;
   ui_file *targ;
   ui_file *targerr;
+  ui_file *file_to_delete;
 };
 static saved_output_files saved_output;
 
 /* See cli-interp.h.  */
 
 void
-cli_interp_base::set_logging (ui_file_up logfile, bool logging_redirect)
+cli_interp_base::set_logging (ui_file_up logfile, bool logging_redirect,
+			      bool debug_redirect)
 {
   if (logfile != nullptr)
     {
@@ -411,28 +413,34 @@ cli_interp_base::set_logging (ui_file_up logfile, bool logging_redirect)
       saved_output.targ = gdb_stdtarg;
       saved_output.targerr = gdb_stdtargerr;
 
-      /* If logging is being redirected, then grab logfile.  */
+      /* If something is being redirected, then grab logfile.  */
       ui_file *logfile_p = nullptr;
-      if (logging_redirect)
-	logfile_p = logfile.release ();
+      if (logging_redirect || debug_redirect)
+	{
+	  logfile_p = logfile.get ();
+	  saved_output.file_to_delete = logfile_p;
+	}
 
-      /* If logging is not being redirected, then a tee containing both the
+      /* If something is not being redirected, then a tee containing both the
 	 logfile and stdout.  */
       ui_file *tee = nullptr;
-      if (!logging_redirect)
-	tee = new tee_file (gdb_stdout, std::move (logfile));
+      if (!logging_redirect || !debug_redirect)
+	{
+	  tee = new tee_file (gdb_stdout, std::move (logfile));
+	  saved_output.file_to_delete = tee;
+	}
 
       gdb_stdout = logging_redirect ? logfile_p : tee;
-      gdb_stdlog = logging_redirect ? logfile_p : tee;
+      gdb_stdlog = debug_redirect ? logfile_p : tee;
       gdb_stderr = logging_redirect ? logfile_p : tee;
       gdb_stdtarg = logging_redirect ? logfile_p : tee;
       gdb_stdtargerr = logging_redirect ? logfile_p : tee;
     }
   else
     {
-      /* Only delete one of the files -- they are all set to the same
-	 value.  */
-      delete gdb_stdout;
+      /* Delete the correct file.  If it's the tee then the logfile will also
+	 be deleted.  */
+      delete saved_output.file_to_delete;
 
       gdb_stdout = saved_output.out;
       gdb_stderr = saved_output.err;
@@ -445,6 +453,7 @@ cli_interp_base::set_logging (ui_file_up logfile, bool logging_redirect)
       saved_output.log = nullptr;
       saved_output.targ = nullptr;
       saved_output.targerr = nullptr;
+      saved_output.file_to_delete = nullptr;
     }
 }
 
diff --git a/gdb/cli/cli-interp.h b/gdb/cli/cli-interp.h
index 0c2e73b6b38..334a37accf8 100644
--- a/gdb/cli/cli-interp.h
+++ b/gdb/cli/cli-interp.h
@@ -28,7 +28,8 @@ public:
   explicit cli_interp_base (const char *name);
   virtual ~cli_interp_base () = 0;
 
-  void set_logging (ui_file_up logfile, bool logging_redirect) override;
+  void set_logging (ui_file_up logfile, bool logging_redirect,
+		    bool debug_redirect) override;
   void pre_command_loop () override;
   bool supports_command_editing () override;
 };
diff --git a/gdb/cli/cli-logging.c b/gdb/cli/cli-logging.c
index 670e7e24908..bef5f3939bd 100644
--- a/gdb/cli/cli-logging.c
+++ b/gdb/cli/cli-logging.c
@@ -62,6 +62,7 @@ show_logging_overwrite (struct ui_file *file, int from_tty,
 
 /* Value as configured by the user.  */
 static int logging_redirect;
+static int debug_redirect;
 
 static void
 set_logging_redirect (const char *args,
@@ -81,7 +82,7 @@ show_logging_redirect (struct ui_file *file, int from_tty,
 static void
 pop_output_files (void)
 {
-  current_interp_set_logging (NULL, false);
+  current_interp_set_logging (NULL, false, false);
 
   /* Stay consistent with handle_redirections.  */
   if (!current_uiout->is_mi_like_p ())
@@ -112,12 +113,20 @@ handle_redirections (int from_tty)
       else
 	fprintf_unfiltered (gdb_stdout, "Redirecting output to %s.\n",
 			    logging_filename);
+
+      if (!debug_redirect)
+	fprintf_unfiltered (gdb_stdout, "Copying debug output to %s.\n",
+			    logging_filename);
+      else
+	fprintf_unfiltered (gdb_stdout, "Redirecting debug output to %s.\n",
+			    logging_filename);
     }
 
   saved_filename = xstrdup (logging_filename);
 
   /* Let the interpreter do anything it needs.  */
-  current_interp_set_logging (std::move (log), logging_redirect);
+  current_interp_set_logging (std::move (log), logging_redirect,
+			      debug_redirect);
 
   /* Redirect the current ui-out object's output to the log.  Use
      gdb_stdout, not log, since the interpreter may have created a tee
@@ -185,6 +194,11 @@ show_logging_command (const char *args, int from_tty)
     printf_unfiltered (_("Output will be sent only to the log file.\n"));
   else
     printf_unfiltered (_("Output will be logged and displayed.\n"));
+
+  if (debug_redirect)
+    printf_unfiltered (_("Debug output will be sent only to the log file.\n"));
+  else
+    printf_unfiltered (_("Debug output will be logged and displayed.\n"));
 }
 
 void
@@ -213,6 +227,15 @@ If redirect is on, output will go only to the log file."),
 			   set_logging_redirect,
 			   show_logging_redirect,
 			   &set_logging_cmdlist, &show_logging_cmdlist);
+  add_setshow_boolean_cmd ("debugredirect", class_support,
+			   &debug_redirect, _("\
+Set the logging debug output mode."), _("\
+Show the logging debug output mode."), _("\
+If debug redirect is off, debug will go to both the screen and the log file.\n\
+If debug redirect is on, debug will go only to the log file."),
+			   set_logging_redirect,
+			   show_logging_redirect,
+			   &set_logging_cmdlist, &show_logging_cmdlist);
   add_setshow_filename_cmd ("file", class_support, &logging_filename, _("\
 Set the current logfile."), _("\
 Show the current logfile."), _("\