[rfa] Delete keep_thread_db

[Andrew Cagney <cagney@gnu.org>]

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It would appear that, at one stage, this variable had something to do 
with corefiles, static programs and threads.  That's no longer the case 
so this deletes the stray global.

Tested on FC3 with no regressions,

Ok?
Andrew

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Index: ChangeLog
2004-09-05  Andrew Cagney  <cagney@gnu.org>

	* thread-db.c (keep_thread_db): Delete.
	(thread_db_new_objfile, thread_db_create_inferior)
	(thread_db_mourn_inferior): Simplify assuming !keep_thread_db.

Index: thread-db.c
===================================================================
RCS file: /cvs/src/src/gdb/thread-db.c,v
retrieving revision 1.43
diff -p -u -r1.43 thread-db.c
--- thread-db.c	22 Jul 2004 01:31:49 -0000	1.43
+++ thread-db.c	5 Sep 2004 15:57:45 -0000
@@ -63,10 +63,6 @@ static void (*target_new_objfile_chain) 
 /* Non-zero if we're using this module's target vector.  */
 static int using_thread_db;
 
-/* Non-zero if we have to keep this module's target vector active
-   across re-runs.  */
-static int keep_thread_db;
-
 /* Non-zero if we have determined the signals used by the threads
    library.  */
 static int thread_signals;
@@ -673,8 +669,6 @@ thread_db_new_objfile (struct objfile *o
 	  using_thread_db = 0;
 	}
 
-      keep_thread_db = 0;
-
       goto quit;
     }
 
@@ -703,18 +697,6 @@ thread_db_new_objfile (struct objfile *o
       push_target (&thread_db_ops);
       using_thread_db = 1;
 
-      /* If the thread library was detected in the main symbol file
-         itself, we assume that the program was statically linked
-         against the thread library and well have to keep this
-         module's target vector activated until forever...  Well, at
-         least until all symbols have been discarded anyway (see
-         above).  */
-      if (objfile == symfile_objfile)
-	{
-	  gdb_assert (proc_handle.pid == 0);
-	  keep_thread_db = 1;
-	}
-
       /* We can only poke around if there actually is a child process.
          If there is no child process alive, postpone the steps below
          until one has been created.  */
@@ -1106,12 +1088,8 @@ static void
 thread_db_create_inferior (char *exec_file, char *allargs, char **env,
 			   int from_tty)
 {
-  if (!keep_thread_db)
-    {
-      unpush_target (&thread_db_ops);
-      using_thread_db = 0;
-    }
-
+  unpush_target (&thread_db_ops);
+  using_thread_db = 0;
   target_beneath->to_create_inferior (exec_file, allargs, env, from_tty);
 }
 
@@ -1141,17 +1119,9 @@ thread_db_mourn_inferior (void)
 
   target_beneath->to_mourn_inferior ();
 
-  /* Detach thread_db target ops if not dealing with a statically
-     linked threaded program.  This allows a corefile to be debugged
-     after finishing debugging of a threaded program.  At present,
-     debugging a statically-linked threaded program is broken, but
-     the check is added below in the event that it is fixed in the
-     future.  */
-  if (!keep_thread_db)
-    {
-      unpush_target (&thread_db_ops);
-      using_thread_db = 0;
-    }
+  /* Detach thread_db target ops.  */
+  unpush_target (&thread_db_ops);
+  using_thread_db = 0;
 }
 
 static int