* gdb_string.h: Moved to ...

* common/gdb_string.h: ... here.
	* common/vec.h: Remove #ifndef GDBSERVER conditional inclusion of
	gdb_string.h and gdb_assert.h.

	gdbserver/
	* configure.ac: Add check for strstr.
	* config.in: Regenerate.
	* configure: Regenerate.

	* linux-thread-db.c: #include "gdb_vecs.h".
	(try_thread_db_load_from_pdir_1): New arg "subdir".  All callers
	updated.
	(try_thread_db_load_from_pdir): New arg "subdir".  All callers updated.
	(thread_db_load_search): Use a vector to iterate over path elements.
	Handle text appearing after "$pdir".

	gdbserver/
	* Makefile.in (SFILES): Add gdb_vecs.c.
	(OBS): Add gdb_vecs.o.
	(gdb_vecs_h, host_defs_h): New variables.
	(thread-db.o): Add $(gdb_vecs_h) dependency.
	(gdb_vecs.o): New rule.
	* thread-db.c: #include "gdb_vecs.h".
	(thread_db_load_search): Use a vector to iterate over path elements.
	Handle text appearing after "$pdir".

gdb/linux-thread-db.c

@@ -23,7 +23,7 @@
 #include <dlfcn.h>
 #include "gdb_proc_service.h"
 #include "gdb_thread_db.h"
-
+#include "gdb_vecs.h"
 #include "bfd.h"
 #include "command.h"
 #include "exceptions.h"
@@ -881,11 +881,12 @@ try_thread_db_load (const char *library)
 }
 
 /* Subroutine of try_thread_db_load_from_pdir to simplify it.
-   Try loading libthread_db from the same directory as OBJ.
+   Try loading libthread_db in directory(OBJ)/SUBDIR.
+   SUBDIR may be NULL.  It may also be something like "../lib64".
    The result is true for success.  */
 
 static int
-try_thread_db_load_from_pdir_1 (struct objfile *obj)
+try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
 {
   struct cleanup *cleanup;
   char *path, *cp;
@@ -898,14 +899,21 @@ try_thread_db_load_from_pdir_1 (struct objfile *obj)
       return 0;
     }
 
-  path = xmalloc (strlen (obj->name) + 1 + strlen (LIBTHREAD_DB_SO) + 1);
+  path = xmalloc (strlen (obj->name) + (subdir ? strlen (subdir) + 1 : 0)
+		  + 1 + strlen (LIBTHREAD_DB_SO) + 1);
   cleanup = make_cleanup (xfree, path);
 
   strcpy (path, obj->name);
   cp = strrchr (path, '/');
   /* This should at minimum hit the first character.  */
   gdb_assert (cp != NULL);
-  strcpy (cp + 1, LIBTHREAD_DB_SO);
+  cp[1] = '\0';
+  if (subdir != NULL)
+    {
+      strcat (cp, subdir);
+      strcat (cp, "/");
+    }
+  strcat (cp, LIBTHREAD_DB_SO);
 
   if (!file_is_auto_load_safe (path, _("auto-load: Loading libthread-db "
 				       "library \"%s\" from $pdir.\n"),
@@ -919,11 +927,12 @@ try_thread_db_load_from_pdir_1 (struct objfile *obj)
 }
 
 /* Handle $pdir in libthread-db-search-path.
-   Look for libthread_db in the directory of libpthread.
+   Look for libthread_db in directory(libpthread)/SUBDIR.
+   SUBDIR may be NULL.  It may also be something like "../lib64".
    The result is true for success.  */
 
 static int
-try_thread_db_load_from_pdir (void)
+try_thread_db_load_from_pdir (const char *subdir)
 {
   struct objfile *obj;
 
@@ -933,14 +942,15 @@ try_thread_db_load_from_pdir (void)
   ALL_OBJFILES (obj)
     if (libpthread_name_p (obj->name))
       {
-	if (try_thread_db_load_from_pdir_1 (obj))
+	if (try_thread_db_load_from_pdir_1 (obj, subdir))
 	  return 1;
 
 	/* We may have found the separate-debug-info version of
 	   libpthread, and it may live in a directory without a matching
 	   libthread_db.  */
 	if (obj->separate_debug_objfile_backlink != NULL)
-	  return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink);
+	  return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink,
+						 subdir);
 
 	return 0;
       }
@@ -998,37 +1008,41 @@ try_thread_db_load_from_dir (const char *dir, size_t dir_len)
 static int
 thread_db_load_search (void)
 {
-  const char *search_path = libthread_db_search_path;
-  int rc = 0;
+  VEC (char_ptr) *dir_vec;
+  struct cleanup *cleanups;
+  char *this_dir;
+  int i, rc = 0;
 
-  while (*search_path)
+  dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
+  cleanups = make_cleanup_free_char_ptr_vec (dir_vec);
+
+  for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
     {
-      const char *end = strchr (search_path, ':');
-      const char *this_dir = search_path;
+      const int pdir_len = sizeof ("$pdir") - 1;
       size_t this_dir_len;
 
-      if (end)
-	{
-	  this_dir_len = end - search_path;
-	  search_path += this_dir_len + 1;
-	}
-      else
-	{
-	  this_dir_len = strlen (this_dir);
-	  search_path += this_dir_len;
-	}
+      this_dir_len = strlen (this_dir);
 
-      if (this_dir_len == sizeof ("$pdir") - 1
-	  && strncmp (this_dir, "$pdir", this_dir_len) == 0)
+      if (strncmp (this_dir, "$pdir", pdir_len) == 0
+	  && (this_dir[pdir_len] == '\0'
+	      || this_dir[pdir_len] == '/'))
 	{
-	  if (try_thread_db_load_from_pdir ())
+	  char *subdir = NULL;
+	  struct cleanup *free_subdir_cleanup = NULL;
+
+	  if (this_dir[pdir_len] == '/')
 	    {
-	      rc = 1;
-	      break;
+	      subdir = xmalloc (strlen (this_dir));
+	      free_subdir_cleanup = make_cleanup (xfree, subdir);
+	      strcpy (subdir, this_dir + pdir_len + 1);
 	    }
+	  rc = try_thread_db_load_from_pdir (subdir);
+	  if (free_subdir_cleanup != NULL)
+	    do_cleanups (free_subdir_cleanup);
+	  if (rc)
+	    break;
 	}
-      else if (this_dir_len == sizeof ("$sdir") - 1
-	       && strncmp (this_dir, "$sdir", this_dir_len) == 0)
+      else if (strcmp (this_dir, "$sdir") == 0)
 	{
 	  if (try_thread_db_load_from_sdir ())
 	    {
@@ -1046,6 +1060,7 @@ thread_db_load_search (void)
 	}
     }
 
+  do_cleanups (cleanups);
   if (libthread_db_debug)
     printf_unfiltered (_("thread_db_load_search returning %d\n"), rc);
   return rc;