Merge GDB 7.5.1

include/vms/lbr.h

 /* Alpha VMS external format of Libraries.
 
    Copyright 2010 Free Software Foundation, Inc.
    Written by Tristan Gingold <gingold@adacore.com>, AdaCore.
 
    This file is part of BFD, the Binary File Descriptor library.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
@@ skipping 69 matching lines @@
   unsigned char spareword[2];
 
   /* First free block, and number of free blocks.  */
   unsigned char freevbn[4];
   unsigned char freeblk[4];
 
   unsigned char nextrfa[6];
   unsigned char nextvbn[4];
 
   /* Free pre-allocated index block.  */
+  /* Number of free blocks.  */
   unsigned char freidxblk[4];
+  /* VBN of a simply linked list of free blocks.  The list is terminated by a
+     nul VBN.  */
   unsigned char freeidx[4];
 
   /* Highest pre-allocated index block and in use.  */
   unsigned char hipreal[4];
   unsigned char hiprusd[4];
 
   /* Number of index blocks in use.  */
   unsigned char idxblks[4];
 
   /* Number of index entries.  */
@@ skipping 219 matching lines @@
 {
   unsigned char date[8];
   unsigned char nbr_units[2];
   unsigned char action[2]; /* 1: delete, 2: insert, 3: replaced.  */
   unsigned char idlen;
   /* username
      modules... */
 };
 
 #endif /* _VMS_LBR_H */