BIND 10 #371: adjust gen-rdatacode for faster build

[BIND 10 Development]

#371: adjust gen-rdatacode for faster build
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  Reporter:  jinmei        |            Owner:  jreed                
      Type:  enhancement   |           Status:  new                  
  Priority:  minor         |        Milestone:  y2 12 month milestone
 Component:  build system  |         Keywords:                       
 Sensitive:  0             |   Estimatedhours:  0                    
     Hours:  0             |         Billable:  1                    
Totalhours:  0             |         Internal:  0                    
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 I'd like to propose some small changes to src/lib/dns/gen-
 rdatacode.py(.in):
  - in order to decide whether to update rrclass.h, check mtime of
 dns/rdata instead of that of dns/rdata/in_1, etc.  in fact, this is more
 accurate because what we want to know is when a new supported RR class is
 added (in_1, ch_3, etc) rather than when some RR type is changed under an
 RR class.  this will also reduce the frequency of updating rrclass.h, and
 help reduce compile time.
  - in order to decide whether to update rrtype.h, check the mtimes of
 rrtype_nn.h files only, while the current version also checks the mtimes
 of rrtype_nn.cc files.  Assuming all .cc files have corresponding .h
 files, this should be sufficient, and this also helps reduce the frequency
 of updating rrtype.h (and compile time) when we are updating the
 definition of some RDATA.

 The proposed patch is attached to the ticket.

 This should be quite trivial, so I'm planning to merge it to trunk soon.
 But if someone can perform a quick sanity check on it, that would be
 great.  So I'm opening this ticket.

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Ticket URL: <http://bind10.isc.org/ticket/371>
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