BIND 10 #2705: clang unused-private-field errors

[BIND 10 Development]

#2705: clang unused-private-field errors
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  jinmei
            Priority:  medium        |                       Status:
           Component:  build system  |  accepted
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130305
         Sub-Project:  Core          |                   Resolution:
Estimated Difficulty:  3             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 trac2705 is ready for review.

 you may not be confirm it "fixes" the problem unless you have this
 version of clang++, but anyone should be easily able to check it
 doesn't do any harm.  And, I confirmed it fixed the problem in my
 environment.

 One possibly controversial point is how to handle DHCP's
 `Pool6::prefix_len_`.  I was not sure it was actually intended to be
 used (in which case the fact it's not used is a real bug) or we can
 simply remove it, so in this branch I kept the variable and actually
 used it in argument validation (with a comment about the intent).  I
 also opened a ticket for the DHCP team.  So, independently from what
 we should do for this, I believe we can merge this branch.

 I don't think we need a changelog entry for this change.  Due to the
 false positive of configure.ac (which is also fixed in this branch),
 this problem actually didn't cause build failure, so the change is
 basically not visible for users.

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Ticket URL: <http://bind10.isc.org/ticket/2705#comment:4>
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