BIND 10 #3068: Add more g++ CXXFLAGS (-Wnon-virtual-dtor, etc.)

[BIND 10 Development]

#3068: Add more g++ CXXFLAGS (-Wnon-virtual-dtor, etc.)
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            Reporter:  muks          |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  build system  |  reviewing
            Keywords:                |                    Milestone:  Next-
           Sensitive:  0             |  Sprint-Proposed
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  0             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * status:  new => reviewing


Comment:

 I also wanted to add things like:

 * `-Wold-style-cast`, but that has problems with system macros like
 `CMSG_LEN()` that use old style casting.

 * `-Weffc++` but a lot of dependencies code fails with it.

 So we just added `-Wnon-virtual-dtor`. Up for review.

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Ticket URL: <http://bind10.isc.org/ticket/3068#comment:1>
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