BIND 10 #995: use "convenience libraries" to share .cc in multiple targets

[BIND 10 Development]

#995: use "convenience libraries" to share .cc in multiple targets
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            Reporter:  jinmei        |                        Owner:  jreed
                Type:  enhancement   |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  build system  |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Currently we compile some .cc files multiple times, once for a main
 target (such as b10-auth), and in other cases for tests and
 benchmarks.  The additional compilation is simply redundant and
 (though maybe relatively marginal) contribute to increasing the
 already large build time of BIND 10.

 I propose we use the "convenience library" feature of automake to avoid
 the duplicate compilation.  See this link for convenience libraries:
 http://sourceware.org/autobook/autobook/autobook_92.html

 (At least in theory) this should be a beneficial (and mostly trivial)
 change at no risk of regression.

 Both b10-auth and b10-recurse should be able to benefit from this, and
 there may be some others.

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Ticket URL: <http://bind10.isc.org/ticket/995>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development