[MacPorts] #66965: i2pd: fix building shared libs

[MacPorts]

#66965: i2pd: fix building shared libs
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  Reporter:  herbygillot  |      Owner:  herbygillot
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  i2pd         |
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Comment (by kencu):

 In general, it is difficult to have cmake build both static and shared
 libs of one codebase. It is not a built-in cmake feature to do that, it is
 usually one or the other with cmake.

 People have done it; you can look at their cmake files to see what tricks
 were done to allow it.

 On the other hand, with Makefiles it is really pretty trivial to do that.
 Just another line and another target.

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Ticket URL: <https://trac.macports.org/ticket/66965#comment:1>
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