[MacPorts] #62799: legacy-support: build-only dependency not working?

[MacPorts]

#62799: legacy-support: build-only dependency not working?
--------------------+----------------------------
 Reporter:  kencu   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  legacy-support
--------------------+----------------------------
 when legacy-support is used as a build dependency and links statically, as
 it does in llvm/clang-11, then those ports should not be tied to legacy-
 support after the build, and they should not complain if it is being
 deactivated, as they no longer need it.

 However, they do complain:
 {{{
 $ sudo port deactivate legacy-support
 Note: It is not recommended to uninstall/deactivate a port that has
 dependents as it breaks the dependents.
 The following ports will break:
  llvm-11 @11.1.0_0
  clang-11 @11.1.0_1
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62799>
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