[MacPorts] #71051: Macports should add a global "use_xcode yes" config option

[MacPorts]

#71051: Macports should add a global "use_xcode yes" config option
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  Reporter:  mouse07410   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by mouse07410):

 > The {{{use_xcode}}} variable exists so that ports that require Xcode can
 use it. If there are ports that require this to be set that haven't set
 it, individual bug reports should be filed for each of those ports

 True, but that is taking time and efforts, every time a port gets bitten
 by CLT incompatibility. It taxes (unnecessarily, IMHO) every port
 maintainer and users of that port. Plus, the time lag for discovery, time
 lag for discussion, time lag to incorporate the fix. All of which could be
 avoided if the {{{use_xcode}}} is added or move to (a) become **global**,
 and (b) **user-controlled**, rather than port maintainer-controlled.

 I'm advocating for turning the control of whether to use CLT or Xcode, to
 user.

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Ticket URL: <https://trac.macports.org/ticket/71051#comment:5>
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