[MacPorts] #68373: boost176: error: integer value -1 is outside the valid range of values [0, 3] for this enumeration type [-Wenum-constexpr-conversion]

[MacPorts]

#68373: boost176: error: integer value -1 is outside the valid range of values [0,
3] for this enumeration type [-Wenum-constexpr-conversion]
--------------------+-----------------------
 Reporter:  mf2k    |      Owner:  michaelld
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.8.99
 Keywords:          |       Port:  boost
--------------------+-----------------------
 boost176 is not building on Xcode 15.

 {{{
 :info:build ./boost/mpl/aux_/integral_wrapper.hpp:73:31: error: integer
 value -1 is outside the valid range of values [0, 3] for this enumeration
 type [-Wenum-constexpr-conversion]
 }}}

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Ticket URL: <https://trac.macports.org/ticket/68373>
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