[MacPorts] #62082: Error: ld64: Variant ld64_274 conflicts with ld64_xcode

[MacPorts]

#62082: Error: ld64: Variant ld64_274 conflicts with ld64_xcode
--------------------+--------------------
 Reporter:  dbl001  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.4
 Keywords:  ld64    |       Port:  ld64
--------------------+--------------------
 I am migrating my port from 10.11.6 to 10.15.7:

 Error: ld64: Variant ld64_274 conflicts with ld64_xcode

 $ sudo ./restore_ports.tcl myports.txt
 Warning: Skipping google-perftools (not in the ports tree)
 Error: ld64: Variant ld64_274 conflicts with ld64_xcode
 Error evaluating variants
     while executing
 "error "Error evaluating variants""
     (procedure "mportopen" line 59)
     invoked from within
 "mportopen $portInfo(porturl) [list subport $portInfo(name)] $variantInfo"
 Unable to open port 'ld64': Error evaluating variants
     while executing
 "dependenciesForPort $name $variants"
     (procedure "sort_ports" line 46)
     invoked from within
 "sort_ports $portList"
     invoked from within
 "set operationList [sort_ports $portList]"
     (file "./restore_ports.tcl" line 285)

 {{{
 ld64 @3_3+ld64_274 (active) platform='darwin 15' archs='x86_64'
 date='2020-04-28T12:11:31-0700'
   ld64-274 @274.2_0+llvm90 (active) platform='darwin 15' archs='x86_64'
 date='2020-04-25T08:18:08-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62082>
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