[MacPorts] #60287: boost @1.71.0 does not build: clang: error: unknown argument: '-fcoalesce-templates'

[MacPorts]

#60287: boost @1.71.0 does not build: clang: error: unknown argument: '-fcoalesce-
templates'
------------------------+--------------------
 Reporter:  i0ntempest  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  boost
------------------------+--------------------
 It seems that clang is used to build despite it's configured to use gcc. I
 added `compiler.blacklist clang macports-clang` and now it builds, but I'm
 not sure it's the best thing to do so I'm opening a ticket.
 Build log attached.

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Ticket URL: <https://trac.macports.org/ticket/60287>
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