[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'
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  Reporter:  i0ntempest  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  boost       |
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Description changed by i0ntempest:

Old description:

> It seems that clang is used to build despite it's configured to use gcc.
> I added `compiler.blacklist 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.

New description:

 It seems that boost can't choose the right compiler or can't get the
 compiler version right, so it ends up adding an arg that the used compiler
 doesn't recognize. I added `compiler.blacklist 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#comment:3>
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