[MacPorts] #70859: gmp @6.3.0: tests fail when built with clang on Intel only, but pass when assembly is disabled. Forcing ld_classic appears to fix the issue.

[MacPorts]

#70859: gmp @6.3.0: tests fail when built with clang on Intel only, but pass when
assembly is disabled. Forcing ld_classic appears to fix the issue.
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  Reporter:  haberg-1  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  ventura
      Port:  gmp       |
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Comment (by cjones051073):

 b.t.w. is not blacklisting Xcode clang for 16 and above and just falling
 back to using a macports clang build (18 say) not a viable workaround for
 now as well ?

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Ticket URL: <https://trac.macports.org/ticket/70859#comment:49>
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