[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.
-----------------------+---------------------------------
  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 kencu):

 You are correct that a linker is installed with all our recent clang
 ports. However, it is not used, by default at least. I believe that even
 on the most recent llvm builds that linker is not considered "ready for
 prime time". I believe the new xcode linker (which is causing our troubles
 here) is a fork of that project, however.

 The linker used by default by macports-clang versions continues to be the
 one pointed to by the ld64 port with it's shim in {{{${prefix}/bin/ld}}},
 and most often that points to {{{ld64 +xcode}}} to pick up the xcode-
 supplied linker.

 I did mention that on MacOS 12.7 gmp built without troubles using clang-18
 to build it. MacOS 12.7 uses the xcode linker, which at that stage of
 things is equivalent to "ld_classic". I was using that example more to
 support the idea that it wasn't something with newer clangs that was
 causing the build errors, it was something else (like the linker).

-- 
Ticket URL: <https://trac.macports.org/ticket/70859#comment:52>
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