[MacPorts] #68640: clang-18: Undefined symbols on older OSes

[MacPorts]

#68640: clang-18: Undefined symbols on older OSes
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  Reporter:  snowflake  |      Owner:  nobody
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch
      Port:  clang-18   |
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Comment (by brettyhale):

 Replying to [comment:59 cjones051073]:
 > Above commits implement the changes for clang16-18
 >
 > clang17 now works OK for me, tested fine on MacOSX10.11 for a few of the
 previously failing ports.
 >
 > clang18 seems to have another issue, e.g. mesa on MacOSX10.11

 > so for now clang18 is still not allowed on older OSes.

 I'm having the same issue with Catalina 10.15.7 - clang-17 works fine, but
 I get linker errors for <iostream> file I/O on both clang-18 and clang-19
 - so I'm restricted to clang-17 for now.

-- 
Ticket URL: <https://trac.macports.org/ticket/68640#comment:61>
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