[MacPorts] #72150: clang-20 failed to build on < 10.14

[MacPorts]

#72150: clang-20 failed to build on < 10.14
-------------------------------+--------------------------
  Reporter:  jmroot            |      Owner:  cjones051073
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  clang-20 llvm-20  |
-------------------------------+--------------------------

Comment (by cjones051073):

 Errors are not the same for each

 Sanitizers are alrady disabled on Darwin 15 and older (Will extend to 17).
 On older OSes we get


 {{{
 /Library/Developer/CommandLineTools/SDKs/MacOSX10.12.sdk/usr/include/sys/_types/_mbstate_t.h:31:9:
 error: unknown type name '__darwin_mbstate_t'
    31 | typedef __darwin_mbstate_t mbstate_t;
       |         ^
 1 error generated.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/72150#comment:1>
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