[MacPorts] #63460: cmake-3.21.2_0 fails to configure on older Xcode clang versions

[MacPorts]

#63460: cmake-3.21.2_0 fails to configure on older Xcode clang versions
---------------------+----------------------------
  Reporter:  tehcog  |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  High    |  Milestone:
 Component:  ports   |    Version:  2.7.1
Resolution:          |   Keywords:  lion mavericks
      Port:  cmake   |
---------------------+----------------------------

Comment (by michaelld):

 This matches what's in the attached logfile. My guess is that CMake's
 scripts are not compatible with this version of clang and/or vice versa:
 clang is misleading about what flags it accepts.
 {{{
 % clang++ -v
 Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
 Target: x86_64-apple-darwin13.4.0
 Thread model: posix
 }}}

 This is Xcode 6.2: "Xcode 6.2 is the last release of Xcode that supports
 running on OS X Mavericks." according to
 [https://developer.apple.com/library/archive/releasenotes/DeveloperTools
 /RN-
 Xcode/Chapters/Introduction.html#//apple_ref/doc/uid/TP40001051-CH1-SW423
 Apple's docs].

-- 
Ticket URL: <https://trac.macports.org/ticket/63460#comment:16>
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