[MacPorts] #48926: Xcode 7 update seems to cause /usr/bin/clang --version to hang which causes ./configure to hang

[MacPorts]

#48926: Xcode 7 update seems to cause /usr/bin/clang --version to hang which causes
./configure to hang
----------------------+--------------------------------
  Reporter:  david@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.3
Resolution:           |   Keywords:
      Port:           |
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Comment (by david@…):

 Here's how I fixed this, as someone else might hit the same problem.

 1) Run xcodebuild -showsdks + if there's no "-sdk macosx10.10" then
 continue

 2) Download Xcode-6.4.dmg (command line tools appear to be packaged in the
 Xcode dmg)

 3) mv /Applications/Xcode /Applications/Xcode-7.0

 4) Install Xcode-6.4.dmg

 5) If everything worked, you should see...

 imac# xcodebuild -showsdks
 OS X SDKs:
         OS X 10.9                       -sdk macosx10.9
         OS X 10.10                      -sdk macosx10.10

 /usr/bin/gcc --version
 Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
 --with-gxx-include-dir=/usr/include/c++/4.2.1
 Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
 Target: x86_64-apple-darwin14.5.0
 Thread model: posix

 If not, navigate to /Applications/Xcode -> Preferences -> Locations ->
 Change "Command Line Tools" to 6.4

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Ticket URL: <https://trac.macports.org/ticket/48926#comment:2>
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