[MacPorts] #57137: xcode portgroup should set -derivedDataPath on Xcode versions that need it

[MacPorts]

#57137: xcode portgroup should set -derivedDataPath on Xcode versions that need it
----------------------------+--------------------
  Reporter:  ryandesign     |      Owner:  (none)
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  xcode-1.0.tcl  |
----------------------------+--------------------

Comment (by RJVB):

 Replying to [comment:34 RJVB]:
 > Is there a safe os.version to check to determine if
 `-UseModernBuildSystem` is available or does one have to include the xcode
 PG?

 Apparently xcodebuild doesn't bail on unknown options?
 On my OS X 10.9.5 where `xcodebuild --help` does NOT list the option:

 {{{
 :info:build mkdir -p ./tmp/modules/gui/macosx
 :info:build cd "./modules/gui/macosx/" && cp *.h *.m /Volumes/VMs/MPbuild
 /_Volumes_Debian_MP9_site-
 ports_multimedia_VLC2/VLC2/work/vlc-2.2.8/tmp/modules/gui/macosx/
 :info:build cd ./tmp/extras/package/macosx && \
 :info:build         xcodebuild -target vlc -UseModernBuildSystem=NO
 SYMROOT=../../../build  DSTROOT=../../../build
 :info:build User defaults from command line:
 :info:build     UseModernBuildSystem = NO
 :info:build Build settings from command line:
 :info:build     DSTROOT = ../../../build
 :info:build     SYMROOT = ../../../build
 }}}

 The build result is the same with and without the option, so it looks like
 it can be added unconditionally?!

-- 
Ticket URL: <https://trac.macports.org/ticket/57137#comment:35>
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