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macOS Improvement, master branch (2020.02.25.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:macOSImprovement-master-20200225 into master

Added explicit handling for CMP0068. To finally turn off the warning messages that have been plaguing the macOS builds since CMake 3.9. With messages like:

...
-- Configuring done
CMake Warning (dev):
  Policy CMP0068 is not set: RPATH settings on macOS do not affect
  install_name.  Run "cmake --help-policy CMP0068" for policy details.  Use
  the cmake_policy command to set the policy and suppress this warning.

  For compatibility with older versions of CMake, the install_name fields for
  the following targets are still affected by RPATH settings:

   AsgExampleToolsDict
   AsgExampleToolsLib
   AsgMessagingDict
   AsgMessagingLib
   AsgMessagingStandaloneDict
   AsgTestingLib
...

Unfortunately the setting has to be made here, since the cmake_minimum_required(...) call at the top of this file resets all settings that may have been set in let's say AnalysisBase/CMakeLists.txt. 😦

Pinging @krumnack.

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