[CMake] cmake policy CMP0022 error

[Clinton Stimpson]

I have a target where I do this:
SET_TARGET_PROPERTIES(mytarget PROPERTIES LINK_INTERFACE_LIBRARIES "")
to hide 3rd party libraries from the link interface.

When I do
if(APPLE)
  CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
endif()
I get an error at generate time.

This is different than my previous experiences with cmake policies.  Based on 
past experiences, I expected to see a warning if I had 
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
but used CMake 2.8.12 which introduced CMP0022.

But in this case, I don't see a warning.
The error I get with 
CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
is:
CMake Error in .../CMakeLists.txt:
  Target "mytarget" has policy CMP0022 enabled, but also has old-style
  LINK_INTERFACE_LIBRARIES properties populated, but it was exported without
  the EXPORT_LINK_INTERFACE_LIBRARIES to export the old-style properties


When I read the output from cmake --help-policy CMP0022, its not clear to me 
why I'm getting the error.

-- 
Clinton Stimpson
Elemental Technologies, Inc
Computational Simulation Software, LLC
www.csimsoft.com