[CMake] CMAKE_OSX_DEPLOYMENT_TARGET vs CMAKE_OSX_SYSROOT

[Braden McDaniel]

When setting CMAKE_OSX_SYSROOT to the unversioned directory name
(using Xcode 8, as it happens) and setting
CMAKE_OSX_DEPLOYMENT_TARGET, I get this error:

-- The CXX compiler identification is AppleClang 8.0.0.8000038
 CMake Error at
/Applications/CMake.app/Contents/share/cmake-3.6/Modules/Platform/Darwin.cmake:76
(message):
 CMAKE_OSX_DEPLOYMENT_TARGET is '10.10' but CMAKE_OSX_SYSROOT:

 "/Applications/Xcode-8.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"

 is not set to a MacOSX SDK with a recognized version. Either set
 CMAKE_OSX_SYSROOT to a valid SDK or set CMAKE_OSX_DEPLOYMENT_TARGET
to
 empty.
 Call Stack (most recent call first):
 /Applications/CMake.app/Contents/share/cmake-3.6/Modules/CMakeSystemSpecificInformation.cmake:36
(include)
 CMakeLists.txt:37 (project)

I'm able to suppress the error by using the versioned (symlink)
directory; but isn't the premise of this error message invalid? As I
understand it, since Xcode 7 (or perhaps earlier?), there is no
requirement that the deployment target match the SDK version.

Braden


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