Xcode 6.0 (build version 6A267n in my case) newly warns the developer if a source file is member of multiple groups/targets.
CMake, in order to work properly, adds the main source file to several targets: my_target_name, ALL_BUILD, ZERO_CHECK. Hence, I get the following warning messages.
2014-08-26 13:47:48.406 xcodebuild[14099:1007] warning: The file reference for "CMakeLists.txt" is a member of multiple groups ("ALL_BUILD" and "ZERO_CHECK"); this indicates a malformed project. Only the membership in one of the groups will be preserved (but membership in targets will be unaffected). If you want a reference to the same file in more than one group, please add another reference to the same path.
2014-08-26 13:47:48.406 xcodebuild[14099:1007] warning: The file reference for "CMakeLists.txt" is a member of multiple groups ("ZERO_CHECK" and "example"); this indicates a malformed project. Only the membership in one of the groups will be preserved (but membership in targets will be unaffected). If you want a reference to the same file in more than one group, please add another reference to the same path.
I would like to know how to resolve this warning.
The problem is reproducible with this minimal example (tested with CMake 3.0.1):
cd minimal_example_xcode6_problem
mkdir build && cd build
cmake -G Xcode ..
xcodebuild
