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- Use target_compile_features() to specify the C++11 dependency for Ceres if the CXX11 option is enabled and the current CMake version supports it (>= 3.1). Otherwise fall back onto our existing target_compile_options() solution if available. - We prefer the use of target_compile_features() if available as it more gracefully handles ‘upgrading’ of the C++ standard in client projects that depend upon Ceres, e.g. if the client requires C++14. The current solution may fail to produce the expected result in this case as raised in https://github.com/ceres-solver/ceres-solver/issues/273. Change-Id: Ib3cff8d4b9fe93fa6d6b376b4dd53923bb1c4ecc