This file is indexed.

/usr/share/cmake-3.5/Modules/Compiler/AppleClang-C-FeatureTests.cmake is in cmake-data 3.5.1-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 400")

set(AppleClang_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
set(_cmake_feature_test_c_static_assert "${AppleClang_C11}")
set(AppleClang_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
set(_cmake_feature_test_c_restrict "${AppleClang_C99}")
set(_cmake_feature_test_c_variadic_macros "${AppleClang_C99}")

set(AppleClang_C90 "${_cmake_oldestSupported}")
set(_cmake_feature_test_c_function_prototypes "${AppleClang_C90}")