This file is indexed.

/usr/share/cmake-3.5/Modules/Compiler/zOS-CXX-DetermineCompiler.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(_compiler_id_pp_test "defined(__IBMCPP__) && defined(__COMPILER_VER__)")

include("${CMAKE_CURRENT_LIST_DIR}/IBMCPP-CXX-DetermineVersionInternal.cmake")