/usr/share/cmake-3.10/Modules/Compiler/IBMCPP-CXX-DetermineVersionInternal.cmake is in cmake-data 3.10.2-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | set(_compiler_id_version_compute "
/* __IBMCPP__ = VRP */
# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__IBMCPP__/100)
# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__IBMCPP__/10 % 10)
# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__IBMCPP__ % 10)")
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