/usr/share/cmake-3.10/Modules/Compiler/GNU-CXX-DetermineCompiler.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 6 7 8 9 10 11 12 13 14 | set(_compiler_id_pp_test "defined(__GNUC__) || defined(__GNUG__)")
set(_compiler_id_version_compute "
# if defined(__GNUC__)
# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__GNUC__)
# else
# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__GNUG__)
# endif
# if defined(__GNUC_MINOR__)
# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__GNUC_MINOR__)
# endif
# if defined(__GNUC_PATCHLEVEL__)
# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__GNUC_PATCHLEVEL__)
# endif")
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