/usr/share/cmake-3.10/Modules/Compiler/Compaq-C-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 | set(_compiler_id_pp_test "defined(__DECC)")
set(_compiler_id_version_compute "
/* __DECC_VER = VVRRTPPPP */
# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__DECC_VER/10000000)
# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__DECC_VER/100000 % 100)
# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__DECC_VER % 10000)")
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