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CMAKE_USER_MAKE_RULES_OVERRIDE
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------------------------------
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Specify a CMake file that overrides platform information.
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CMake loads the specified file while enabling support for each
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language from either the :command:`project` or :command:`enable_language`
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commands. It is loaded after CMake's builtin compiler and platform information
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modules have been loaded but before the information is used. The file
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may set platform information variables to override CMake's defaults.
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This feature is intended for use only in overriding information
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variables that must be set before CMake builds its first test project
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to check that the compiler for a language works. It should not be
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used to load a file in cases that a normal :command:`include` will work. Use
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it only as a last resort for behavior that cannot be achieved any
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other way. For example, one may set ``CMAKE_C_FLAGS_INIT`` to change the
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default value used to initialize :variable:`CMAKE_C_FLAGS <CMAKE_<LANG>_FLAGS>`
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before it is cached. The override file should NOT be used to set anything
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that could be set after languages are enabled, such as variables like
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:variable:`CMAKE_RUNTIME_OUTPUT_DIRECTORY` that affect the placement of
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binaries. Information set in the file will be used for :command:`try_compile`
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and :command:`try_run` builds too.
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