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CPACK_CUSTOM_INSTALL_VARIABLES.rst
CPACK_CUSTOM_INSTALL_VARIABLES ------------------------------ .. versionadded:: 3.21 CPack variables (set via e.g. :option:`cpack -D`, ``CPackConfig.cmake`` or :variable:`CPACK_PROJECT_CONFIG_FILE` scripts) are not directly visible in installation scripts. Instead, one can pass a list of ``varName=value`` pairs in the ``CPACK_CUSTOM_INSTALL_VARIABLES`` variable. At install time, each list item will result in a variable of the specified name (``varName``) being set to the given ``value``. The ``=`` can be omitted for an empty ``value``. ``CPACK_CUSTOM_INSTALL_VARIABLES`` allows the packaging installation to be influenced by the user or driving script at CPack runtime without having to regenerate the install scripts. Example """"""" .. code-block:: cmake install(FILES large.txt DESTINATION data) install(CODE [[ if(ENABLE_COMPRESSION) # "run-compressor" is a fictional tool that produces # large.txt.xz from large.txt and then removes the input file execute_process(COMMAND run-compressor $ENV{DESTDIR}${CMAKE_INSTALL_PREFIX}/large.txt) endif() ]]) With the above example snippet, :manual:`cpack <cpack(1)>` will by default run the installation script with ``ENABLE_COMPRESSION`` unset, resulting in a package containing the uncompressed ``large.txt``. This can be overridden when invoking :manual:`cpack <cpack(1)>` like so: .. code-block:: shell cpack -D "CPACK_CUSTOM_INSTALL_VARIABLES=ENABLE_COMPRESSION=TRUE" The installation script will then run with ``ENABLE_COMPRESSION`` set to ``TRUE``, resulting in a package containing the compressed ``large.txt.xz`` instead.