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