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CPACK_SET_DESTDIR
-----------------
Boolean toggle to make CPack use ``DESTDIR`` mechanism when packaging.
``DESTDIR`` means DESTination DIRectory. It is commonly used by makefile
users in order to install software at non-default location. It is a
basic relocation mechanism that should not be used on Windows (see
:variable:`CMAKE_INSTALL_PREFIX` documentation). It is usually invoked like
this:
::
make DESTDIR=/home/john install
which will install the concerned software using the installation
prefix, e.g. ``/usr/local`` prepended with the ``DESTDIR`` value which
finally gives ``/home/john/usr/local``. When preparing a package, CPack
first installs the items to be packaged in a local (to the build tree)
directory by using the same ``DESTDIR`` mechanism. Nevertheless, if
``CPACK_SET_DESTDIR`` is set then CPack will set ``DESTDIR`` before doing the
local install. The most noticeable difference is that without
``CPACK_SET_DESTDIR``, CPack uses :variable:`CPACK_PACKAGING_INSTALL_PREFIX`
as a prefix whereas with ``CPACK_SET_DESTDIR`` set, CPack will use
:variable:`CMAKE_INSTALL_PREFIX` as a prefix.
Manually setting ``CPACK_SET_DESTDIR`` may help (or simply be necessary)
if some install rules uses absolute ``DESTINATION`` (see CMake
:command:`install` command). However, starting with CPack/CMake 2.8.3 RPM
and DEB installers tries to handle ``DESTDIR`` automatically so that it is
seldom necessary for the user to set it.
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