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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
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 CPACK_PACKAGING_INSTALL_PREFIX as a
prefix whereas with CPACK_SET_DESTDIR set, CPack will use
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 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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