| 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. |
