[CMake] CPACK_SET_DESTDIR

[Bill Hoffman]

Mike Arthur wrote:
> What does CPACK_SET_DESTDIR actually do? 
> 
> I can't find it documented anywhere but it seems needed for some CPack 
> generators.
> 
> CPack seems great but it's very poorly documented compared to CMake, even when 
> using the wiki.
> 
By default CPack works by setting  CMAKE_INSTALL_PREFIX to 
_CPack/install or something close to that in the build tree.  However, 
if your project uses any absolute paths, this breaks.   If you set 
CPACK_SET_DESTDIR, then CPack will not change CMAKE_INSTALL_PREFIX, and 
use make DESTDIR=_CPack/install.  This will preserve the 
CMAKE_INSTALL_PREFIX for the project and work with absolute install 
paths (like /etc/foobar.config).

-Bill