Installing HPX should not clobber existing Boost installation

[brycelelbach]

[reported by hkaiser] [Trac time Sun Jul 1 17:09:16 2012] Files from $HPX_ROOT/external/ should not be installed into the existing Boost installation.

[brycelelbach]

[comment by blelbach] [Trac time Tue Jul 3 00:15:41 2012] Milestone 0.9.0-rc2 deleted

[brycelelbach]

[comment by blelbach] [Trac time Fri Jul 6 14:59:19 2012] Hartmut, I'm not sure when this is a problem/how it needs to be fixed.

[hkaiser]

The problem is, that if you install HPX to the system directories and Boost is installed to the system directories as well, then all of HPX external Boost libraries end up being installed directly into the Boost installation tree, possibly overwriting the original Boost files.

[brycelelbach]

K. How should we fix this?

[hkaiser]

Just install the Boost files from HPX externals into their own subdirectory, for instance $HPX_INSTALL_ROOT/include/hpx/boost, and add this subdirectory to the include search path for compilation.