Comment # 15 on bug 1191473 from Jan Engelhardt

>the final linker command contains "-Wl,-rpath,::::::::::" for all architectures on TW. CMake adds this option to have a sufficiently large RUNPATH string entry (containing only padding from a semantic view point) which can be overwritten during install.

If only cmake knew how to run chrpath, then such hack wouldn't be needed.
Speaking of which, ld maybe should also just collapse empty paths.