use RPATH but not RUNPATH?

Question

This page says about order for library search in ld.so:

Unless loading object has RUNPATH:     RPATH of the loading object,         then the RPATH of its loader (unless it has a RUNPATH), ...,         until the end of the chain, which is either the executable         or an object loaded by dlopen     Unless executable has RUNPATH:         RPATH of the executable LD_LIBRARY_PATH RUNPATH of the loading object ld.so.cache default dirs 

And then suggests:

When you ship binaries, either use RPATH and not RUNPATH or ensure LD_LIBRARY_PATH is set before they are run.

So, using RPATH with RUNPATH is bad because RUNPATH kind-of cancels RPATH so indirect dynamic loading doesn't work as expected? But why then RPATH got deprecated in favor of RUNPATH?

Can somebody explain the situation?

Answer 1

When you ship a binary, it's good to provide means for the users to accommodate the binary to the specifics of their own system, among other things, adjusting library search paths.

A user can generally tweak LD_LIBRARY_PATH and /etc/ld.so.conf, both of which are with lower precedence than DT_RPATH, i.e. you can't override what is hardcoded in the binary, whereas if you use DT_RUNPATH instead, a user can override it with LD_LIBRARY_PATH.

(FWIW, I think ld.so.conf should also take precedence over DT_RUNPATH, but, anyway, at least we've got LD_LIBRARY_PATH).

Also, I strongly disagree with the suggestion above to use DT_RPATH. IMO, its best to use nether DT_RPATH not DT_RUNPATH in shipped binaries.

unless

you ship all your dependent libraries with your executables and wish to ensure that things JustWork(tm) after installation, in this case use DT_RPATH.