illumos gate

The librtld_db directory contains a separate demo application that shows how one might use librtld_db. The way this is constructed it is always built as ancillary subdirectory that is descended into when librtld_db is being built, which follow the normal Makefile.lib style build. This demo requires not only librld_db, but it also uses libelf, libl, and liby.

librtld_db is built in two different paths. There's the normal path in cmd/sgs where it's listed as a target; however, there is a second path. It is listed as one of the items that are to be built in usr/src/lib. This means that the demo directory is built in this early phase, but it has additional dependencies that librtld_db doesn't have. The build attempts to recognize this by trying to make comments about using a native libl, liby, and libelf; however, it tries to use a proto libc and librtld_db. This ends in chaos in certain situations.

The solution here is to no longer try and build the demo in ancillary fashion and make it a top-level target in its own directory in cmd/sgs that can have all the appropriate dependencies met. At the same time, this allows us to make sure that it always builds against the proto area, which is what will be shipped.