toolchain/55564: private libs broken?

[martin%NetBSD.org@localhost]

>Number:         55564
>Category:       toolchain
>Synopsis:       private libs broken?
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 12 18:45:00 +0000 2020
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.70
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD thirdstage.duskware.de 9.99.70 NetBSD 9.99.70 (MODULAR) #363: Wed Aug 12 11:53:26 CEST 2020 martin%thirdstage.duskware.de@localhost:/usr/src/sys/arch/sparc64/compile/MODULAR sparc64
Architecture: sparc64
Machine: sparc64
>Description:

The rump/rumpkern/t_vm test program (just a random example I noticed) uses
the private "kernspace" lib from src/tests/rump/kernspace (which has
LIBISPRIVATE= in the Makefile).

This lib (as intended) does not install a .so anywhere, but for some reason
it is linked as shared object into t_vm:

> ldd /usr/tests/rump/rumpkern/t_vm 
t_vm:
        -lrumpvfs.0 => /usr/lib/librumpvfs.so.0
        -lrump.0 => /usr/lib/librump.so.0
        -lrumpuser.0 => /usr/lib/librumpuser.so.0
        -lpthread.1 => /usr/lib/libpthread.so.1
        -lc.12 => /usr/lib/libc.so.12
        -lrumpvfs_nofifofs.0 => /usr/lib/librumpvfs_nofifofs.so.0
        -lkernspace.0 => not found
        -latf-c.0 => /usr/lib/libatf-c.so.0


>How-To-Repeat:
s/a

>Fix:
n/a