obsoleting shlibs - what's the plan

[Greg Troxel <gdt%ir.bbn.com@localhost>]

I just updated to 4.99.58 from 4.99.24 (!, long story, disk too small to
build).  Mostly things are working fine.

I updated using BUILD-NetBSD from etcmanage, and then ran 'postinstall
fix obsolete'.  It deleted libraries that I think it shouldn't have:

        Removed obsolete file /usr/lib/libroken.so.12.3
        Removed obsolete link /usr/lib/libroken.so.12
        Removed obsolete file /usr/lib/libkrb5.so.20.1
        Removed obsolete link /usr/lib/libkrb5.so.20
        Removed obsolete file /usr/lib/libkafs.so.7.0
        Removed obsolete link /usr/lib/libkafs.so.7
        Removed obsolete file /usr/lib/libkadm5srv.so.9.0
        Removed obsolete link /usr/lib/libkadm5srv.so.9
        Removed obsolete file /usr/lib/libkadm5clnt.so.8.0
        Removed obsolete link /usr/lib/libkadm5clnt.so.8
        Removed obsolete file /usr/lib/libhdb.so.9.0
        Removed obsolete link /usr/lib/libhdb.so.9
        Removed obsolete file /usr/lib/libgssapi.so.5.0
        Removed obsolete link /usr/lib/libgssapi.so.5
        Removed obsolete file /usr/lib/libcom_err.so.4.1
        Removed obsolete link /usr/lib/libcom_err.so.4
        Removed obsolete file /usr/lib/libasn1.so.6.1
        Removed obsolete link /usr/lib/libasn1.so.6

These are previous major versions of kerberos libraries.  My system has
even older versions (picking one):

-r--r--r--  1 root  wheel  514864 Mar 24 21:36 libkrb5.a
lrwxr-xr-x  1 root  wheel      15 Mar 24 21:39 libkrb5.so -> libkrb5.so.21.0
lrwxr-xr-x  1 root  wheel      15 Dec  2  2003 libkrb5.so.18 -> libkrb5.so.18.0
-r--r--r--  1 root  wheel  237892 Dec  2  2003 libkrb5.so.18.0
lrwxr-xr-x  1 root  wheel      15 Nov  3  2005 libkrb5.so.19 -> libkrb5.so.19.1
-r--r--r--  1 root  wheel  247545 Oct 25  2005 libkrb5.so.19.1
lrwxr-xr-x  1 root  wheel      15 Mar 24 21:39 libkrb5.so.21 -> libkrb5.so.21.0
-r--r--r--  1 root  wheel  402663 Mar 24 21:36 libkrb5.so.21.0
-r--r--r--  1 root  wheel  544664 Mar 24 21:36 libkrb5_p.a
-r--r--r--  1 root  wheel  564748 Mar 24 21:36 libkrb5_pic.a

This removal broke some of my programs:

> ldd /usr/pkg/sbin/cupsd
/usr/pkg/sbin/cupsd:
        -lgssapi.5 => not found
        -lkrb5.20 => not found
        -lasn1.6 => not found
        -ldes.7 => /usr/lib/libdes.so.7
        -lroken.12 => not found
        -lcom_err.4 => not found
        -lcrypt.0 => /usr/lib/libcrypt.so.0
        -lcrypto.3 => /usr/lib/libcrypto.so.3
        -lssl.4 => /usr/lib/libssl.so.4
        -lpthread.0 => /usr/lib/libpthread.so.0
        -lm.0 => /usr/lib/libm387.so.0
        -lm.0 => /usr/lib/libm.so.0
        -lz.1 => /usr/lib/libz.so.1
        -lcups.2 => /usr/pkg/lib/libcups.so.2
        -lresolv.1 => /usr/lib/libresolv.so.1
        -lslp.1 => /usr/pkg/lib/libslp.so.1
        -ldns_sd => /usr/pkg/lib/libdns_sd.so
        -lgssapi.5 => not found
        -lkrb5.20 => not found
        -lasn1.6 => not found
        -lroken.12 => not found
        -lcom_err.4 => not found
        -lc.12 => /usr/lib/libc.so.12


So, I think these shouldn't have been marked obsolete, and that in
general that we should not obsolete previous major shlibs, just minor
ones (e.g., if .so.3.1 arrives we can remove .so.3.0, but not .so.2.1).