[Bug dynamic-link/30125] New: [regression, bisected] glibc-2.37 creates new symlink created in for libraries without soname

["joanbrugueram at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30125

            Bug ID: 30125
           Summary: [regression, bisected] glibc-2.37 creates new symlink
                    created in for libraries without soname
           Product: glibc
           Version: 2.37
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: joanbrugueram at gmail dot com
  Target Milestone: ---

Since installing glibc-2.37 I have noticed that `ldconfig` creates symlinks it
did not previously create for libraries without a soname.

In particular, if a library is for exmple named `libsomething.so.123.456.789`,
running `ldconfig` will now create a symlink named `libsomething.123` pointing
to `libsomething.123.456.789`, whereas previously it did not create this
symlink.

A complete reproducer is:

    #!/usr/bin/env sh
    set -eu

    rm -rf sonametest
    mkdir -p sonametest/etc sonametest/usr/lib
    gcc /dev/null -o sonametest/usr/lib/libtestsoname.so.123.456.789 -shared

    ldconfig -r sonametest
    ls -l1 sonametest/usr/lib/

Output with glibc-2.36:

    -rwxr-xr-x 1 user user 14520 11. Feb 12:34 libtestsoname.so.123.456.789

Output with glibc-2.37:

    lrwxrwxrwx 1 user user    28 11. Feb 12:34 libtestsoname.so.123 ->
libtestsoname.so.123.456.789
    -rwxr-xr-x 1 user user 14520 11. Feb 12:34 libtestsoname.so.123.456.789

I have bisected the change in behavior to commit
8ee878592c4a642937152c8308b8faef86bcfc40 "Assume only FLAG_ELF_LIBC6 suport".
It appears that the refactor in `implicit_soname` picked the wrong branch of
the `if` so `implicit_soname` now behaves always behaves as it did for libc4
libraries.

The only negative effect I have noticed from this is that unnecessary files are
created on the system.

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