The glibc dynamic linker currently prevents moving a symbol from one soname to another if the symbol is versioned. This is an artifact of the way symbol-specific versioning is implemented in glibc. There is no fundamental technical reason to disallow this, and glibc 2.30 upstream lifts this restriction.
Author: Florian Weimer <firstname.lastname@example.org>
Date: Fri Jun 28 10:12:50 2019 +0200
ld.so: Support moving versioned symbols between sonames [BZ #24741]
This change should be fully backwards-compatible because the old
code aborted the load if a soname mismatch was encountered
(instead of searching further for a matching symbol). This means
that no different symbols are found.
The soname check was explicitly disabled for the skip_map != NULL
case. However, this only happens with dl(v)sym and RTLD_NEXT,
and those lookups do not come with a verneed entry that could be used
for the check.
The error check was already explicitly disabled for the skip_map !=
NULL case, that is, when dl(v)sym was called with RTLD_NEXT. But
_dl_vsym always sets filename in the struct r_found_version argument
to NULL, so the check was not active anyway. This means that
symbol lookup results for the skip_map != NULL case do not change,
*** This bug has been marked as a duplicate of bug 1764231 ***