As mentioned in https://gcc.gnu.org/PR102426 , libtool -export-symbols-regex implementation on *-solaris* blindly assumes that Sun ld is used and uses -Wl,-M option: if test "$GCC" = yes; then wlarc='${wl}' _LT_TAGVAR(archive_cmds, $1)='$CC -shared ${wl}-z ${wl}text ${wl}-h ${wl}$soname -o $lib $libobjs $deplibs $compiler_flags' _LT_TAGVAR(archive_expsym_cmds, $1)='echo "{ global:" > $lib.exp~cat $export_symbols | $SED -e "s/\(.*\)/\1;/" >> $lib.exp~echo "local: *; };" >> $lib.exp~ $CC -shared ${wl}-z ${wl}text ${wl}-M ${wl}$lib.exp ${wl}-h ${wl}$soname -o $lib $libobjs $deplibs $compiler_flags~$RM $lib.exp' else in libtool.m4. But when GCC is configured to use GNU ld, that is wrong, for the if test "$with_gnu_ld" = yes case it needs to use (if supports_anon_versioning) -Wl,-version-script like e.g. on Linux.
I forwarded this bug to the mailing list. I looked at the different options for libtool, and it seems that bug-libtool is the one to be used (and the more likely to be checked by the new maintainer). Although, I directly asked the community to get a bit of clarification and clean-up, as there seem to be at least 3 ways to submit bugs. Thus: https://lists.gnu.org/archive/html/bug-libtool/2022-04/msg00001.html Note: Closing WONTFIX as this is not a Fedora bug, and it was only created for me to not forget to follow-up.