Now I see a different issue:

[   18s] cc -Wl,-z,relro -Wl,--fatal-warnings -Wl,--warn-common  -L../nondebug/libpmempool/.. -shared -Wl,--version-script=libpmempool.link,-soname,libpmempool.so.1 -o ../nondebug/libpmempool/../libpmempool.so.1.0.0 ../nondebug/libpmempool/alloc.o ../nondebug/libpmempool/badblock_ndctl.o ../nondebug/libpmempool/badblock.o ../nondebug/libpmempool/ctl.o ../nondebug/libpmempool/ctl_prefault.o ../nondebug/libpmempool/ctl_sds.o ../nondebug/libpmempool/ctl_fallocate.o ../nondebug/libpmempool/ctl_cow.o ../nondebug/libpmempool/extent_linux.o ../nondebug/libpmempool/file.o ../nondebug/libpmempool/file_posix.o ../nondebug/libpmempool/fs_posix.o ../nondebug/libpmempool/mmap.o ../nondebug/libpmempool/mmap_posix.o ../nondebug/libpmempool/os_posix.o ../nondebug/libpmempool/os_thread_posix.o ../nondebug/libpmempool/os_dimm_ndctl.o ../nondebug/libpmempool/os_deep_linux.o ../nondebug/libpmempool/out.o ../nondebug/libpmempool/pool_hdr.o ../nondebug/libpmempool/rand.o ../nondebug/libpmempool/set.o ../nondebug/libpmempool/shutdown_state.o ../nondebug/libpmempool/util.o ../nondebug/libpmempool/util_posix.o ../nondebug/libpmempool/uuid.o ../nondebug/libpmempool/uuid_linux.o ../nondebug/libpmempool/os_auto_flush_linux.o ../nondebug/libpmempool/libpmempool.o ../nondebug/libpmempool/check.o ../nondebug/libpmempool/check_bad_blocks.o ../nondebug/libpmempool/check_backup.o ../nondebug/libpmempool/check_btt_info.o ../nondebug/libpmempool/check_btt_map_flog.o ../nondebug/libpmempool/check_log.o ../nondebug/libpmempool/check_blk.o ../nondebug/libpmempool/check_pool_hdr.o ../nondebug/libpmempool/check_sds.o ../nondebug/libpmempool/check_util.o ../nondebug/libpmempool/check_write.o ../nondebug/libpmempool/pool.o ../nondebug/libpmempool/replica.o ../nondebug/libpmempool/feature.o ../nondebug/libpmempool/rpmem_common.o ../nondebug/libpmempool/rpmem_ssh.o ../nondebug/libpmempool/rpmem_cmd.o ../nondebug/libpmempool/rpmem_util.o ../nondebug/libpmempool/sync.o ../nondebug/libpmempool/transform.o ../nondebug/libpmempool/rm.o pmemblk_priv_funcs.o   -pthread -lpmem -ldl -lndctl -ldaxctl 
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/set.o: warning: multiple common of `Rpmem_persist'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/set.o: warning: multiple common of `Rpmem_remove'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/util.o: warning: multiple common of `Pagesize'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/set.o: warning: multiple common of `Rpmem_set_attr'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/mmap.o: warning: multiple common of `Mmap_no_random'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/util.o: warning: multiple common of `_Pmreorder_emit'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/set.o: warning: multiple common of `Rpmem_read'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/util.o: warning: multiple common of `_On_valgrind'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/util.o: warning: multiple common of `Mmap_align'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/mmap.o: warning: multiple common of `Mmap_hint'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/set.o: warning: multiple common of `Rpmem_deep_persist'
[   18s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: pmemblk_priv_funcs.o and ../nondebug/libpmempool/set.o: warning: multiple common of `Rpmem_close'
[   18s] objcopy --localize-hidden `sed -n 's/^	*\([a-zA-Z0-9_]*\);$/-G \1/p' libpmempool.link` ../nondebug/libpmempool/libpmempool_unscoped.o ../nondebug/libpmempool/libpmempool_all.o
[   18s] ar rv ../nondebug/libpmempool/../libpmempool.a ../nondebug/libpmempool/libpmempool_all.o
[   18s] ar: creating ../nondebug/libpmempool/../libpmempool.a
[   18s] a - ../nondebug/libpmempool/libpmempool_all.o
[   18s] collect2: error: ld returned 1 exit status
[   18s] make[2]: *** [../Makefile.inc:261: ../nondebug/libpmempool/../libpmempool.so.1.0.0] Error 1
[   18s] make[2]: Leaving directory '/home/abuild/rpmbuild/BUILD/pmdk-1.8/src/libpmempool'
[   18s] make[1]: *** [Makefile:173: libpmempool] Error 2
[   18s] make[1]: Leaving directory '/home/abuild/rpmbuild/BUILD/pmdk-1.8/src'
[   18s] make: *** [Makefile:83: all] Error 2
[   18s] error: Bad exit status from /var/tmp/rpm-tmp.UXWZDm (%build)

it's after LTO was disabled.

@Marcin: Can you please take a look?