Comment # 3 on bug 1177140 from Michel Normand

Created attachment 842166 [details]
openssh_openSUSE_Tumbleweed____x86_64_202010011514.log.gz

I confirm that failure was masked by lto enable for x86_64 or ppc64le as per
last trial in my branch where I voluntarily forced %define _lto_cflags %{nil}

attached x86_64 log has same original failure of ppc64:
===
[  125s] cc -o sftp-server sftp-common.o sftp-server.o sftp-server-main.o -L.
-Lopenbsd-compat/ -pie -Wl,--as-needed -Wl,-z,relro -Wl,-z,now
-Wl,-z,noexecstack -fstack-protector-strong -pie  -lssh -lopenbsd-compat
-lcrypto -ldl -lldap -llber -lutil -lz  -lcrypt -lresolv
[  125s]
/usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld:
./libssh.a(sshkey.o): in function `sshkey_sign':
[  125s] /home/abuild/rpmbuild/BUILD/openssh-8.3p1/sshkey.c:2799: undefined
reference to `sshsk_sign'
===