hmm, there is a reason because the special case says:
%ifarch %ix86 %arm
%if 0%{?suse_version} > 1230
ac_add_options --disable-optimize
%endif
%endif
Also there is nowhere a trace of -O3 optimization anymore. So unless someone
knows exactly where the issue is it's extremely hard to guess the correct build
flags.
It does not seem to be the same -O2 thing as it was on x86-64 at least.