Comment # 9 on bug 893418 from Richard Biener

Fixed.  For Tumbleweed, that is, since GCC 6.

# Enable plugins just for Tumbleweed, not for SLE13
%if %{suse_version} == 1330
%define enable_plugins 1
%else
%define enable_plugins 0
%endif

you need to install gcc-devel for this.