There is a bug in golang-packaging.

My system is openSUSE 42.1 x86_64.

$ uname -a
Linux opensuse 4.1.20-11-default #1 SMP PREEMPT Fri Mar 18 14:42:07 UTC 2016
(0a392b2) x86_64 x86_64 x86_64 GNU/Linux

I have installed golang-packaging from this repository.

$ rpm -aq golang-packaging
golang-packaging-14.9.0-32.1.noarch

List the files in golang-packaging:

$ rpm -aql golang-packaging
/etc/rpm/macros.go
/usr/lib/rpm/golang
/usr/lib/rpm/golang-macros.rb
/usr/lib/rpm/golang.prov
/usr/lib/rpm/golang.req
/usr/lib/rpm/golang/cli.rb
/usr/lib/rpm/golang/filelists.rb
/usr/lib/rpm/golang/opts.rb
/usr/lib/rpm/golang/rpmsysinfo.rb
/usr/share/doc/packages/golang-packaging
/usr/share/doc/packages/golang-packaging/COPYING
/usr/share/doc/packages/golang-packaging/ChangeLog
/usr/share/doc/packages/golang-packaging/README.md

Filter word "go_arch" in file /etc/rpm/macros.go:

$ cat /etc/rpm/macros.go | grep go_arch
%go_arch    386
%go_sitearch     %{_libdir}/go/pkg/linux_%{go_arch}
%go_contribdir     %{_libdir}/go/contrib/pkg/linux_%{go_arch}
%go_tooldir        %{_datadir}/go/pkg/tool/linux_%{go_arch}

You can find out that the go_arch is 386. It should be amd64 on x86_64 system.

There is the build log for package golang-packaging on x86_64 system in
https://build.opensuse.org/package/live_build_log/devel:languages:go/golang-packaging/openSUSE_Leap_42.1/x86_64.

You can see these lines in it:

[   85s] ++ ruby ./golang-macros.rb --arch
[   85s] + GOARCH=amd64
[   85s] + sed -i s/GOARCH/amd64/ macros.go
[   85s] + exit 0