Hi Ville,

thanks for reporting. I have noticed I was deleting _build directory in %install section which resulted in cpio warnings/errors as there was no _build.

$ rpm -qpl golang-github-docker-libcontainer-debuginfo-2.1.1-0.1.gitc964368.fc23.x86_64.rpm
/usr/lib/debug
/usr/lib/debug/.build-id
/usr/lib/debug/.build-id/22
/usr/lib/debug/.build-id/22/0eb604dae10a6ae92c1bfc9cb20c4198aa3466
/usr/lib/debug/.build-id/22/0eb604dae10a6ae92c1bfc9cb20c4198aa3466.debug
/usr/lib/debug/usr
/usr/lib/debug/usr/bin
/usr/lib/debug/usr/bin/nsinit.debug

$ rpm -qpl golang-github-docker-libcontainer-debuginfo-2.1.1-0.2.gitc964368.fc23.x86_64.rpm
/usr/lib/debug
/usr/lib/debug/.build-id
/usr/lib/debug/.build-id/a2
/usr/lib/debug/.build-id/a2/db4f8dcd2c0faa6bc1543851869cc969ba187b
/usr/lib/debug/.build-id/a2/db4f8dcd2c0faa6bc1543851869cc969ba187b.debug
/usr/lib/debug/usr
/usr/lib/debug/usr/bin
/usr/lib/debug/usr/bin/nsinit.debug
/usr/src/debug/libcontainer-c9643688cb73c2588a9c9b14357bda6c3a9df67f
/usr/src/debug/libcontainer-c9643688cb73c2588a9c9b14357bda6c3a9df67f/_build
/usr/src/debug/libcontainer-c9643688cb73c2588a9c9b14357bda6c3a9df67f/_build/src
/usr/src/debug/libcontainer-c9643688cb73c2588a9c9b14357bda6c3a9df67f/_build/src/github.com
/usr/src/debug/libcontainer-c9643688cb73c2588a9c9b14357bda6c3a9df67f/_build/src/github.com/docker
/usr/src/debug/libcontainer-c9643688cb73c2588a9c9b14357bda6c3a9df67f/_build/src/github.com/docker/libcontainer
...

Jan

golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc22 has been submitted as an update for Fedora 22.
https://admin.fedoraproject.org/updates/golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc22

golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc21

golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc20

Looks like this one is still not built with $RPM_OPT_FLAGS though (again, see the gcc invocations in the build log). If that's on purpose, rationale for that should be documented in the specfile.

Is it even possible to set $RPM_OPT_FLAGS for golang compiler? Primary architectures use golang, not gcc-go.

'go build -h' gives you among others:
	-ccflags 'arg list'
		arguments to pass on each 5c, 6c, or 8c compiler invocation.
	-gcflags 'arg list'
		arguments to pass on each 5g, 6g, or 8g compiler invocation.

Running go build with -gcflags "$RPM_OPT_FLAGS" fails on:
/usr/lib/golang/pkg/tool/linux_amd64/6g: unknown flag -O2
/usr/lib/golang/pkg/tool/linux_amd64/6g: unknown flag -pipe
/usr/lib/golang/pkg/tool/linux_amd64/6g: unknown flag -Wall
...

I don't know. If not, maybe a patch to use the desired flags is needed somewhere.

Vincent, is it possible to set flags for gcc compiler when 'go build' is run? Or does golang compiler has its own compiler which uses gcc with predefined set of flags? From build.log I can see 'go build' uses combination of /usr/lib/golang/pkg/tool/linux_amd64/6g, /usr/lib/golang/pkg/tool/linux_amd64/6c and gcc.

The golang compiler is completely and totally different than the gcc compiler. One does not in ANY way use the other. There is a golang compiler as part of gcc (gcc-go) but we are not using it for a variety of reasons.

I do not think passing standard gcc compiler flags to the golang compiler will ever work well.

We'd have to dig into the build scripts to figure out who/why something is trying to build .c files here. All this cgo stuff...

Package golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc21:
* should fix your issue,
* was pushed to the Fedora 21 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc21'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2015-10020/golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc21
then log in and leave karma (feedback).

golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

golang-github-docker-libcontainer-2.1.1-0.2.gitc964368.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.