[Bug 1726706] Re: Fails to build snapd on ppc64el

[Michael Hudson-Doyle]

Speaking as the golang maintainer, this is definitely a change we want,
and it's a backport from the upstream compiler that is the default in
artful. Even if binaries with TEXTREL execute correctly (which they
should) it is better to not have text relocations...

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https://bugs.launchpad.net/bugs/1726706

Title:
  Fails to build snapd on ppc64el

Status in golang-1.7 package in Ubuntu:
  Fix Released
Status in golang-1.7 source package in Zesty:
  New

Bug description:
  The builds of snapd git master (and 2.28~rc1) fail on ppc64el in zesty
  (only there) with the following error message:

  /tmp/go-build312455947/github.com/snapcore/snapd/cmd/snap-seccomp/_test/snap-seccomp.test: error while loading shared libraries: R_PPC64_ADDR16_HA re115ff6af8 for symbol `’ out of range
  exit status 127

  One full build log is here: https://launchpad.net/~snappy-
  dev/+archive/ubuntu/edge/+build/133381271

  Michael Hudson-Doyle pointed me to https://go-
  review.googlesource.com/c/go/+/33106 which is the upstream fix for
  this bug. This fix is included in the 1.8 series of golang. To unblock
  snapd in 17.04 I would like to backport/SRU the fix for golang.

  This is also a problem for other packages using go in 17.04, e.g.
  https://bugs.launchpad.net/ubuntu/+source/containerd/+bug/1711935 and
  for our users who develop on go1.7.

  [Test case]
  1. build snapd on ppc64el with golang 1.7
  2. observe that it fails to build with R_PPC64_ADDR16_HA out of range errors
  3. update to the fixed golang 1.7
  4. verify that the build works with that

  [Regression potential]
  - medium, its a change in the way the linker is called. However given that this is the default in go1.8 the risk seems ok.

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