[Bug 1794936] Re: new gccgo version update (4:8.2.0-1ubuntu2.1) is triggering dh-golang <1.35 bug

[Michael Vogt]

I am much in favour of stop supporting powerpc in snapd. If we can make
that official in the SRU page we have one worry less (in practical terms
powerpc was never really fully supported because we don't build a core
snap for powerpc).

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Title:
  new gccgo version update (4:8.2.0-1ubuntu2.1)  is triggering dh-golang
  <1.35 bug

Status in dh-golang package in Ubuntu:
  New
Status in gcc-8 package in Ubuntu:
  New

Bug description:
  We see this kind of error in recent runs of snapd tests when using
  bionic updating gccgo 4:8.2.0-1ubuntu2.1 and current dh-golang 1.34.

  Can be run  from snapd master checkout with:

  spread -v -debug google:ubuntu-18.04-64:tests/unit/gccgo

  with the proper configuration.

  Error:

  ...
    dh_makeshlibs -O--buildsystem=golang -O--fail-missing -O--builddirectory=_build
     dh_shlibdeps -O--buildsystem=golang -O--fail-missing -O--builddirectory=_build
     debian/rules override_dh_installdeb
  make[1]: Entering directory '/home/gopath/src/github.com/snapcore/snapd'
  dh_apparmor --profile-name=usr.lib.snapd.snap-confine.real -psnapd
  dh_installdeb
  make[1]: Leaving directory '/home/gopath/src/github.com/snapcore/snapd'
     dh_golang -O--buildsystem=golang -O--fail-missing -O--builddirectory=_build
  template: main:2:14: executing "main" at <index (or .GoFiles ....>: error calling index: index out of range: 0
  dh_golang: go list -f '\
  {{ .Dir }}/{{ index (or .GoFiles .CgoFiles .TestGoFiles .XTestGoFiles .IgnoredGoFiles) 0 }}' returned exit code 1
  debian/rules:103: recipe for target 'binary' failed
  make: *** [binary] Error 1
  dpkg-buildpackage: error: fakeroot debian/rules binary subprocess returned exit status 2
  -----

  These were passing until today.

  Seems related/similar to https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=907263

  which mentions dh-golang 1.35 having a fix.

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