[Bug 2100598] Re: [FFe]: re-enable DFLTCC on s390x

[Utkarsh Gupta]

Thank you, Andreas. Given it was already there, I think it's perfectly
fine to re-enable it - also given that we're still in the early phase.
Consider this FFe granted but please upload this at the earliest so that
we have more time to see if there are any other bugs/FTBFS/etc around
this. Thanks.

** Changed in: gzip (Ubuntu Plucky)
       Status: In Progress => Triaged

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https://bugs.launchpad.net/bugs/2100598

Title:
  [FFe]: re-enable DFLTCC on s390x

Status in Ubuntu on IBM z Systems:
  New
Status in gzip package in Ubuntu:
  Triaged
Status in gzip source package in Plucky:
  Triaged

Bug description:
  DFLTCC on s390x is a feature that was disabled to address an FTBFS in
  that code. This was done before feature freeze in [1].

  We later found out the real fix[2] for the FTBFS, and it's in an MP attached to this bug. The diff is twofold:
  - a revert of [1]
  - this change:
  --- a/debian/rules
  +++ b/debian/rules
  @@ -31,8 +31,12 @@ ifeq ($(buildarch), amd64)
   DEB_CPPFLAGS_MAINT_APPEND := -DUNALIGNED_OK
   endif

  +# For why -Dalignas, see:
  +# https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66709#10
  +# and
  +# LP: #2100598
   ifeq (${DEB_HOST_ARCH},s390x)
  -DEB_CPPFLAGS_MAINT_APPEND := -DDFLTCC -DDFLTCC_LEVEL_MASK=0x7e
  +DEB_CPPFLAGS_MAINT_APPEND := -DDFLTCC -DDFLTCC_LEVEL_MASK=0x7e -Dalignas=_Alignas
   endif

   # Automatic dpkg-buildflags selection, backport-friendly

  PPA[3] with that fix, showing an s390x and amd64 builds.
  DEP8 tests will be run after the PPA publishes, but they are rather trivial.

  This feature was disabled by mistake, one could say, and is now being
  re-enabled. Still, it's a change in behavior post FF, for just s390x,
  and warrants an FFe request.

  1. https://launchpad.net/ubuntu/+source/gzip/1.13-1ubuntu2
  2. https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66709#10
  3. https://launchpad.net/~ahasenack/+archive/ubuntu/gzip-sigill/

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