** Changed in: gzip (Ubuntu Plucky)
     Assignee: (unassigned) => Andreas Hasenack (ahasenack)

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

** Changed in: gzip (Ubuntu Plucky)
   Importance: Undecided => High

** Summary changed:

- dfltcc.c FTBFS on s390x
+ [FFe]: re-enable DFLTCC on s390x

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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:
  In Progress
Status in gzip source package in Plucky:
  In Progress

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 two fold:
  - 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, 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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