[Bug 1783252] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From wschmidt at us.ibm.com 2018-08-01 15:42 EDT-------
I'm not the port maintainer, just the architect for IBM's contributions to the Power port.  CCing the maintainer here.  However, the maintainer being aware of the patch doesn't buy you a whole lot.  The only question is whether the Canonical toolchain team is comfortable carrying the patch.

-- 
You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to python-greenlet in Ubuntu.
https://bugs.launchpad.net/bugs/1783252

Title:
  greenlet 0.4.14 will not build on ppc64le

Status in The Ubuntu-power-systems project:
  Won't Fix
Status in gcc-5 package in Ubuntu:
  Incomplete
Status in python-greenlet package in Ubuntu:
  Fix Released

Bug description:
  == Comment: #0 - William M. Edmonds <edmondsw at us.ibm.com> - 2018-07-23 16:21:41 ==
  ---Problem Description---
  greenlet 0.4.14 will not build on ppc64le

  Opened https://github.com/python-greenlet/greenlet/issues/136 because
  attempting to build bdist_wheel for greenlet 0.4.14 on ppc64le Ubuntu
  16.04 LTS yields the following error:

  running build
  running build_ext
  building 'greenlet' extension
  creating build
  creating build/temp.linux-ppc64le-2.7
  powerpc64le-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c greenlet.c -o build/temp.linux-ppc64le-2.7/greenlet.o -fno-tree-dominator-opts
  In file included from slp_platformselect.h:16:0,
                      from greenlet.c:343:
     platform/switch_ppc64_linux.h: In function 'slp_switch':
     platform/switch_ppc64_linux.h:80:5: error: PIC register clobbered by 'r30' in 'asm'
          __asm__ volatile ("" : : : REGS_TO_SAVE);
          ^
     platform/switch_ppc64_linux.h:95:5: error: PIC register clobbered by 'r30' in 'asm'
          __asm__ volatile ("" : : : REGS_TO_SAVE);
          ^
     error: command 'powerpc64le-linux-gnu-gcc' failed with exit status 1```

  But the greenlet community is saying this is a gcc bug and it would not be safe to revert the greenlet change that exposed this issue. I have no idea whether that is true or not. Supposedly this should be fixed by https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=9213244550335bcb2b8590a0d7d58ac74c932361 but that fix is not present in the latest version of gcc (5.4.0) available for Ubuntu 16.04 LTS.
   
  ---uname output---
  unavailable due to lab outage
   
  Machine Type = unavailable due to lab outage 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
  This should be reproducible with `git clone git://github.com/python-greenlet/greenlet; cd greenlet; python setup.py bdist_wheel`, though it was originally found using pypi rather than github and with a more complicated (scripted) command as detailed in the greenlet bug description.
   
  Contact Information = Matthew Edmonds / edmondsw at us.ibm.com 
   
  Userspace tool common name: greenlet 
   
  The userspace tool has the following bit modes: no idea 

  Userspace rpm: N/A

  Userspace tool obtained from project website:  0.4.14 
   
  *Additional Instructions for Matthew Edmonds / edmondsw at us.ibm.com:
  -Attach ltrace and strace of userspace application.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1783252/+subscriptions