------- Comment From [email protected] 2018-08-01 09:45 EDT-------
Current versions of OpenStack, e.g. Queens [1], require at least greenlet 
0.4.10, so the 0.4.9 version that is the latest currently packaged for Ubuntu 
16.04 is insufficient. Therefore, in order to run OpenStack's devstack project 
on Ubuntu 16.04, which is commonly done in OpenStack development and in 
OpenStack CI (continuous integration) automation, greenlet has to be pip 
installed, which fails with this issue because pip install will pull the latest 
release by default.

But let's step back for a minute. Top priority here should be to
determine whether this is really a gcc bug or a greenlet bug. Does
Ubuntu agree with the greenlet community that this is a gcc bug? At
least one greenlet contributor that I spoke to did not agree with that
assessment, so I don't think this is a given. And I was still able to
reproduce this bug after upgrading gcc-5, installing gcc-6, installing
gcc-7, and installing gcc-8 from the toolchain test builds PPA.

If this is a greenlet bug, then it needs to be fixed by the greenlet
community regardless of any Ubuntu versioning/packaging, and we'll all
be better off determining that sooner rather than later.

On the other hand, if it is a gcc bug, then it would presumably affect
other things besides greenlet, so that risk would need to be assessed
and balanced against the risk of patching gcc on Ubuntu 16.04.

I have not tested this on Ubuntu 18.04, so I cannot say whether the same
issue exists there or not.

[1] https://github.com/openstack/requirements/blob/stable/queens/global-
requirements.txt#L73

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https://bugs.launchpad.net/bugs/1783252

Title:
  greenlet 0.4.14 will not build on ppc64le

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