I think I get it all now.....
https://github.com/python-
greenlet/greenlet/commit/9c8a65fddcffe161f38679a0b3289de9b25e2bc6.patch
-> unbreaks with new gcc-7, but broken again with old gcc-5 again
And hence you are stuck between a rock and a hard-place.... either hack-
up a Frankenstein toolchain or somehow revert future-proof correct
upstream code, for sake of older buggy gcc.
I wonder if greenlet could somehow detect buggy compiler and still build
with it... 😂
** Also affects: python-greenlet (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: gcc-5 (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: gcc-5 (Ubuntu Xenial)
Status: New => Triaged
** Changed in: gcc-5 (Ubuntu Xenial)
Importance: Undecided => High
** Changed in: gcc-5 (Ubuntu Xenial)
Importance: High => Wishlist
** Changed in: gcc-5 (Ubuntu)
Status: Incomplete => Won't Fix
** No longer affects: python-greenlet (Ubuntu Xenial)
** Description changed:
+ [Impact]
+
+ * GCC has a minor bug w.r.t. clobber r30 register in PIC binaries.
+ * A patch to fix this has been upstream in 6+
+ * But it is not in gcc-5.4 as used on xenial
+ * This prevents compiling future-proof and correct greenlet code, on Ubuntu
16.04 LTS as used by current and supported Openstack Queens release on ppc64el
+ * Whilst backported greenlet is available via the cloud archive for binary
usage, the toolchain is still technically incorrect, and thus hinders using
Ubuntu 16.04 LTS as workers in upstream Openstack CI
+ * As a wishlist it would be nice to backport this one small gcc patch as an
SRU
+
+ [Test Case]
+
+ * git clone https://github.com/python-greenlet/greenlet
+ * cd greenlet
+ * ./setup.py build
+ Expect success
+
+ Current result failure:
+
+ 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
+
+
+ [Regression Potential]
+
+ * Upstream cherrypick present in later releases including bionic
+
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=9213244550335bcb2b8590a0d7d58ac74c932361
+
+
+ [Other Info]
+
+ * Original bug report
+
+
== Comment: #0 - William M. Edmonds <[email protected]> - 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```
+ 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.
-
+ 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
-
+
+ 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 / [email protected]
-
- Userspace tool common name: greenlet
-
- The userspace tool has the following bit modes: no idea
+
+ Contact Information = Matthew Edmonds / [email protected]
+
+ 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
-
+ Userspace tool obtained from project website: 0.4.14
+
*Additional Instructions for Matthew Edmonds / [email protected]:
-Attach ltrace and strace of userspace application.
** Summary changed:
- greenlet 0.4.14 will not build on ppc64le
+ gcc on ppc64le has bogus r30 register handling, as exposed by greenlet 0.4.14
will not build on ppc64le
** Changed in: gcc-5 (Ubuntu)
Status: Won't Fix => Fix Released
** Changed in: gcc-5 (Ubuntu)
Status: Fix Released => Won't Fix
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https://bugs.launchpad.net/bugs/1783252
Title:
gcc on ppc64le has bogus r30 register handling, as exposed by greenlet
0.4.14 will not build on ppc64le
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