[Python-Dev] [python-committers] Last-minute request: please backport bpo-33329 fix to 3.4 and 3.5

[Victor Stinner]

I don't think that a thread about a release is the right place to discuss a
bug. Please open an issue at bugs.python.org 😉

Victor

Le lundi 11 mars 2019, Joni Orponen <j.orponen at 4teamwork.ch> a écrit :
> On Sun, Mar 10, 2019 at 7:50 AM Larry Hastings <larry at hastings.org> wrote:
>>
>> On 3/4/19 2:29 AM, Joni Orponen wrote:
>>
>> On Sat, Mar 2, 2019 at 7:08 AM Larry Hastings <larry at hastings.org> wrote:
>>>
>>> This bug in bpo-33329:
>>>
>>> https://bugs.python.org/issue33329
>>>
>> This is also potentially affecting PGO builds of 2.7 on Debian Buster
with GCC. Somehow building with Clang is fine.
>> Does the configure time choice of compiler make a difference here for
3.4 and 3.5?
>>
>> I don't know.  I only build with the default compiler on my machine,
gcc.  (My machine is Linux, 64-bit.)  It'd be swell if you tried the RCs
with clang!
>>
>> /arry
>
> I've only risen this as a newer glibc was implicated as a potential
source of trouble, I have a lab / 'canary in a coal mine' server on a
prerelease OS version (Debian Buster is currently in feature freeze ~
release candidate stage) and I've not noticed anything to have happened
with a newer glibc in relation to building Python, but I've not had success
building a PGO build of 2.7.15 with the GCC shipped at that time, but
building with Clang working fine.
> I'd thus be inclined to point at digging up relevant changes in GCC than
in glibc. Currently 2.7.16 compiles just fine for me on both GCC and Clang.
2.7.15 still does not compile fine for me on GCC.
> FWIW - both Python 3 RCs from above successfully complete a PGO build for
me (and thus implicitly also pass the regression tests) with Clang. They
both get stuck with GCC.
> $ cat /etc/debian_version
> buster/sid
> $ aptitude show base-files
> Package: base-files
> Version: 10.1
> Essential: yes
> State: installed
> $ aptitude show libc6
> Package: libc6
> Version: 2.28-8
> State: installed
> $ aptitude show clang
> Package: clang
> Version: 1:7.0-47
> State: installed
> $ clang --version
> clang version 7.0.1-8 (tags/RELEASE_701/final)
> Target: x86_64-pc-linux-gnu
> Thread model: posix
> InstalledDir: /usr/bin
> $ aptitude show gcc
> Package: gcc
> Version: 4:8.3.0-1
> State: installed
> $ gcc --version
> gcc (Debian 8.3.0-2) 8.3.0
> And for anyone wishing to try such things out for themselves, one can
simply set the CC environment variable for the autotools provided
./configure script.
> See ./configure --help for any further details and instructions.
> --
> Joni Orponen

-- 
Night gathers, and now my watch begins. It shall not end until my death.
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