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K.) To: Konrad Hinsen Subject: Re: Reproducible Research Hackathon: Friday, July 3rd References: <86fta8cyna.fsf@gmail.com> <875zarr0pk.fsf@gnu.org> Date: Tue, 14 Jul 2020 11:54:39 +0300 In-Reply-To: (Konrad Hinsen's message of "Tue, 14 Jul 2020 10:13:59 +0200") Message-ID: <86tuyaeasw.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=bonfacemunyoki@gmail.com; helo=mail-wm1-x333.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: guix-devel@gnu.org, Ludovic =?utf-8?Q?Court=C3=A8s?= , simon tournier , guix-hpc@gnu.org Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Scanner: scn0 Authentication-Results: aspmx1.migadu.com; dkim=fail (rsa verify failed) header.d=gmail.com header.s=20161025 header.b=dtEtLyNx; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Spam-Score: 0.09 X-TUID: 17mYBUTufV5U Konrad Hinsen writes: > Hi Ludo, > >> Apologies for the delay. What was this bug exactly? >> >> I know Bonface addressed an issue related to how the Python 2.4 build >> system would capture the kernel version via =E2=80=98uname=E2=80=99 a bu= ild time: >> >> https://gitlab.inria.fr/guix-hpc/guix-past/-/commit/d1977f5dccd73341f3= 63cfa8d58ae3f2b2700ad7 >> >> But presumably you=E2=80=99re referring to something else, right? > > Indeed. The details are here: > > https://gitlab.inria.fr/guix-hpc/guix-past/-/issues/1 > > Since I won't be able to look into this before my summer vacations, > I opened an issue as a reminder. > > Cheers, > Konrad > That's strange. To get the right results, you'd have to do a `2L ** 64`. When I tried `2 ** 63` I got `-9223372036854775808`. There's also an overflow error. Here's a snippet of what fails from Python-2.4.6/Lib/test: ``` # If this fails, probably using a strict IEEE-754 conforming libm, and x # is +Inf afterwards. But Python wants overflows detected by default. try: x =3D math.exp(1000000000) except OverflowError: pass else: raise TestFailed("overflowing exp() didn't trigger OverflowError") ``` Maybe there's an overflow somewhere and we'd have to tweak libm? I'm speculating though. I'd have to investigate this later. --=20 Bonface M. K. (https://www.bonfacemunyoki.com) One Divine Emacs To Rule Them All GPG key =3D D4F09EB110177E03C28E2FE1F5BBAE1E0392253F