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charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-Spam-Score: -1.0 (-) X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 43843@debbugs.gnu.org Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Scanner: scn0 Authentication-Results: aspmx1.migadu.com; dkim=fail (rsa verify failed) header.d=gmail.com header.s=20161025 header.b=W+zhgdCu; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Spam-Score: 0.09 X-TUID: LKVmOfFz80R6 On Mon, 12 Oct 2020 at 12:34, Ricardo Wurmus wrote: > > Does the parallel build save a lot of time and CPU? If yes, maybe we > > could to provide a transformation for the expert, something like > > "haskell-build-system-with-parellel-build" which tweaks > > "PARALLEL-BUILD?", similarly to the recent "no tests". WDYT? > > We shouldn=E2=80=99t compromise reproducibility for parallel builds. Ide= ally we > would figure out what exactly causes the differences and fix that > instead of disabling parallel builds, but if that turns out to be too > difficult I think we should just revert this until we have a good fix. > > Perhaps something can be done by fixing the order of files somewhere. My proposal is for the expert and not at the CLI level. Something like "(funky-name ghc-foo)" which returns a new package with PARALLEL-BUILD? turned to #t. And the default should be #f. WDYT? Well, I am going to try to rebuild the packages with #f and see if it fixes the ~300 unreproducible packages. Cheers, simon