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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Guix Devel , zimoun Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1643908136; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post:dkim-signature; bh=f3ef1wMqQQgNa9nhB/gaHNLVFt336hamUvAmtOQ4PC4=; b=pFqXyB2qJReQx33zQ0mIYtqP6udggbcG00l7EdLlngR0muc/xOVdSG7I1pHZ2yfGk5jz5b tUEHIVas/CYBaWQadvaiGjtVci8rkeO1uOfnNqwLHFhi+3/L+dSneGI9BPzk0AaMoxmV7D r7BBo13u1qlyWXIV1zby5uneZMct+jArfmBTVxx2gTp9y1wsHmgorgWhi+vwAcZAvc+IKl j/DoywRBIrcxjQc4JvWfnXi77IVVhPOR0DKccJrky7/k6qu2nltGbIFdE4sluauXI35Bpe KIrWWe5LZuaondZuMVtpk0UIxLKvIG+/4Db3pnasNWiAHMwN6gMVxdoMNRhbAw== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1643908136; a=rsa-sha256; cv=none; b=huriQB4Ww3LRcb8RXFRW4K8a9m7H7l2fauWaatOXl8aRCeebUbHEGwQi3xP1euhh8hm/Km spKNdPUfEj5IAPBgsRebbjES6sqf4GViM6go23bHZb6dnQHhmJ/wr+tqviY4NQB3gcGXoU w3PBkb773DAVgVfHWeNn7RJUaenlPgBpaK8WzYZeRN27yK/4mmvLUw0y73gPOcB5gIxh8I Dogwe9PB02WWdSYuxBG+ISaEmsCxXs6WumZ46vfTTY5PftW7Ec1smNfBqjSD55FPLKfFeZ X+WhojDBSHJfc8utiQNr+SJ79SiDfK1bZou4tRaC1LgO7+yRB28JEuLO+wNehg== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=fastmail.net header.s=fm2 header.b=PxDPKbnM; dkim=fail ("headers rsa verify failed") header.d=messagingengine.com header.s=fm2 header.b=HxhuJGNv; dmarc=fail reason="SPF not aligned (relaxed)" header.from=fastmail.net (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -2.63 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=fastmail.net header.s=fm2 header.b=PxDPKbnM; dkim=fail ("headers rsa verify failed") header.d=messagingengine.com header.s=fm2 header.b=HxhuJGNv; dmarc=fail reason="SPF not aligned (relaxed)" header.from=fastmail.net (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 56C452FF93 X-Spam-Score: -2.63 X-Migadu-Scanner: scn0.migadu.com X-TUID: S38PboLcja3R Hi Ricardo and Simon, Ricardo Wurmus writes: > The case of OpenBLAS is an anomaly in that this mechanism seems to > produce different binaries dependent on where it is built. When I first Thanks a lot for those explanations, I hadn't realized how peculiar OpenBLAS is! > Your problem is that the OpenBLAS build system doesn=E2=80=99t recognize = your > modern CPU. Ideally, it wouldn=E2=80=99t need to know anything about the > build-time CPU to build all the different code paths for different CPU > features. The only way around this =E2=80=94 retroactively =E2=80=94 is = to pretend to > have an older CPU, e.g. by using qemu. So all we need is a "QEMU build system" in Guix, just for OpenBLAS ;-) > The new =E2=80=9C--tune=E2=80=9D feature is supposed to take care of case= s like this. Right, I remember Ludo's blog post about this. zimoun writes: > Somehow, =E2=80=9Crecent=E2=80=9D processors cannot build old versions. That's a whole new level of planned obsolescence! Cheers, Konrad.