[{"id":35527,"web_url":"https://patchwork.libcamera.org/comment/35527/","msgid":"<2552d788-8d67-479d-9f0a-3edb46aba7c3@ideasonboard.com>","date":"2025-08-20T09:58:27","subject":"Re: [PATCH v3 0/3] py: Improve native and cross-compilation of\n\tPython bindings","submitter":{"id":109,"url":"https://patchwork.libcamera.org/api/people/109/","name":"Tomi Valkeinen","email":"tomi.valkeinen@ideasonboard.com"},"content":"Hi,\n\nOn 19/08/2025 04:23, Laurent Pinchart wrote:\n> Hello,\n> \n> This patch series resurects an old patch from William ([1]) that fixes\n> the installation path of Python bindings on Debian when compiling\n> libcamera natively. I've stumbled upon a similar issue on Gentoo, which\n> pushed me to investigate how meson handles Python extension modules, and\n> how Debian implements \"original\" and \"clever\" very unconventional\n> conventions for installation paths. The result of that investigation is\n> summarized in a reply to [1], I will not duplicate it here.\n> \n> Patch 1/3 is a rebased version of William's patch. The next two patches\n> are new, they attempt to also improve cross-compilation by using the\n> meson python module to locate the Python dependency (2/3) and calculate\n> the installation path (3/3). Please see individual patches for details\n> of the pros and cons.\n> \n> I have tested this series with native compilation on Debian 11, 12 and\n> 13 as well as on Gentoo, and cross-compilation using Debian 12\n> multiarch as well manually compiling libcamera against a Buildroot\n> environment. All three patches bring in my opinion a net improvement,\n> even if cross-compilation on Debian 12 required specifying the\n> installation path manually.\n> \n> [1] https://patchwork.libcamera.org/patch/19186/\n> \n> Laurent Pinchart (2):\n> py: libcamera: Get dependency from meson python module unconditionally\n> py: libcamera: Always use install path from meson python module\n> \n> William Vinnicombe (1):\n> py: libcamera: Improve python binding installation\n> \n> src/py/libcamera/meson.build | 41 ++++++++++++++++++++++++------------\n> src/py/meson.build | 5 +++--\n> test/py/meson.build | 3 ---\n> 3 files changed, 30 insertions(+), 19 deletions(-)\n> \n> \n> base-commit: af43c2f945c42cc7d111de63abed9ca3df830ca4\n> prerequisite-patch-id: 1298ff340024778a333472d63b8bf28c618ccad7\n> prerequisite-patch-id: 1967c9e8fb4ab43fc8b1fe9784737a36bc882076\n> prerequisite-patch-id: dd4ee79a61e075a5e2037b9aae68938d008f92dd\n> prerequisite-patch-id: c3106cd30df87783fcdb30b84402d0ba232baf0e\n> --\n> Regards,\n> \n> Laurent Pinchart\n> \n\nI've tested this, and while I have only compile tested, everything seems\nto go right. I did upgrade my buildroot so that I got different py\nversions for my OS and my buildroot, still worked fine =).\n\nFor the series:\n\nReviewed-by: Tomi Valkeinen \n\n Tomi","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 0C120BEFBE\n\tfor ;\n\tWed, 20 Aug 2025 09:58:33 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 4F569692D7;\n\tWed, 20 Aug 2025 11:58:32 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 261D5613C5\n\tfor ;\n\tWed, 20 Aug 2025 11:58:30 +0200 (CEST)","from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi\n\t[91.158.153.178])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 527D2606;\n\tWed, 20 Aug 2025 11:57:31 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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