From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Tue, 14 Jul 2020 15:51:02 +0200 Subject: [Buildroot] [PATCH] package/scons: explicitly specify host Python 3 In-Reply-To: <17dc14ac-1f7f-ef67-84af-e41241ffe86a@railnova.eu> References: <20200714033927.1516172-1-hancock@sedsystems.ca> <20200714101510.378d1909@windsurf.home> <17dc14ac-1f7f-ef67-84af-e41241ffe86a@railnova.eu> Message-ID: <20200714155102.11b379fe@windsurf.home> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net On Tue, 14 Jul 2020 15:31:09 +0200 Titouan Christophe wrote: > > HOST_SCONS_NEEDS_HOST_PYTHON = $(if ($(BR2_PACKAGE_PYTHON),python,python3) > > AFAIK, we usually do the opposite: > $(if $(BR2_PACKAGE_PYTHON3),python3,python) Yes, but the idea is to reverse this progressively, and switch more and more to "Python 3.x" is the default. > In my very own opinion, we should now only use host-python3 everywhere, > unless host-python(2) is strictly required. Pragmatically speaking, in > the rare cases where host-python(2) is still necessary, having both > Pythons on the host would not be that much of an overhead (both in terms > of building time and disk space); and would reduce the clutter in all > the places where we do the fancy dance you describe above. I'm fine with moving towards host-python3 only where possible. > On the target side, I'm also looking forward to invert the target > py2/py3 logic, ie changing > > $(if $(BR2_PACKAGE_PYTHON3),python3,python)) > > into > > $(if $(BR2_PACKAGE_PYTHON),python,python3)) > > especially in package/pkg-python.mk. > > Again, the goal is to have Python3 as default, while still allowing old > Python2-only programs to run where needed. I'll try to find some time > this week to go through the Buildroot tree and update the Python3 > migration page (https://www.elinux.org/Buildroot:Python2Packages), as > there has been some change since the FOSDEM dev days. This shall help us > understand where Python2 is still required. That would be great indeed! Thomas -- Thomas Petazzoni, CTO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com