Date: Wed, 24 Jul 2024 00:31:23 -0700 From: Mark Millard <marklmi@yahoo.com> To: John Baldwin <jhb@freebsd.org>, freebsd-arch <freebsd-arch@freebsd.org> Subject: RE: Default NO_CLEAN=yes in 15+ Message-ID: <2BB28579-7C7B-4268-B3C6-BD8E11233CE7@yahoo.com> References: <2BB28579-7C7B-4268-B3C6-BD8E11233CE7.ref@yahoo.com>
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John Baldwin <jhb_at_FreeBSD.org> wrote on Date: Tue, 23 Jul 2024 19:58:13 UTC : > The buildworld and buildkernel targets include a "clean" step before = building > objects dating back before my time to 'make world' (I haven't looked = to see > how far back it goes). To permit incremental builds, this step can be = skipped > via NO_CLEAN=3Dyes. This step is a bit unusual in build systems = however. Most > build systems have separate commands for building vs cleaning (e.g. = 'make all' > vs 'make clean') and over time FreeBSD's build system has gained = dedicated > clean targets as well (cleanworld and cleankernel). For myself, I = always > use NO_CLEAN=3Dyes when building worlds and kernels. If I need a clean = build > I use the dedicated clean targets (e.g. cleanworld) first. In = particular, > cleanworld/cleankernel are far more efficient since they use a single > recursive 'rm' whereas the "clean" step involves a full tree walk with > nested make invocations of the 'cleandir' target. >=20 > A few years ago, Ed Maste added a MK_CLEAN option to src.opts.mk to as = a > WITH/WITHOUT knob for the "clean" step similar to NO_CLEAN=3Dyes. To = preserve > existing behavior this knob currently defaults to on, but I know Ed's = goal > was to eventually flip the default so that NO_CLEAN builds would be = the > default. I would like us to do that starting in 15. >=20 > Further off, I would suggest that we remove the "clean" step outright, > perhaps in 16.x. Regardless, we will need to update documentation to > prefer the clean targets over WITH_CLEAN=3Dyes if our docs do not do = this > already. I use META_MODE and do not explicitly control NO_CLEAN. Any implications for META_MODE for this change? =3D=3D=3D Mark Millard marklmi at yahoo.com
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