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Tough (but interesting!) topic. Indeed, this had been bugging me for a long time, so here we go again. > > On Fri, Oct 23, 2026 at 02:47:44PM -0700, Florian Fainelli via buildroot wrote: > >> Patch 9, the kernel: >> - add _SUPPORTS_OUT_OF_TREE. When it is YES and _OVERRIDE_SRCDIR >> is set, the rsync step is skipped, the stamp files go in the build >> directory and kconfig is called with -C $(SRCDIR) O=$(BUILDDIR); >> - opt linux in, in the same patch. Kbuild requires a clean source tree >> for O=: a tree with a stale .config, include/config or >> arch/*/include/generated is rejected by kbuild itself. > > So it means out of tree build is only used when _OVERRIDE_SRCDIR > is used, and for a "normal" build, you still use in-tree build? (Note: > I didn't check the patches yet). Correct. Out-of-tree is only used when _OVERRIDE_SRCDIR is set and the package opts in with _SUPPORTS_OUT_OF_TREE = YES (only linux for now). For a normal build the tarball is extracted into the build directory as before, and _SRCDIR, _BUILDDIR and _DIR are all the same directory, so there is no change for any package. The goal is to avoid the rsync of a developer's source tree, which does not exist for a downloaded tarball. Other packages could opt in later with the same variable if there is interest. > > If we were to merge something like this, we would need to switch to > out-of-tree build completely, not just for the specific > _OVERRIDE_SRCDIR situation. I wonder if this makes sense however, not arguing about it, but trying to think whether it brings anything? -- Florian _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot