On Wed, May 5, 2021 at 5:52 AM Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote: > > On Wed, 2021-05-05 at 05:46 +0900, Masahiro Yamada wrote: > > > > - This commit touches scripts/Kconfig.include. > > - External module builds (M= builds) never invoke Kconfig > > > > Putting these two together, your claim is really odd. > > Hmm. > > > If external module builds invoke Kconfig, > > your kernel is already broken. > > Well, it's not about the kernel, that's just the normal upstream (or > perhaps distribution) kernel. > > Anyway, you're right, it's much simpler. The problem isn't invoking M= > or something like that, that happens much later and sent me on the > completely wrong track. > > The problem is simply doing > > make kernelversion > > to determine the version of a tree that's not writable to the user, e.g. > > make -C /lib/modules/$(uname -r)/build/ kernelversion > > Which basically also means that it's harmless, since the version is of > course not affected by cc-option. It was fixed. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=805b2e1d427aab4bb27fa7c51ebb9db7547551b1 If you want to make it work without that commit, make -C /lib/modules/$(uname -r)/build/ kernelversion M=/tmp will work. Pass a writable directory to M=. M= build never touches the kernel source tree. > johannes > -- Best Regards Masahiro Yamada
