Messages in this thread | | | From | Arnd Bergmann <> | Date | Wed, 3 Jun 2020 16:05:27 +0200 | Subject | Re: headers_install builds break on a lot of targets? |
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On Wed, Jun 3, 2020 at 3:49 PM Rob Landley <rob@landley.net> wrote: > > The headers_install_all target got removed last year (commit f3c8d4c7a728 and > would someone like to update Documentation/kbuild/headers_install.txt which > still describes it?) > > The musl-libc maintainer is using a forked hand-hacked kernel header package in > his toolchain build project (https://github.com/richfelker/musl-cross-make), and > he said the reason for it is: > > http://lists.landley.net/pipermail/toybox-landley.net/2020-March/011536.html > > Because downloading 100 MB of kernel source and extracting it to a far > larger tree just to get the headers isn't really fun. > > And I thought "that's why headers_install_all existed", and noticed the target > being removed, so I tried my hand at a small shell script vesion: > > for i in $(echo arch/*/ | sed 's@arch/\([^/]*\)/@\1@g') > do > echo $i > X="$PWD/fruitbasket/$i" > mkdir -p "$X" > make ARCH=$i distclean defconfig headers_install \ > INSTALL_HDR_PATH="$PWD/fruitbasket/$i" > /dev/null > done > > On the bright side, the resulting fruitbasket.tar.xz is 1.5 megabytes. The > downside is I have no idea how broken the resulting header files are after this > error-fest:
I think the problem is that you can no longer run 'make defconfig ARCH=foo' without passing a CROSS_COMPILE=${ARCH}-linux-gnu- argument pointing to a valid toolchain target triple.
You can use the cross-compilers from https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/10.1.0/ to do this if you need kernel headers for an architecture that you have no cross-compilers for, but they are build against glibc and won't run on a musl based host, or anything other than x86-64, arm64 or ppc64le that I built for.
I don't know if you can just run 'make headers_install' without configuring first, or if that is something that can be easily changed if it doesn't already work.
Arnd
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