+++ John Morris [2015-04-06 23:33 -0500]: > Does anyone know if the upstream Debian kernel package can be > cross-built?
I think this works fine. I cross-built the debian kernel packages recently. I think this should do the trick: first get a cross-toolchain installed: dpkg --add-architecture armhf apt-get update apt-get install crossbuild-essential-armhf (this will need an external repo on jessie, and right now is broken in unstable. See: https://wiki.debian.org/CrossToolchains#Installation) Then get kernel source and build it: apt-get source linux-3.16 apt-get build-dep linux dpkg-buildpackage -aarmhf -B -d > I suspect the answer is 'no', because of it > `Build-Depends: gcc-4.9` and I don't see anywhere the Emdebian > toolchain `Provides:` that. Right - there is currently a problem that build-dependencies on particular gcc versions do not 'translate' to the relevant cross dependency. This was discussed at the bootstrap sprint last year where 6 possible solutions were considered, and a 7th one eventually chosen :-) See section 4.1 of https://wiki.debian.org/Sprints/2014/BootstrapSprint/Results A demonstration of that solution has been demonstrated but it is not yet in the archive. (http://anonscm.debian.org/cgit/crosstoolchain/gcc-cross-support.git/) In practice this currently means that you have to build such packages by ensuring 'manually' that the right cross-gcc packages are installed (normally using crossbuild-essential-<arch>). > In the case of 'no', does anyone know how this is typically dealt > with when converting packages to Multiarch? If it's atypical for > packages to configure a specific gcc version, I can hack something, > but if there's a standard approach, maybe I can try something that > can be contributed back. It is best if packages don't build-dep on a particular version of gcc (indeed they almost always only do due to bugs with newer versions). The proper way to work on this is to get the above mechanism into the archive. That gcc-cross-support package should be combined with cross-gcc-defaults, and that should probably be combined with gcc-defaults. Patches for those mergings would be helpful. There are current questions about the cross gcc roadmap which mean it may take a while to get this stuff in, but I hope we can do it in stretch, as it allows package maintainers to build-dep on gcc-<ver>-for-host and gcc-<ver>-for build and the right compailers will magically be installed. Wookey -- Principal hats: Linaro, Debian, Wookware, ARM http://wookware.org/ -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
