Differences between revisions 47 and 48
Revision 47 as of 2015-05-04 01:24:15
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Revision 48 as of 2015-05-23 20:03:25
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== I want a combination of BUILD x HOST not in Debian on unstable == == I want a combination of BUILD x HOST not in Debian (on jessie or later) ==
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'''Note''': in jessie cross-gcc-gensource will fail if dash is your default shell. (DebianBug:#780583). Either set the /bin/sh link to bash {{{sudo ln -sf bash /bin/sh}}} or add
{{{SHELL := bash}}} near the start of /usr/share/cross-gcc/template/rules.generic
(fixed in cross-gcc 17)
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You will need sbuild 0.64.3 or later installed, and a suitable chroot or build env for the target suite. You will need sbuild 0.64.3 or later installed, and a suitable chroot or build env for the target suite. You will also need a <triplet>-binutils package.

If the cross-binutils you need is not available on your arch, build one (or more) like this:
{{{
apt-get source cross-binutils
cd cross-binutils-0.23
sudo apt-get build-dep cross-binutils
TARGET_LIST="arm64" HOST_LIST="armhf" debian/rules control
TARGET_LIST="arm64" HOST_LIST="armhf" dpkg-buildpackage
}}}

(Crosstoolchain documentation is now collected and indexed on CrossToolchains)

Building a Cross Compiler

Very few people need to build a cross-toolchain. It is a complicated business and unless you are doing something really quite obscure you should just install a suitable apt-able toolchain. Installation info is on CrossToolchains.

We'll say that again: MOST PEOPLE SHOULDN'T BE BUILDING THEIR OWN CROSS-TOOLCHAIN - THEY SHOULD JUST INSTALL A PRE-BUILT ONE LIKE ANY OTHER PACKAGE.

But there are reasons why you might need to do this.

I really do want to build a cross compiler

Pick the most relevant heading from the list below.

I want a combination of BUILD x HOST not in Debian (on jessie or later)

HOST is a debian release architecture

If HOST is a debian release architecture then this is fairly straightforward:

  • Install the cross-gcc-dev binary package

apt-get install cross-gcc-dev

This is available from jessie (Debian 8) onwards

  • Generate a cross-gcc-<gccver>-<arch> source package

TARGET_LIST=<hostarch> cross-gcc-gensource <gccver>

Fill in your own <hostarch> and <gccver> above. (e.g. TARGET_LIST="armel armhf" cross-gcc-gensource 4.9) In jessie only '4.9' is supported as a gcc version.

This will generate (in a directory called cross-gcc-packages-<buildarch>) a cross-gcc-<gccver>-<arch> source package for each arch in the TARGET_LIST.

Note: in jessie cross-gcc-gensource will fail if dash is your default shell. (). Either set the /bin/sh link to bash sudo ln -sf bash /bin/sh or add SHELL := bash near the start of /usr/share/cross-gcc/template/rules.generic (fixed in cross-gcc 17)

  • Build it

cd cross-gcc-<gccver>-<arch>
sbuild -d jessie 

You will need sbuild 0.64.3 or later installed, and a suitable chroot or build env for the target suite. You will also need a <triplet>-binutils package.

If the cross-binutils you need is not available on your arch, build one (or more) like this:

apt-get source cross-binutils
cd cross-binutils-0.23
sudo apt-get build-dep cross-binutils
TARGET_LIST="arm64" HOST_LIST="armhf" debian/rules control
TARGET_LIST="arm64" HOST_LIST="armhf" dpkg-buildpackage

A more manual build, probably best done in a chroot, could be

cd packages/cross-gcc-4.9-<hostarch>
dpkg --add-architecture <hostarch>
apt-get update
[install build-deps]
dpkg-buildpackage

(This essentially automates the procedure described on MultiarchCrossToolchainBuild).

HOST is not a debian release architecture

If HOST is not a debian release architecture (debian-ports architecture or a new arch), then it may be much harder because you need to do a full kernel/libc/gcc bootstrap. cross-toolchain-base packages exist in Ubuntu for this for some architectures, but the procedure is broken in Debian at the time of writing (May 2015) so you'll need to fiddle with patches. We do hope to have this working soon.

I want the very latest arm support

Linaro's cross-toolchains (tarball install, sadly) are very up to date with patches and support, and may well be useful. But they are supplied as a binary tarball, not as debian packages.

I want toolchain packages for wheezy

The packages on emdebian.org aimed at wheezy have been uninstallable for a long time. Install buildcross from experimental and use that to build your own.

<some instructions here would be helpful>