cross-compiling [jsln]

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Setting up a [[crosstool-ng]] environment for ARM7 target

===== Building Older GCC Versions on x86-64 Debian/Ubuntu =====

http://www.trevorpounds.com/blog/?p=111


===== Compiling 32-bit (i386) binaries in 64-bit (amd64) debian =====

apt-get install ia32-libs ia32-libs-gtk

gcc -m32 (see http://wiki.debian.org/DebianAMD64Faq)

linux32 make

[[http://sparlampe.wordpress.com/2011/01/07/cross-compiling-i386-kernel-on-amd64-machine-using-make-kpkg/|Building an i386 kernel package on an amd64 machine without chroot]]


===== Cross-building for ARM in Ubuntu 64-bit =====

In addition to ia32-libs, install gcc-arm-linux-gnueabi (armel), or gcc-arm-linux-gnueabihf (armhf).

We can do clean cross-builds using full qemu emulation or using user mode emulation with a chroot. Both options are described in the [[https://wiki.ubuntu.com/ARM/RootfsFromScratch|Ubuntu RootfsFromScratch page]]. 

See also:

[[https://wiki.edubuntu.org/ARM/BuildArmPackages|Using qemu]]. Here we create a rootfs with rootstock and run qemu with full emulation, which allows us to build packages inside the VM with the usual tools like pbuilder.

[[http://wiki.globalshellz.org/gsh/Ubuntu_ARM_cross_chroot_HOWTO|Using a chroot]]. Qemu with user mode emulation and a chroot to be able to run the binaries.

Useful Linaro [[https://wiki.linaro.org/Platform/DevPlatform/CrossCompile/CrossBuilding|cross-build pages]].

The latest way of creating a rootfs is through [[http://omappedia.org/wiki/OMAP_Ubuntu_Core|Ubuntu Core]].

http://ports.ubuntu.com/ubuntu-ports/dists/precise/main/installer-armel/current/images/omap4/cdrom/vmlinuz

  rootstock --fqdn qemu-test --login qemu --password qemu --imagesize 2G --seed build-essential,openssh-server --notarball
  wget http://ports.ubuntu.com/ubuntu-ports/dists/precise/main/installer-armel/current/images/omap4/cdrom/vmlinuz