Cross Compiling

Instructions for compiling an i386 multlib toolchain:

• Install apt-cross, dpkg-cross, autoconf, automake, gawk, flex, bison, debhelper, devscript, cdbs, fakeroot
• Download i386 binary packages of linux-kernel-headers, libc6, libc6-dev, libc6-amd64, libc6-dev-amd64
• Run 'dpkg-cross -a i386 -b package' for each of the above packages
• Install the resulting cross packages that were created by dpkg-cross above
• 'apt-get source' binutils and gcc-4.1
• cd binutils and run:
  • TARGET=i486-linux-gnu fakeroot debian/rules binary-cross
• Install resulting cross binutils
• cd gcc-4.1 and run:
  • export GCC_TARGET=i386
  • export DEB_CROSS_INDEPENDENT=yes
  • export WITHOUT_LANG=java,fortran,pascal,obj,obj-c++,ada,treelang
  • debian/rules control
  • dpkg-buildpackage -b -rfakeroot
  • gcc will fail to build do to a small error:
    • src/libmudflap/mf-runtime.c:172: the type on __mf_lc_mask needs to be set to __mf_uintptr_t
  • dpkg-buildpackage -b -rfakeroot -nc
• Install resulting cross gcc-4.1

It's generally useful to upload these built packages to the CSC debian repository. The problem is that .changes files don't get generated. dpkg-genchanges might be able to help here.

If you need i386 binary libraries, you can run 'apt-cross -a i386 -install package'.