Cross Compiling

Builder

Builder is a vserver that contains various cross-compilers. The current list of installed cross-compilers includes alpha, arm, hppa (binutils only), i486, ia64, m68k, mips, mipsel, powerpc, sparc and x86_64.

Builder contains cross-compilers capable of building packages for all architectures that the CSC currently uses. As such, it should be possible to completely automate building of a specific package for all needed architectures.

Compiling a toolchain

• export ARCH=architecture (arm, i386, etc...)

• Install apt-cross, dpkg-cross, autoconf, automake, gawk, flex, bison, debhelper, devscripts, cdbs, fakeroot
• Run 'apt-cross -a $ARCH -i linux-kernel-headers libc6 libc6-dev'
• 'apt-get source' binutils and gcc-4.1
• cd binutils and run:
  • TARGET=$ARCH-linux-gnu fakeroot debian/rules binary-cross
• Install resulting cross binutils
• cd gcc-4.1 and run:
  • export GCC_TARGET=$ARCH
  • export DEB_CROSS_INDEPENDENT=yes
  • export WITHOUT_LANG=java,fortran,pascal,obj,obj-c++,ada,treelang
  • export DEB_CROSS_NO_BIARCH=yes
  • debian/rules control
  • dpkg-buildpackage -b -rfakeroot
• Install resulting cross gcc-4.1

It's generally useful to upload these built packages to the CSC debian repository. To do this you need to scp the .deb's over to debian.csclub and run 'rrr-includedeb deb-files...'.

Emdebian

Emdebian is the Debian project responsible for dpkg-cross, apt-cross, and emdebian-tools.

Dpkg-cross

Dpkg-cross is a version of dpkg that allows you to install architecture-specific libraries in an isolated way. For example, dpkg-cross will build a package called libc6-mips-cross from the mips libc6 package. This cross package can then be installed alongside the mips cross-compiler.

Apt-cross

Apt-cross is a front-end to dpkg-cross. It will automatically fetch and build cross packages.

Emdebuild

Emdebuild is an architecture aware version of debuild.

Sun4u

• DEB_TARGET_GNU_TYPE=sparc-sun-solaris2.8
• DEB_TARGET_ALIAS=sparc-sun-solaris2.8
• DEB_TARGET_ARCH=sparc-sun-solaris2.8