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 $ARCH linux-kernel-headers libc6 libc6-dev'
- 'apt-get source' binutils and gcc-4.1
- cd binutils and run:
- TARGET=$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 natural-flavours and run 'rrr includedeb etch deb-files...'.
Emdebian is the Debian project responsible for dpkg-cross, apt-cross, and emdebian-tools.
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 is a front-end to dpkg-cross. It will automatically fetch and build cross packages.
Emdebuild is an architecture aware version of debuild.