Cross Compiling

Builder

Builder is a vserver that is used to build cross-compilers and cross-packages that that have --host=amd64. The current list of installed cross-compilers includes alpha, arm, hppa (binutils only), i486, ia64, m68k, mips, mipsel, powerpc, sparc and x86_64. www.emdebian.org builds a number of cross-compilers, which can be installed by adding the following lines to /etc/apt/sources.list:

deb http://mirror.csclub.uwaterloo.ca/emdebian/ stable main
deb-src http://mirror.csclub.uwaterloo.ca/emdebian/ stable main

Building a cross-compiler

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

• sudo apt-get install apt-cross dpkg-cross autoconf automake gawk flex bison debhelper devscripts cdbs fakeroot
• apt-cross -a $ARCH -i linux-kernel-headers libc6 libc6-dev
• apt-get source binutils gcc-4.1
• cd binutils and run:
  • TARGET=$ARCH-linux-gnu fakeroot debian/rules binary-cross
• sudo dpkg -i binutils-$ARCH-linux-gnu_*.deb
• cd gcc-4.1 and run:
  • export GCC_TARGET=$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
• sudo dpkg -i gcc-4.1-*.deb

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...'.

Building a cross-package

There are a few tools that are useful for building cross-packages:

• emdebuild: an architecture aware version of debuild.
• dpkg-cross: 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: a front-end to dpkg-cross. It will automatically fetch and build cross packages.

SPARC Solaris 8 (student environment)

Initial setup:

export TARGET=sparc-sun-solaris2.8
export PREFIX=/opt/$TARGET-toolchain
export WORKDIR=/tmp/$TARGET-toolchain
export PATH=$PREFIX/bin:$PATH

Fetch Solaris includes/libs:

cd $WORKDIR
rsync -rtLv cpu20.student.cs.uwaterloo.ca:/usr/lib lib
rsync -rtLv cpu20.student.cs.uwaterloo.ca:/usr/include include

Binutils:

cd $WORKDIR
wget http://ftp.gnu.org/gnu/binutils/binutils-2.18.tar.bz2 && tar -xjf binutils-2.18.tar.bz2
mkdir $WORKDIR/build-binutils && cd $WORKDIR/build-binutils
../binutils-2.18/configure --target=$TARGET --prefix=$PREFIX
make -j4 && make install

GCC:

cd $WORKDIR
wget http://ftp.gnu.org/gnu/gcc/gcc-3.4.6/gcc-3.4.6.tar.bz2 && tar -xjf gcc-3.4.6.tar.bz2
../gcc-3.4.6/configure --target=$TARGET --prefix=$PREFIX --enable-languages=c,c++ --with-gnu-ld --with-gnu-as --disable-shared \
  --disable-multilib --enable-threads=posix --enable-long-long --with-headers=$WORKDIR/include --with-lib=$WORKDIR/lib