AUTHOR: Robert Connolly <robert linuxfromscratch org> (ashes)

DATE: 2007-10-15

LICENSE: Public Domain

SYNOPSIS: How to install an m68k cross compiler.

PRIMARY URI: http://www.linuxfromscratch.org/~robert/new/m68k-compiler.txt

DESCRIPTION:

This hint is written because the cross compiler howto's I found are a few
years old and are not particularly suited for a standard LFS installation.

This hint does not show how to install a cross compiled C library, although
it could be adapted to. If you want to cross compile a C library I suggest
you look at:

	http://www.linuxfromscratch.org/clfs/
and
	http://buildroot.uclibc.org/
and
	http://kegel.com/crosstool/

PREREQUISITES: A native compiler (included with any LFS version).

HINT:

I'm installing a cross toolchain for my iRiver portable audio player (m68k).

- Binutils
  First disable the installation of 'libiberty.a' so that we do not replace
  the one in /usr/lib on the host system:

sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in

  We probably do not want to replace our info or manual pages, so we can
  install those to /tmp/stuff. Native language support is disabled so it does
  not replace the files on the host system, and because a cross toolchain does
  not need it. Using CFLAGS when building a cross toolchain is generally a bad
  idea, so they're disabled here. Your CONFIG_SITE, if any, is probably also
  bad here. Change your "--target" option as needed, and build with (as
  regular user):

mkdir obj &&
cd obj &&
env -u CFLAGS CONFIG_SITE=/dev/null \
  ../configure --prefix=/usr --disable-nls --target=m68k-elf \
    --mandir=/tmp/stuff --infodir=/tmp/stuff --datadir=/tmp/stuff &&
make CONFIG_SITE=/dev/null &&
make DESTDIR=$(pwd)/DESTDIR install

  Make sure everything in "DESTDIR/" looks right (ignore DESTDIR/tmp/stuff/),
  and install with (as root):

make install &&
rm -rf /tmp/stuff

- GCC
  Disable the installation of 'libiberty.a':

sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in

  We can't cross compile libssp or libmudflap, so those are disabled. Compile
  GCC with (as regular user):

mkdir obj &&
cd obj &&
env -u CFLAGS CONFIG_SITE=/dev/null \
  ../configure --disable-nls --prefix=/usr --libexecdir=/usr/lib \
    --target=m68k-elf --mandir=/tmp/stuff --infodir=/tmp/stuff \
     --datadir=/tmp/stuff --disable-libmudflap --disable-libssp \
      --enable-languages=c &&
make CONFIG_SITE=/dev/null &&
make DESTDIR=$(pwd)/DESTDIR install

  Check that everything in "DESTDIR/usr/" looks right, and install (as root):

make install &&
rm -rf /tmp/stuff

Then use CC="m68k-elf-gcc".

  Uninstalling is easy. Use 'find /usr -name "*m68k-elf*" -exec rm -rf {} \;'.

ACKNOWLEDGMENTS:
  * None.

CHANGELOG:
[2007-10-15]
  * Initial hint.