I've been planning to write about building custom ARM toolchains for a while (I used stuff from gnuarm.com in the past, but I switched to the lastest and greatest upstream versions at some point). Among other things, recent upstream versions now have ARM Cortex support.
First you will need a few base utilities and libs:
$ apt-get install flex bison libgmp3-dev libmpfr-dev autoconf texinfo build-essential
Then you can use my tiny build-arm-toolchain script, which will download, build, and install the whole toolchain:
$ cat build-arm-toolchain
#!/bin/sh
# Written by Uwe Hermann <uwe@hermann-uwe.de>, released as public domain.
TARGET=arm-elf # Or: TARGET=arm-none-eabi
PREFIX=/tmp/arm-cortex-toolchain # Install location of your final toolchain
PARALLEL="-j 2" # Or: PARALLEL=""
BINUTILS=binutils-2.19.1
GCC=gcc-4.3.3
NEWLIB=newlib-1.17.0
GDB=gdb-6.8
export PATH="$PATH:$PREFIX/bin"
mkdir build
wget -c http://ftp.gnu.org/gnu/binutils/$BINUTILS.tar.bz2
tar xfvj $BINUTILS.tar.bz2
cd build
../$BINUTILS/configure --target=$TARGET --prefix=$PREFIX --enable-interwork --enable-multilib \
--with-gnu-as --with-gnu-ld --disable-nls
make $PARALLEL
make install
cd ..
rm -rf build/* $BINUTILS $BINUTILS.tar.bz2
wget -c ftp://ftp.gnu.org/gnu/gcc/$GCC/$GCC.tar.bz2
tar xfvj $GCC.tar.bz2
cd build
../$GCC/configure --target=$TARGET --prefix=$PREFIX --enable-interwork --enable-multilib \
--enable-languages="c" --with-newlib --without-headers --disable-shared --with-gnu-as --with-gnu-ld
make $PARALLEL all-gcc
make install-gcc
cd ..
rm -rf build/* $GCC.tar.bz2
wget -c ftp://sources.redhat.com/pub/newlib/$NEWLIB.tar.gz
tar xfvz $NEWLIB.tar.gz
cd build
../$NEWLIB/configure --target=$TARGET --prefix=$PREFIX --enable-interwork --enable-multilib \
--with-gnu-as --with-gnu-ld --disable-nls
make $PARALLEL
make install
cd ..
rm -rf build/* $NEWLIB $NEWLIB.tar.gz
# Yes, you need to build gcc again!
cd build
../$GCC/configure --target=$TARGET --prefix=$PREFIX --enable-interwork --enable-multilib \
--enable-languages="c,c++" --with-newlib --disable-shared --with-gnu-as --with-gnu-ld
make $PARALLEL
make install
cd ..
rm -rf build/* $GCC
wget -c ftp://ftp.gnu.org/gnu/gdb/$GDB.tar.bz2
tar xfvj $GDB.tar.bz2
cd build
../$GDB/configure --target=$TARGET --prefix=$PREFIX --enable-interwork --enable-multilib
make $PARALLEL
make install
cd ..
rm -rf build $GDB $GDB.tar.bz2
The final toolchain is located in /tmp/arm-cortex-toolchain per default, and is ca. 170 MB in size. I explicitly created the build script in such a way that it minimizes the amount of disk space used during the build (ca. 1.2 GB or so, compared to more than 3 GB in the "naive" approach).
Using the "-j 2" option for make (see script) you can speed up the build quite a bit on multi-core machines (ca. 30 minutes vs. 60 minutes on an AMD X2 dual-core box). Also, you can change the script to build for other target variants if you want to (arm-elf or arm-none-eabi, for example).
Checkout the blog entry How to build arm gnu gcc toolchain for Mac OS X by Piotr Esden-Tempski for similar instructions for Mac OS X users.
Oh, and while I'm at it — does anybody have any idea why there are no pre-built toolchains for embedded (microcontroller) ARM targets in Debian? There are some toolchains for other microcontroller architectures (avr, m68hc1x, h8300, z80) but not too much other stuff. Is there some specific reason for the missing ARM toolchains (other than "nobody cared enough yet")?
I have heard about Emdebian, but from a quick look that seems to be more intended for toolchains with Linux/libc, not for microcontroller firmware (i.e. no MMU, no Linux, no libc etc.), but maybe I'm wrong?
