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Cross-compile-o-naut wookey has recently posted a set of Debian & Ubuntu packages for an aarch64 (ie, 64-bit ARMv8) cross compiler:

The repositories here contain sources and binaries for the arm64 bootstrap in Debian (unstable) and Ubuntu (quantal). There are both toolchain and tools packages for amd64 build machines and arm64 binaries built with them. And corresponding sources.

For the lazy:

[jk@pecola ~]$ wget -O - |
    sudo apt-key add -
[jk@pecola ~]$ sudo apt-add-repository 'deb quantal-bootstrap main universe'
[jk@pecola ~]$ sudo apt-get update
[jk@pecola ~]$ sudo apt-get install --install-recommends gcc-4.7-aarch64-linux-gnu

... which gives you a cross compiler for aarch64:

[jk@pecola ~]$ cat helloworld.c 
#include <stdio.h>
int main(void) { printf("hello world\n"); return 0; }
[jk@pecola ~]$ aarch64-linux-gnu-gcc-4.7 -Wall -O2 -o helloworld helloworld.c
[jk@pecola ~]$ aarch64-linux-gnu-objdump -f helloworld 
helloworld:     file format elf64-littleaarch64
architecture: aarch64, flags 0x00000112:
start address 0x0000000000400450

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Most of the components of the 64-bit ARM toolchain have been released, so I've put together some details on building a cross compiler for aarch64. At present, this is only binutils & compiler (ie, no libc), so is probably not useful for applications. However, I have a 64-bit ARM kernel building without any trouble.

Update: looking for an easy way to install a cross-compiler on Ubuntu or debian? Check out aarch64 cross compiler packages for Ubuntu & Debian.

pre-built toolchain

If you're simply looking to download a cross compiler, here's one I've built earlier: aarch64-cross.tar.gz (.tar.gz, 85MB). It's built for an x86_64 build machine, using Ubuntu 12.04 LTS, but should work with other distributions too.

The toolchain is configured for paths in /opt/cross/. To install it, do a:

[jk@pecola ~]$ sudo mkdir /opt/cross
[jk@pecola ~]$ sudo chown $USER /opt/cross
[jk@pecola ~]$ tar -C /opt/cross/ -xf aarch64-x86_64-cross.tar.gz

If you'd like to build your own, here's how:

initial setup

We're going to be building in ~/build/aarch64-toolchain/, and installing into /opt/cross/aarch64/. If you'd prefer to use other paths, simply change these in the commands below.

[jk@pecola ~]$ mkdir -p ~/build/arm64-toolchain/
[jk@pecola ~]$ cd ~/build/arm64-toolchain/
[jk@pecola ~]$ prefix=/opt/cross/aarch64/

We'll also need a few packages for the build:

[jk@pecola ~]$ sudo apt-get install bison flex libmpfr-dev libmpc-dev texinfo


I have a git repository with a recent version of ARM's aarch64 support, plus a few minor updates at git:// (or browse the gitweb view). To build:

Update: arm64 support has been merged into upstream binutils, so you can now use the official git repository. The commit 02b16151 builds successfully for me.

[jk@pecola arm64-toolchain]$ git clone git://
[jk@pecola arm64-toolchain]$ cd binutils
[jk@pecola binutils]$ ./configure --prefix=$prefix --target=aarch64-none-linux
[jk@pecola binutils]$ make
[jk@pecola binutils]$ make install
[jk@pecola binutils]$ cd ..

kernel headers

Next up, the kernel headers. I'm using Catalin Marinas' kernel tree on here. We don't need to do a full build (we don't have a compiler yet..), just the headers_install target.

[jk@pecola arm64-toolchain]$ git clone git://
[jk@pecola arm64-toolchain]$ cd linux-aarch64
[jk@pecola linux-aarch64]$ git reset --hard b6fe1645
[jk@pecola linux-aarch64]$ make ARCH=arm64 INSTALL_HDR_PATH=$prefix headers_install
[jk@pecola linux-aarch64]$ cd ..


And now we should have things ready for the compiler build. I have a git tree up at git:// (gitweb), but this is just the aarch64 branch of upstream gcc.

[jk@pecola arm64-toolchain]$ git clone git://
[jk@pecola arm64-toolchain]$ cd gcc/aarch64-branch/
[jk@pecola aarch64-branch]$ git reset --hard d6a1e14b
[jk@pecola aarch64-branch]$ ./configure --prefix=$prefix \
    --target=aarch64-none-linux --enable-languages=c \
    --disable-threads --disable-shared --disable-libmudflap \
    --disable-libssp --disable-libgomp --disable-libquadmath
[jk@pecola aarch64-branch]$ make
[jk@pecola aarch64-branch]$ make install
[jk@pecola aarch64-branch]$ cd ../..

That's it! You should have a working compiler for arm64 kernels in /opt/cross/aarch64.

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