cross compiler install

###install Linaro's compiler The gcc compiler for ARMv8(aarch64) architecture

first download the compiler file, visit Linaro site.

and then

#.tar.xz convert to .tar
xz -d gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux.tar.xz

#uncompress tar
tar xvf gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux.tar

#put it in /opt
sudo mv gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux /opt
cd /opt
sudo mv gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux aarch64-gcc

#build a soft link in /usr/bin
cd /usr/bin
sudo ln -s /opt/aarch64-gcc/bin/* .

####prepare environment

cd /lib
sudo mkdir aarch64-linux-gnu
cd /opt
sudo cp ./aarch64-gcc/aarch64-linux-gnu/libc/lib/ld-linux-aarch64.so.1 /lib/aarch64-linux-gnu
sudo cp ./aarch64-gcc/aarch64-linux-gnu/libc/lib/aarch64-linux-gnu/libc.so.6 /lib/aarch64-linux-gnu
sudo cp ./aarch64-gcc/aarch64-linux-gnu/lib/libgcc_s.so /lib/aarch64-linux-gnu

cd /lib
sudo ln -s aarch64-linux-gnu/ld-linux-aarch64.so.1 ld-linux-aarch64.so.1

####show version

aarch64-linux-gnu-gdb --version

####test helloworld

write a helloworld C file and then

aarch64-linux-gnu-gcc hello.c -o hello

if you have prepared environment on the top, then run

qemu-aarch64 hello

otherwise, you should add a link path and run

qemu-aarch64 -L /usr/aarch64-linux-gnu/ hello

####or use -static option

aarch64-linux-gnu-gcc -static hello.c -o hello
qemu-aarch64 hello