[Embedded] Building Gdb For Cross Compile

#export CROSS=arm-none-linux-gnueabi
#export CC=${CROSS}-gcc
#export CXX=${CROSS}-gcc
#export LD=${CROSS}-ld
#export AS=${CROSS}-as
#export AR=${CROSS}-ar
#./configure --host=arm-linux
#make

Reference: 
[1] https://how-to-build-for-arm.wikispaces.com/gdb