adding gnu toolchain build script, to build your own cross compiler

buildgcc/README

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+
+A script for building your own gnu toolchain for ARM.
+
+Derived directly from the same script at the mpx project at opencores.org
+
+Keep or change the PREFIX in the script to a path where you want the
+binary to end up.
+
+sudo ./build_gcc
+
+then put whatever you had in your prefix/bin in the path.  The default
+gnuarm would mean /gnuarm/bin goes in the PATH.
+

buildgcc/build_gcc

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+
+# Usage
+# sudo ./build_gcc
+
+# Setup vars
+export TARGET=arm-none-eabi
+export PREFIX=/gnuarm
+export PATH=$PATH:$PREFIX/bin
+
+rm -rf build-*
+rm -rf gcc-*
+rm -rf binutils-*
+
+# Get archives
+wget http://ftp.gnu.org/gnu/binutils/binutils-2.22.tar.bz2
+wget http://ftp.gnu.org/gnu/gcc/gcc-4.7.0/gcc-4.7.0.tar.bz2
+
+# Extract archives
+bzip2 -dc binutils-2.22.tar.bz2 | tar -xf -
+bzip2 -dc gcc-4.7.0.tar.bz2 | tar -xf -
+
+# Build binutils
+mkdir build-binutils
+cd build-binutils
+../binutils-2.22/configure --target=$TARGET --prefix=$PREFIX
+make all
+make install
+
+# Build GCC
+mkdir ../build-gcc
+cd ../build-gcc
+../gcc-4.7.0/configure --target=$TARGET --prefix=$PREFIX --without-headers --with-newlib  --with-gnu-as --with-gnu-ld
+make all-gcc
+make install-gcc
+
+# Build libgcc.a
+make all-target-libgcc CFLAGS_FOR_TARGET="-g -O2"
+make install-target-libgcc
+