A shell script to download packages for, configure, build and install a GCC cross-compiler.

build_cross_gcc

#! /bin/bash
set -e
trap 'previous_command=$this_command; this_command=$BASH_COMMAND' DEBUG
trap 'echo FAILED COMMAND: $previous_command' EXIT

#-------------------------------------------------------------------------------------------
# This script will download packages for, configure, build and install a GCC cross-compiler.
# Customize the variables (INSTALL_PATH, TARGET, etc.) to your liking before running.
# If you get an error and need to resume the script from some point in the middle,
# just delete/comment the preceding lines before running it again.
#
# See: http://preshing.com/20141119/how-to-build-a-gcc-cross-compiler
# Package versions: https://ftp.gnu.org/gnu/
# ISL/CLOG: ftp://gcc.gnu.org/pub/gcc/infrastructure
#-------------------------------------------------------------------------------------------

INSTALL_PATH=/opt/cross
TARGET=amd64
USE_NEWLIB=0
LINUX_ARCH=arm64
CONFIGURATION_OPTIONS="--disable-multilib" # --disable-threads --disable-shared
PARALLEL_MAKE=-j4
BINUTILS_VERSION=binutils-2.26
GCC_VERSION=gcc-6.1.0
LINUX_KERNEL_VERSION=linux-$(uname -r | sed 's/-.*//')
KERNEL_SERIES=v$(uname -r | cut -c 1).x
GLIBC_VERSION=glibc-2.23
MPFR_VERSION=mpfr-3.1.4
GMP_VERSION=gmp-6.1.1
MPC_VERSION=mpc-1.0.3
ISL_VERSION=isl-0.16.1
CLOOG_VERSION=cloog-0.18.1
export PATH=$INSTALL_PATH/bin:$PATH

# if the kernel version ends in .0, cut this, as the ftp site will list
# just 3.16 for 3.16.0

if [[ $(echo $LINUX_KERNEL_VERSION | grep ".0" ) != "" ]]; then 

	LINUX_KERNEL_VERSION=linux-$(uname -r | sed 's/-.*//' | sed 's/.0//')

fi

# Use a build dir so we don't have a messy directory wherever we are
BUILD_DIR="$HOME/build-cross-gcc"

if [[ -d "$BUILD_DIR" ]]; then

	rm -rf $BUILD_DIR
	mkdir -p $BUILD_DIR

else

	mkdir -p $BUILD_DIR

fi

# Enter build dir
cd $BUILD_DIR

# Download packages
export http_proxy=$HTTP_PROXY https_proxy=$HTTP_PROXY ftp_proxy=$HTTP_PROXY
wget -nc https://ftp.gnu.org/gnu/binutils/$BINUTILS_VERSION.tar.gz
wget -nc https://ftp.gnu.org/gnu/gcc/$GCC_VERSION/$GCC_VERSION.tar.gz

if [ $USE_NEWLIB -ne 0 ]; then
	wget -nc -O newlib-master.zip https://github.com/bminor/newlib/archive/master.zip || true
	unzip -qo newlib-master.zip
else
	wget -nc https://www.kernel.org/pub/linux/kernel/$KERNEL_SERIES/$LINUX_KERNEL_VERSION.tar.xz
	wget -nc https://ftp.gnu.org/gnu/glibc/$GLIBC_VERSION.tar.xz
fi

# Get sources
wget -nc https://ftp.gnu.org/gnu/mpfr/$MPFR_VERSION.tar.xz
wget -nc https://ftp.gnu.org/gnu/gmp/$GMP_VERSION.tar.xz
wget -nc https://ftp.gnu.org/gnu/mpc/$MPC_VERSION.tar.gz
wget -nc ftp://gcc.gnu.org/pub/gcc/infrastructure/$ISL_VERSION.tar.bz2
wget -nc ftp://gcc.gnu.org/pub/gcc/infrastructure/$CLOOG_VERSION.tar.gz

# Extract everything
for f in *.tar*; 
do 
	echo -e "Extracting archive: $f"
	tar xfk $f; 
done

# Make symbolic links
cd $GCC_VERSION
ln -sf `ls -1d ../mpfr-*/` mpfr
ln -sf `ls -1d ../gmp-*/` gmp
ln -sf `ls -1d ../mpc-*/` mpc
ln -sf `ls -1d ../isl-*/` isl
ln -sf `ls -1d ../cloog-*/` cloog
cd ..

# Step 1. Binutils
echo -e "\n==> Building stage 1: binutils\n" && sleep 2s
mkdir -p build-binutils
cd build-binutils
../$BINUTILS_VERSION/configure --prefix=$INSTALL_PATH --target=$TARGET $CONFIGURATION_OPTIONS
make $PARALLEL_MAKE
make install
cd ..

# Step 2. Linux Kernel Headers
echo -e "\n==> Building stage 2: kernel headers\n" && sleep 2s

if [ $USE_NEWLIB -eq 0 ]; then
	cd $LINUX_KERNEL_VERSION
	make ARCH=$LINUX_ARCH INSTALL_HDR_PATH=$INSTALL_PATH/$TARGET headers_install
	cd ..
fi

# Step 3. C/C++ Compilers
echo -e "\n==> Building stage 3: C/C++ compilers\n" && sleep 2s
mkdir -p build-gcc
cd build-gcc

if [ $USE_NEWLIB -ne 0 ]; then
	NEWLIB_OPTION=--with-newlib
fi

../$GCC_VERSION/configure --prefix=$INSTALL_PATH --target=$TARGET --enable-languages=c,c++ $CONFIGURATION_OPTIONS $NEWLIB_OPTION
make $PARALLEL_MAKE all-gcc
make install-gcc
cd ..

if [ $USE_NEWLIB -ne 0 ]; then
	# Steps 4-6: Newlib
	echo -e "\n==> Building stage 4-6: newlibs\n" && sleep 2s
	mkdir -p build-newlib
	cd build-newlib
	../newlib-master/configure --prefix=$INSTALL_PATH --target=$TARGET $CONFIGURATION_OPTIONS
	make $PARALLEL_MAKE
	make install
	cd ..
else
	# Step 4. Standard C Library Headers and Startup Files
	echo -e "\n==> Building stage 4: glibc/gcc\n" && sleep 2s
	mkdir -p build-glibc
	cd build-glibc
	../$GLIBC_VERSION/configure --prefix=$INSTALL_PATH/$TARGET --build=$MACHTYPE --host=$TARGET --target=$TARGET --with-headers=$INSTALL_PATH/$TARGET/include $CONFIGURATION_OPTIONS libc_cv_forced_unwind=yes
	make install-bootstrap-headers=yes install-headers
	make $PARALLEL_MAKE csu/subdir_lib
	install csu/crt1.o csu/crti.o csu/crtn.o $INSTALL_PATH/$TARGET/lib
	$TARGET-gcc -nostdlib -nostartfiles -shared -x c /dev/null -o $INSTALL_PATH/$TARGET/lib/libc.so
	touch $INSTALL_PATH/$TARGET/include/gnu/stubs.h
	cd ..
	
	# Step 5. Compiler Support Library
	echo -e "\n==> Building stage 5: gcc support library\n" && sleep 2s
	cd build-gcc
	make $PARALLEL_MAKE all-target-libgcc
	make install-target-libgcc
	cd ..
	
	# Step 6. Standard C Library & the rest of Glibc
	echo -e "\n==> Building stage 6: C library and rest glibc\n" && sleep 2s
	cd build-glibc
	make $PARALLEL_MAKE
	make install
	cd ..
fi

# Step 7. Standard C++ Library & the rest of GCC
echo -e "\n==> Building stage 7: C++ library and rest glibc\n" && sleep 2s
cd build-gcc
make $PARALLEL_MAKE all
make install
cd ..

trap - EXIT
echo 'Success!'