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

build_cross_gcc.sh

#! /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
#-------------------------------------------------------------------------------------------

INSTALL_PATH=/opt/local/cross
LINUX_ARCH=arm64
PARALLEL_MAKE=-j4
HAS_SYMLINK=0 # set to 1 for building under Linux or anywhere else that can do symlink
BUILD_CI_FS=1 # set to 0 for building under Linux or other case sensistive file systems
USE_NEWLIB=0
if [ $USE_NEWLIB -ne 0 ]; then
    TARGET=aarch64-elf
    CONFIGURATION_OPTIONS="--disable-multilib" # --disable-threads --disable-shared
else
    TARGET=aarch64-linux
    CONFIGURATION_OPTIONS="--disable-multilib" # --disable-threads --disable-shared
fi
BINUTILS_VERSION=binutils-2.29.1
GCC_VERSION=gcc-7.3.0
LINUX_KERNEL_VERSION=linux-3.17.2
GLIBC_VERSION=glibc-2.27
MPFR_VERSION=mpfr-3.1.4
GMP_VERSION=gmp-6.1.2
MPC_VERSION=mpc-1.0.3
ISL_VERSION=isl-0.16.1
CLOOG_VERSION=cloog-0.18.1
export PATH=$INSTALL_PATH/bin:$PATH

extract() {
    local tarfile="$1"
    local extracted="$(echo "$tarfile" | sed 's/\.tar.*$//')"
    if [ ! -d  "$extracted" ]; then
        echo "Extracting ${tarfile}"
        tar -xf $tarfile
    fi
}

extract_to_gcc_folder() {
    local tarfile="$1"
    local subfolder="$(echo "$tarfile" | sed 's/-.*$//')"
    if [ ! -d  "$GCC_VERSION/$subfolder" ]; then
        echo "Extracting ${tarfile} to $GCC_VERSION/$subfolder"
        mkdir -p "$GCC_VERSION/$subfolder"
        tar -x --strip-components=1 -f "$tarfile" -C "$GCC_VERSION/$subfolder"
    fi
}

# 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 [ $USE_NEWLIB -ne 0 ]; then
    wget -nc -O newlib-master.zip https://github.com/bminor/newlib/archive/master.zip || true
    unzip -qo newlib-master.zip
else
    wget -nc https://www.kernel.org/pub/linux/kernel/v3.x/$LINUX_KERNEL_VERSION.tar.xz
    wget -nc https://ftp.gnu.org/gnu/glibc/$GLIBC_VERSION.tar.xz
fi
wget -nc https://ftp.gnu.org/gnu/mpfr/$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 packages
extract                     $BINUTILS_VERSION.tar.gz
extract                     $GCC_VERSION.tar.gz
extract_to_gcc_folder       $MPFR_VERSION.tar.xz
extract_to_gcc_folder       $GMP_VERSION.tar.xz
extract_to_gcc_folder       $MPC_VERSION.tar.gz
extract_to_gcc_folder       $ISL_VERSION.tar.bz2
extract_to_gcc_folder       $CLOOG_VERSION.tar.gz
if [ $USE_NEWLIB -eq 0 ]; then
    extract                 $LINUX_KERNEL_VERSION.tar.xz || true
    extract                 $GLIBC_VERSION.tar.xz || true
    if [ $HAS_SYMLINK -eq 0 ]; then
        cp $GLIBC_VERSION/benchtests/strcoll-inputs/filelist#en_US.UTF-8 $GLIBC_VERSION/benchtests/strcoll-inputs/filelist#C
    fi
#else
#    extract                 $NEWLIB_VERSION.tar.gz
fi

# Step 1. Binutils
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
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
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 [ $USE_NEWLIB -ne 0 ]; then
    # Steps 4-6: Newlib
    mkdir -p build-newlib
    cd build-newlib
    ../newlib-master/configure --prefix=$INSTALL_PATH --target=$TARGET $CONFIGURATION_OPTIONS
    make $PARALLEL_MAKE
    make install
    cd ..
else
    # Step 4. Standard C Library Headers and Startup Files
    cd $GLIBC_VERSION
    if [ $BUILD_CI_FS -ne 0 ]; then
        # Replace "oS" with "oZ" to avoid filename clashes
        sed -i 's/.oS)/.oZ)/g; s/.oS$/.oZ/g; s/.oS =/.oZ =/g'       Makeconfig
        sed -i 's/.oS,/.oZ,/g; s/.oS +=/.oZ +=/g; s/.oS)/.oZ)/g'    Makerules 
        sed -i 's/.oS)/.oZ)/g; s/.oS,/.oZ,/g'                       extra-lib.mk        
        sed -i 's/.oS)/.oZ)/g'                                      nptl/Makefile
        sed -i 's/.oS +=/.oZ +=/g'                                  sysdeps/i386/i686/Makefile
        sed -i 's/.oS,/.oZ,/g'                                      sysdeps/ieee754/ldbl-opt/Makefile
        sed -i 's/.oS +=/.oZ +=/g'                                  sysdeps/sparc/sparc32/sparcv9/Makefile
        sed -i 's/.oS +=/.oZ +=/g'                                  sysdeps/sparc/sparc64/Makefile
        sed -i 's/,oS}/,oZ}/g'                                      scripts/check-local-headers.sh
    fi
    if [ $HAS_SYMLINK -eq 0 ]; then
        # use copy because the rellns-sh has issues under msys2
        sed -i 's|$(LN_S) `$(..)scripts/rellns-sh -p $< $@` $@|cp -p $< $@|' Makerules
    fi
    cd ..
    mkdir -p build-glibc
    cd build-glibc
    ../$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
    cd build-gcc
    make $PARALLEL_MAKE all-target-libgcc
    make install-target-libgcc
    cd ..

    # Step 6. Standard C Library & the rest of Glibc
    cd build-glibc
    make $PARALLEL_MAKE
    make install
    cd ..
fi

# Step 7. Standard C++ Library & the rest of GCC
cd build-gcc
make $PARALLEL_MAKE all
make install
cd ..

trap - EXIT
echo 'Success!'