Preparation

Create a new case-sensitive hard disk partition with the disk tool of mac. Follow-up suggestions are made in this partition. Otherwise, there will be errors such as file missing. Running scripts requires gnu-sed, not sed on OSX, so you need to download one first, modify PATH variables, and use ln to establish a link sed to gsed.

brew install gnu-sed
export PATH=/usr/local/Cellar/gnu-sed/4.7/bin:$PATH

Some other prerequisite dependencies

ulimit -n 8192
brew install gawk wget autoconf gettext

Run script

according to here Some modifications have been made to the script, mainly to change the version of gcc, with the option of disable-werror added. The modifications are as follows:

#! /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=/Volumes/Develop/cross
TARGET=aarch64-linux
USE_NEWLIB=0
LINUX_ARCH=arm64
CONFIGURATION_OPTIONS="--disable-multilib --disable-werror" # --disable-threads --disable-shared
PARALLEL_MAKE=
BINUTILS_VERSION=binutils-2.24
GCC_VERSION=gcc-4.8.5
LINUX_KERNEL_VERSION=linux-3.17.2
GLIBC_VERSION=glibc-2.20
MPFR_VERSION=mpfr-3.1.2
GMP_VERSION=gmp-6.0.0a
MPC_VERSION=mpc-1.0.2
ISL_VERSION=isl-0.12.2
CLOOG_VERSION=cloog-0.18.1
export PATH=$INSTALL_PATH/bin:$PATH

# 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 everything
#for f in *.tar*; do 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 ..

# extra flags and env variables are needed to get this to compile on OSX
export BUILD_ALL_BASE_DIR=`pwd`
export HOST_EXTRACFLAGS="-I$BUILD_ALL_BASE_DIR/endian"

# these are needed for gettext and assuming that it was installed using brew
export BUILD_CPPFLAGS='-I/usr/local/Cellar/gettext/0.20.1/include'
export BUILD_LDFLAGS='-L/usr/local/Cellar/gettext/0.20.1/lib -lintl'

# 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 $PARALLEL_MAKE
    make install
    cd ..
else
    # Step 4. Standard C Library Headers and Startup Files
    mkdir -p build-glibc
    cd build-glibc
    ../$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!'