cross-toolchain/altcross.sh

#!/bin/bash
set -e
set -x

KERNEL_VERSION='5.4'
BINUTILS_VERSION='2.31.1'
GCC_VERSION='8.4.1-20200305'
GLIBC_VERSION='2.27-alt13'

KERNEL_SOURCE="/usr/src/kernel/sources/kernel-source-${KERNEL_VERSION}.tar"
BINUTILS_SOURCE="/usr/src/binutils-source/binutils-${BINUTILS_VERSION}.tar"
GCC_SOURCE="/usr/src/gcc-source/gcc-${GCC_VERSION}.tar"
GLIBC_SOURCE="/usr/src/glibc-source/glibc-${GLIBC_VERSION}.tar"


TARGET=aarch64-linux-gnu

GCC_MAJOR_VERSION="${GCC_VERSION%%.*}"

BUILDDIR="`pwd`/build"
SRCDIR="`pwd`/src"
INSTALLDIR="`pwd`/inst/altcross-gcc-${GCC_VERSION}"
SYSROOT=/$TARGET/libc
SYSROOTDIR="$INSTALLDIR/$SYSROOT"

mkdir -p -m755 "$SRCDIR"
cd "$SRCDIR"

tar xf "$KERNEL_SOURCE"
tar xf "$BINUTILS_SOURCE"
tar xf "$GCC_SOURCE"
tar xf "$GLIBC_SOURCE"

cd "gcc-${GCC_VERSION}"
sed -i contrib/download_prerequisites -e '/base_url=/s/ftp/http/'
./contrib/download_prerequisites

mkdir -p -m755 "$INSTALLDIR/bin"
export PATH="$INSTALLDIR/bin:/usr/lib/ccache:$PATH"
unset LD_LIBRARY_PATH

mkdir -p -m755 \
	"$BUILDDIR/obj_binutils" \
	"$BUILDDIR/obj_gcc" \
	"$BUILDDIR/obj_glibc" \
	"$BUILDDIR/obj_kernel" \

make -j$(nproc) \
	-C "$SRCDIR/kernel-source-${KERNEL_VERSION}" \
	O="$BUILDDIR/obj_kernel" \
	ARCH=arm64 \
	INSTALL_HDR_PATH="$SYSROOTDIR/usr" \
	headers_install

# binutils

cd "$BUILDDIR/obj_binutils"
../../src/binutils-${BINUTILS_VERSION}/configure \
	--target="$TARGET" \
	--prefix= \
	--with-sysroot="$SYSROOT" \
	--with-build-sysroot="$SYSROOTDIR" \
	--disable-multilib

make -j$(nproc)
make -j$(nproc) install DESTDIR="$INSTALLDIR"

# gcc 
cd "$BUILDDIR/obj_gcc"
../../src/gcc-${GCC_VERSION}/configure \
	--prefix= \
	--target=$TARGET \
	--enable-languages=c,c++ \
	--enable-version-specific-runtime-libs \
	--with-sysroot="$SYSROOT" \
	--with-build-sysroot="$SYSROOTDIR" \
	--with-gcc-major-version-only \
	--disable-multilib

# compiler only
make -j$(nproc) all-gcc
make -j$(nproc) install-gcc DESTDIR="$INSTALLDIR"


# glibc

cd "$BUILDDIR/obj_glibc"
../../src/glibc-${GLIBC_VERSION}/configure \
	--prefix=/usr \
	--target=$TARGET \
	--host=$TARGET \
	--build="$MACHTYPE" \
	--with-sysroot="$SYSROOT" \
       	--with-build-sysroot="$SYSROOTDIR" \
	--with-headers="$SYSROOTDIR"/usr/include \
	--with-lib="$SYSROOTDIR"/usr/lib \
	--disable-multilib \
	--disable-crypt \
	libc_cv_forced_unwind=yes

# glibc: headers + C runtime bits
make -j$(nproc) install-bootstrap-headers=yes install-headers DESTDIR="$SYSROOTDIR"
make -j$(nproc) csu/subdir_lib
install -d -m755 "$SYSROOTDIR"/usr/lib
install csu/crt1.o csu/crti.o csu/crtn.o "$SYSROOTDIR"/usr/lib
$TARGET-gcc -nostdlib -nostartfiles -shared -x c /dev/null -o "$SYSROOTDIR"/usr/lib/libc.so
touch "$SYSROOTDIR"/usr/include/gnu/stubs.h "$SYSROOTDIR"/usr/include/bits/stdio_lim.h

# GCC: runtime (libgcc)
cd "$BUILDDIR/obj_gcc"
make -j$(nproc) all-target-libgcc
make -j$(nproc) install-target-libgcc DESTDIR="$INSTALLDIR"

# finish off glibc 
cd "$BUILDDIR/obj_glibc"
make -j$(nproc)
make install DESTDIR="$SYSROOTDIR"

# finish off GCC
cd "$BUILDDIR/obj_gcc"
make -j$(nproc)
make -j$(nproc) install DESTDIR="$INSTALLDIR"

# set /lib64/ld-linux-aarch64.so.1 as ELF interpreter
$INSTALLDIR/bin/${TARGET}-gcc -dumpspecs > $BUILDDIR/specs
sed -e 's;/lib/ld-linux-aarch64;/lib64/ld-linux-aarch64;g' -i $BUILDDIR/specs
mv $BUILDDIR/specs "$INSTALLDIR/lib/gcc/$TARGET/${GCC_MAJOR_VERSION}/"

# relocate libgcc_s
mv $INSTALLDIR/lib/gcc/$TARGET/lib64/libgcc_s.so* "$INSTALLDIR/lib/gcc/$TARGET/${GCC_MAJOR_VERSION}/"
rmdir "$INSTALLDIR/lib/gcc/$TARGET/lib64"