Build script for a GNU toolchain

build-arm-none-eabi.sh

#!/bin/bash

# What this script does:
# - downloads sources of GCC, Binutils, and GDB;
# - unpacks them;
# - configures for local static build;
# - builds;
# - packs into (primitive) .deb files.

set -e

MIRROR=""
TARGET=arm-none-eabi
BUILD_DIR="build"
DIST_DIR="dist"
JOBS=$(nproc)

GCC_VERSION=10.2.0
BINUTILS_VERSION=2.35
GDB_VERSION=9.2

GMP_VERSION=6.2.0
MPFR_VERSION=4.1.0
MPC_VERSION=1.1.0

function create_package() {
	NAME=$1
	VERSION=$2
	DESCRIPTION=$3

	pushd "$DIST_DIR/$NAME"
	INSTALLED_SIZE=$(du -s -BK --apparent-size --exclude='./DEBIAN/*' . | cut -f1)
	INSTALLED_SIZE=${INSTALLED_SIZE%?}

	cat > ./DEBIAN/control <<- EOM
		Package: $NAME-$TARGET
		Version: $VERSION
		Architecture: $(dpkg-architecture -q DEB_HOST_ARCH)
		Maintainer: none
		Installed-Size: $INSTALLED_SIZE
		Description: $DESCRIPTION
	EOM

	find . -path ./DEBIAN -prune -o -type f -exec md5sum '{}' \; > ./DEBIAN/md5sums

	dpkg-deb --build -Zxz . ..
	popd
}

mkdir -p src
mkdir -p "$BUILD_DIR"/{gmp,mpfr,mpc,binutils,gcc,gdb}
mkdir -p "$DIST_DIR"/{binutils,gcc,gdb}/DEBIAN

PREFIX=$(realpath "$BUILD_DIR"/usr)
DIST_BINUTILS=$(realpath "$DIST_DIR"/binutils/usr)
DIST_GCC=$(realpath "$DIST_DIR"/gcc/usr)
DIST_GDB=$(realpath "$DIST_DIR"/gdb/usr)

pushd src

wget -nc -B "$MIRROR" -i - << EOM
	gcc/gcc-$GCC_VERSION/gcc-$GCC_VERSION.tar.xz
	gmp/gmp-$GMP_VERSION.tar.xz
	mpfr/mpfr-$MPFR_VERSION.tar.xz
	mpc/mpc-$MPC_VERSION.tar.gz
	binutils/binutils-$BINUTILS_VERSION.tar.xz
	gdb/gdb-$GDB_VERSION.tar.xz
EOM

for file in *.tar.*; do
	tar -xf "$file" --skip-old-files 2>/dev/null
done

popd

pushd build/gmp

../../src/gmp-$GMP_VERSION/configure \
	--prefix="$PREFIX" \
	--disable-shared
make -j"$JOBS"
make install

popd

pushd build/mpfr

../../src/mpfr-$MPFR_VERSION/configure \
	--prefix="$PREFIX" \
	--disable-shared \
	--with-gmp="$PREFIX"
make -j"$JOBS"
make install

popd

pushd build/mpc

../../src/mpc-$MPC_VERSION/configure \
	--prefix="$PREFIX" \
	--disable-shared \
	--with-gmp="$PREFIX" \
	--with-mpfr="$PREFIX"
make -j"$JOBS"
make install

popd

pushd build/binutils

../../src/binutils-$BINUTILS_VERSION/configure \
	--target=$TARGET \
	--prefix="$DIST_BINUTILS" \
	--disable-libquadmath \
	--disable-libstdcxx \
	--disable-nls \
	--disable-shared \
	--enable-lto \
	--with-gmp="$PREFIX" \
	--with-mpfr="$PREFIX" \
	--with-mpc="$PREFIX" \
	--with-sysroot="$DIST_BINUTILS"/$TARGET
make -j"$JOBS"
make install-strip

popd

rm -rf "$DIST_BINUTILS/share/info"
create_package binutils $BINUTILS_VERSION "Binutils for arm-none-eabi"

pushd build/gcc

# as, ld, ar, and other binutils programs will not be found without
# at least a proper path in --with-build-time-tools
../../src/gcc-$GCC_VERSION/configure \
	--target=$TARGET \
	--prefix="$DIST_GCC" \
	--with-sysroot="$DIST_GCC"/$TARGET \
	--with-as="$DIST_BINUTILS/$TARGET/bin/as" \
	--with-ld="$DIST_BINUTILS/$TARGET/bin/ld" \
	--with-build-time-tools="$DIST_BINUTILS/$TARGET/bin" \
	--enable-languages=c \
	--enable-plugins \
	--enable-lto \
	--disable-bootstrap \
	--disable-decimal-float \
	--disable-libffi \
	--disable-libgomp \
	--disable-libmudflap \
	--disable-libquadmath \
	--disable-libssp \
	--disable-libstdcxx-pch \
	--disable-nls \
	--disable-shared \
	--disable-threads \
	--disable-tls \
	--with-gnu-as \
	--with-gnu-ld \
	--without-headers \
	--disable-libstdcxx \
	--with-newlib \
	--with-gmp="$PREFIX" \
	--with-mpfr="$PREFIX" \
	--with-mpc="$PREFIX"
make -j"$JOBS" all-gcc all-target-libgcc
make install-strip-gcc install-target-libgcc

popd

rm -rf "$DIST_GCC/share/info"
create_package gcc $GCC_VERSION "GNU CC for cross-compiling to arm-none-eabi"

pushd build/gdb

# python3.6-dev package is needed
# --with-gdb-datadir option moves datafiles to a target-specific
# directory so as not to conflict with other gdbs
../../src/gdb-$GDB_VERSION/configure \
	--target=$TARGET \
	--prefix="$DIST_GDB" \
	--with-gdb-datadir="$DIST_GDB/arm-none-eabi/share/gdb" \
	--disable-nls \
	--disable-sim \
	--disable-gas \
	--disable-binutils \
	--disable-ld \
	--disable-gprof \
	--with-curses \
	--enable-tui \
	--with-libmpfr-prefix="$PREFIX" \
	--with-python=/usr/bin/python3.6 \
	--with-gmp="$PREFIX" \
	--with-mpfr="$PREFIX" \
	--with-mpc="$PREFIX"
make -j"$JOBS"
make install-strip

popd

rm -rf "$DIST_GDB/share/info"
create_package gdb $GDB_VERSION "GNU Debugger for arm-none-eabi"