#! /usr/bin/bash
sudo apt update &&\
     apt install -y \
	build-essential \
	bison\
	flex\
	libgmp3-dev\
	libmpc-dev\
	libmpfr-dev\
	texinfo

BINUTIL_VERSION=2.37
BINUTIL_URL=https://ftp.gnu.org/gnu/binutils/binutils-2.37.tar.xz

GCC_VERSION=11.2.0
GCC_URL=https://ftp.gnu.org/gnu/gcc/gcc-11.2.0/gcc-11.2.0.tar.xz

GCC_SRC="gcc-${GCC_VERSION}"
BINUTIL_SRC="binutils-${BINUTIL_VERSION}"

# download gcc & binutil src code

export PREFIX="$HOME/cross-compiler"
export TARGET=i686-elf
export PATH="$PREFIX/bin:$PATH"

mkdir -p "${PREFIX}"
mkdir -p "${HOME}/toolchain/binutils-build"
mkdir -p "${HOME}/toolchain/gcc-build"

cd "${HOME}/toolchain"

if [ ! -d "${HOME}/toolchain/${GCC_SRC}" ]
then
	(wget -O "${GCC_SRC}.tar" ${GCC_URL} \
		&& tar -xf "${GCC_SRC}.tar") || exit
	rm -f "${GCC_SRC}.tar"
else
	echo "skip downloading gcc"
fi

if [ ! -d "${HOME}/toolchain/${BINUTIL_SRC}" ]
then
	(wget -O "${BINUTIL_SRC}.tar" ${BINUTIL_URL} \
		&& tar -xf "${BINUTIL_SRC}.tar") || exit
	rm -f "${BINUTIL_SRC}.tar"
else
	echo "skip downloading binutils"
fi

echo "Building binutils"

cd "${HOME}/toolchain/binutils-build"

("${HOME}/toolchain/${BINUTIL_SRC}/configure" --target=$TARGET --prefix="$PREFIX" \
	--with-sysroot --disable-nls --disable-werror) || exit

(make && make install) || exit

echo "Binutils build successfully!"

echo "Building GCC"

cd "${HOME}/toolchain/gcc-build"

which -- "$TARGET-as" || echo "$TARGET-as is not in the PATH"

("${HOME}/toolchain/${GCC_SRC}/configure" --target=$TARGET --prefix="$PREFIX" \
	--disable-nls --enable-languages=c,c++ --without-headers) || exit

(make all-gcc &&\
 make all-target-libgcc &&\
 make install-gcc &&\
 make install-target-libgcc) || exit

echo "done"