#!/bin/bash

BINUTILS=2.46.0
GCC_VERSION=16.1.0
GLIBC_VERSION=2.43

DISTRO_SPEC="x221e"

DESTDIR_STAGE0="${HOME}/opt/cross"
SYSROOT_LOC="${HOME}/opt/cross/"
HEADERS_LOC="${HOME}/opt/cross/usr/include"

BINUTILS_CONF_DIR="binutils-conf"
GLIBC_CONF_DIR="glibc-conf"
GCC_CONF_DIR="gcc-conf"
LIBSTDCXX_CONF_DIR="libstdc++-conf"

function binutils_configure {
    CURRDIR=$(pwd)

    compiler=$1

    conf_flags=("${@:2}")

    if [[ $compiler == "distro" ]]
    then
	compiler=x86_64-${DISTRO_SPEC}-linux-gnu-gcc
    elif [[ $compiler == "default" ]]
    then
	 compiler=x86_64-linux-gnu-gcc
    fi
    
    mkdir "${BINUTILS_CONF_DIR}"
    cd "${BINUTILS_CONF_DIR}"
    
    CC=${compiler} ../binutils-${BINUTILS}/configure --prefix=/usr\
	    --disable-nls\
	    --disable-multilib\
	    --target=x86_64-${DISTRO_SPEC}-linux-gnu\
	    --with-sysroot=${SYSROOT_LOC}\
	    --disable-werror \
	    "${conf_flags[@]}"
    
    if [ $? -eq 0 ]
    then
	echo "Succesfully configured binutils!"
    else
	echo "Configuration of binutils failed!!! With error code: " $?
	exit 1
    fi

    cd ${CURRDIR}
}

function binutils_make {
    echo "Building binutils"

    arg=$1

    CURRDIR=$(pwd)

    if [[ ! -e "${BINUTILS_CONF_DIR}" || !  -d "${BINUTILS_CONF_DIR}" ]]
    then
	echo "Could not find the binutils-conf directory!"
	exit 1
    fi

    cd "${BINUTILS_CONF_DIR}"
    
    make ${arg} -j$(nproc)

    if [ $? -ne 0 ]
    then
	echo "Could not '${arg}' binutils!!! With error code: " $?
	exit 1
    fi
    
    echo "Succesfully completed '${arg}' in binutils!"
    cd "${CURRDIR}"
}

function gcc_configure {

    gcc_flags=("$@")
    
    currdir=$(pwd)
    
    mkdir "${GCC_CONF_DIR}"
    cd "${GCC_CONF_DIR}"

    echo -e "building gcc with flags: ${gcc_flags}" 

    ../gcc-${GCC_VERSION}/configure\
	   --disable-multilib\
	   --disable-nls\
	   --target=x86_64-${DISTRO_SPEC}-linux-gnu\
	   --disable-werror\
    	   "${gcc_flags[@]}"
	
    if [ $? -eq 0 ]
    then
	echo -e "Succesfully configured gcc!"
    else
	echo -e "Configuration of binutils failed!!! With error code: " $?
	exit 1
    fi
    
    cd "${currdir}"
}

function gcc_make {
    arg=$1

    currdir=$(pwd)
    
    if [[ ! -e "${GCC_CONF_DIR}" || !  -d "${GCC_CONF_DIR}" ]]
    then
	echo -e "Could not find the binutils-conf directory!"
	exit 1
    fi

    cd "${GCC_CONF_DIR}"
    
    make ${arg} -j$(nproc)
    
    if [ $? -eq 0 ]
    then
	echo -e "Succesfully built all-gcc!"
    else
	echo -e "make '${arg}' failed!!! With error code: " $?
	exit 1
    fi

    cd "${currdir}"
}

function libstdc++_configure {
    gcc_flags=("$@")
    
    currdir=$(pwd)
    
    mkdir "${LIBSTDCXX_CONF_DIR}"
    cd "${LIBSTDCXX_CONF_DIR}"

    echo -e "building libstdc++ with flags: ${gcc_flags}" 

    ../gcc-${GCC_VERSION}/libstdc++-v3/configure\
	   --disable-multilib\
	   --disable-nls\
	   --target=x86_64-${DISTRO_SPEC}-linux-gnu\
	   --disable-werror\
	   --disable-libstdcxx-pch\
	   --with-gxx-include-dir=${DESTDIR_STAGE0}/usr/x86_64-${DISTRO_SPEC}-linux-gnu/include/${GCC-VERSION}/
    	   "${gcc_flags[@]}"
	
    if [ $? -eq 0 ]
    then
	echo -e "Succesfully configured libstdcxx!"
    else
	echo -e "Configuration of binutils failed!!! With error code: " $?
	exit 1
    fi
    
    cd "${currdir}"

}

function libstdc++_make {
    arg=$1

    currdir=$(pwd)
    
    if [[ ! -e "${LIBSTDCXX_CONF_DIR}" || !  -d "${LIBSTDCXX_CONF_DIR}" ]]
    then
	echo -e "Could not find the ${LIBSTDCXX_CONF_DIR} directory!"
	exit 1
    fi

    cd "${GCC_CONF_DIR}"
    
    make ${arg} -j$(nproc)
    
    if [ $? -eq 0 ]
    then
	echo -e "Succesfully built '${arg}'!"
    else
	echo -e "make '${arg}' failed!!! With error code: " $?
	exit 1
    fi

    cd "${currdir}"

}

function glibc_configure {

    compiler="$1"
    
    conf_flags=("${@:2}")

    if [[ $compiler == "distro" ]]
    then
	compiler=x86_64-${DISTRO_SPEC}-linux-gnu-gcc
    fi
    
    currdir=$(pwd)

    mkdir ${GLIBC_CONF_DIR}
    cd ${GLIBC_CONF_DIR}

    echo "rootsbindir=/usr/sbin" > configparms
    
    CC=${compiler} ../glibc-${GLIBC_VERSION}/configure\
	      --host=x86_64-${DISTRO_SPEC}-linux-gnu\
	      --build=x86_64-linux-gnu\
	      --with-headers="${HEADERS_LOC}"\
	      --disable-werror\
	      --disable-ncsd\
	      libc_cv_slibdir=/usr/lib\
	      "${conf_flags[@]}"
    
    cd "${currdir}"
}

function glibc_make {
    arg=$1

    currdir=$(pwd)
    
    if [[ ! -e "${GLIBC_CONF_DIR}" || !  -d "${GLIBC_CONF_DIR}" ]]
    then
	echo -e "Could not find the '${GLIBC_CONF_DIR} directory!"
	exit 1
    fi
    
    cd ${GLIBC_CONF_DIR}

    make ${arg} -j$(nproc)

    if [ $? -eq 0 ]
    then
	echo -e "Succesful '${arg}'!"
    else
	echo -e "make '${arg}' failed!!! With error code: " $?
	exit 1
    fi
    
    cd "${currdir}"
}


function stage0_binutils {
    rm -rf "${BINUTILS_CONF_DIR}"

    conf_flags=(
	--prefix=/usr
    )
    
    binutils_configure "default" "${conf_flags[@]}"
    binutils_make
    binutils_make "DESTDIR=${DESTDIR_STAGE0} install"
    echo "Stage 0 binutils completed." 
}

function stage0_gcc {
    rm -rf "${GCC_CONF_DIR}"
    
    conf_flags=(
	--prefix=/tools
	--with-sysroot="${SYSROOT_LOC}"
	--with-glibc-version=2.43
	--with-newlib
	--without-headers
	--enable-languages=c,c++
	--disable-shared
	--disable-threads
	--disable-gcov
	--disable-libgcov
	--disable-libatomic
	--disable-libgomp
	--disable-libssp
	--disable-libvtv
	--disable-libstdcxx
	--disable-libquadmath
	--disable-libssp
    )
    
    gcc_configure "${conf_flags[@]}"
    gcc_make all-gcc
    gcc_make all-target-libgcc
    gcc_make "DESTDIR=${DESTDIR_STAGE0} install-gcc"
    gcc_make "DESTDIR=${DESTDIR_STAGE0} install-target-libgcc"
    echo "Stage 0 gcc completed."
}

function stage0_glibc {
    rm -rf "${GLIBC_CONF_DIR}"

    conf_flags=(
	--prefix=/usr
    )
    
    glibc_configure "distro" "${conf_flags[@]}"
    glibc_make
    glibc_make "DESTDIR=${DESTDIR_STAGE0} install"
}

function stage0 {
    stage0_binutils
    stage0_gcc
    stage0_glibc
    echo -e "Stage 0 completed."
}

function stage1_binutils {
    rm -rf "${BINUTILS_CONF_DIR}"

    conf_flags=(
	--prefix=/usr
    )

    binutils_configure "distro" "${conf_flags[@]}"
    binutils_make
    binutils_make "DESTDIR=${DESTDIR_STAGE0} install"
}

function stage1_gcc {
    rm -rf "${GCC_CONF_DIR}"
    
    conf_flags=(
	--prefix=/usr
	--enable-languages=c,c++
	--enable-threads=posix
	--enable-default-pie
	--enable-default-ssp
	--enable-shared
	--with-sysroot="${SYSROOT_LOC}"
	--with-build-sysroot="${SYSROOT_LOC}"	
	--disable-libvtv
	--disable-libssp
	--disable-libgomp
	--disable-quadmath
    )
    
    gcc_configure "${conf_flags[@]}"
    gcc_make
    gcc_make "DESTDIR=${DESTDIR_STAGE0} install"
}

function stage1_glibc {
    rm -rf "${GLIBC_CONF_DIR}"

    conf_flags=(
	--prefix=/usr
    )
    
    glibc_configure "distro" "${conf_flags[@]}"
    glibc_make
    glibc_make "DESTDIR=${DESTDIR_STAGE0} install"
}

function stage1_libstdc++ {
    libstdc++_configure "distro"
    libstdc++_make
    libstdc++_make "DESTDIR=${DESTDIR_STAGE0} install" 
    echo -e "Libstdc++-3 is installed!"
}

function stage1 {
    stage1_gcc
    stage1_glibc
    stage1_libstdc++
    echo -e "Cross compiler installed!"   
}

case "$1" in
    "stage0") stage0 ;;
    "stage0-gcc") stage0_gcc ;;
    "stage0-binutils") stage0_binutils ;;
    "stage0-glibc") stage0_glibc ;;
    "stage1") stage1 ;;
    "stage1-gcc") stage1_gcc ;;
    "stage1-binutils") stage1_binutils ;;
    "stage1-glibc") stage1_glibc ;;
    "stage1-libstdc++") stage1_libstdc++ ;;
    "install") stage0 && stage1 ;;
    *) echo -e "you must supply an argument!" && exit 1 ;;
esac