#!/bin/bash
# mingw-w64-build - download and build mingw-w64 toolchain
#
# Project: https://github.com/bradleysepos/mingw-w64-build
# License: MIT

# checks for required external tools
function check_dependencies {  # check_dependencies $DEP1 $DEP2 ...
    local DEPS ERRORS
    DEPS=("${@}");
    ERRORS=()
    for DEP in ${DEPS[@]}; do
        if echo "${DEP}" | grep '/' >/dev/null 2>&1 && [[ ! -x "${DEP}" ]]; then
            ERRORS+=("${DEP}")
        elif ! hash "${DEP}" >/dev/null 2>&1; then
            ERRORS+=("${DEP}")
        fi
    done
    if [[ "${#ERRORS[@]}" -ne 0 ]]; then
        echo "dependencies: ${DEPS[@]}"
        echo "unable to find command(s): ${ERRORS[*]}" >&2
        return 1
    fi
}

# downloads from one or more urls
function download_url {  # download_url $VERBOSE $FILE $URLS
    local VERBOSE FILE URLS I FAILED
    OPTIND=1
    VERBOSE="${1}"
    FILE="${2}"
    shift 2
    URLS=("${@}")
    if [[ "${#URLS[@]}" -eq 0 ]] || [[ "${URLS[0]:-}" == "" ]]; then
        echo "url not specified for download" >&2
        return 1
    fi
    if [[ "${FILE:-}" == "" ]]; then
        echo "output path not specified for download: ${FILE}" >&2
        return 1
    fi
    FAILED=()
    for I in "${!URLS[@]}"; do
        if ! curl --head -Lf --connect-timeout 30 "${URLS[I]}" >/dev/null 2>&1; then
            FAILED+=("${URLS[I]}")
            if [[ "$(( ${I} + 1 ))" -lt "${#URLS[@]}" ]]; then
                continue
            else
                echo "unable to download from urls: ${FAILED[@]}" >&2
                echo "unable to download to file: ${FILE}" >&2
                return 1
            fi
        fi
        if ! touch "${FILE}" >/dev/null 2>&1; then
            echo "unable to create path: ${FILE}" >&2
            return 1
        fi
        if [[ "${VERBOSE:-}" == true ]]; then
            echo "curl -Lf --connect-timeout 30 \"${URLS[I]}\" -o \"${FILE}\""
        fi
        if ! curl -Lf --connect-timeout 30 "${URLS[I]}" -o "${FILE}"; then
            FAILED+=("${URLS[I]}")
            if [[ "$(( ${I} + 1 ))" -lt "${#URLS[@]}" ]]; then
                continue
            else
                echo "unable to download from urls: ${FAILED[@]}" >&2
                echo "unable to download to file: ${FILE}" >&2
                return 1
            fi
        fi
    done
}

# builds mingw-w64
function mingw-w64-build {  # mingw-w64-build $TARGET_PARAM $TARGET_DIR
    set -o pipefail

    # dependencies
    local DEPS
    DEPS=("bison" "bzip2" "curl" "flex" "g++" "gcc" "gunzip" "m4" "make" "pax" "yasm")
    check_dependencies "${DEPS[@]}" || return 1

    # package names
    local CONFIG_NAME BINUTILS_NAME MINGW_W64_NAME GMP_NAME MPFR_NAME MPC_NAME ISL_NAME GCC_NAME NAMES
    CONFIG_NAME="config"
    BINUTILS_NAME="binutils"
    MINGW_W64_NAME="mingw-w64"
    GMP_NAME="gmp"
    MPFR_NAME="mpfr"
    MPC_NAME="mpc"
    ISL_NAME="isl"
    GCC_NAME="gcc"
    NAMES=("${CONFIG_NAME}" "${BINUTILS_NAME}" "${MINGW_W64_NAME}" "${GMP_NAME}" "${MPFR_NAME}" "${MPC_NAME}" "${ISL_NAME}" "${GCC_NAME}")

    # versions
    local CONFIG_VER BINUTILS_VER MINGW_W64_VER GMP_VER MPFR_VER MPC_VER ISL_VER GCC_VER
    CONFIG_VER="ddd7f33"
    BINUTILS_VER="2.26"
    #MINGW_W64_VER="4.0.6"
    MINGW_W64_VER="5.0-rc2"
    GMP_VER="6.1.0"
    MPFR_VER="3.1.4"
    MPC_VER="1.0.3"
    ISL_VER="0.14"
    GCC_VER="5.4.0"
    #ISL_VER="0.12.2"
    #GCC_VER="4.9.2"

    # filenames
    local CONFIG_PKG BINUTILS_PKG MINGW_W64_PKG GMP_PKG MPFR_PKG MPC_PKG ISL_PKG GCC_PKG PKGS
    CONFIG_PKG="config-${CONFIG_VER}.tar.gz"
    BINUTILS_PKG="binutils-${BINUTILS_VER}.tar.bz2"
    MINGW_W64_PKG="mingw-w64-v${MINGW_W64_VER}.tar.bz2"
    GMP_PKG="gmp-${GMP_VER}.tar.bz2"
    MPFR_PKG="mpfr-${MPFR_VER}.tar.gz"
    MPC_PKG="mpc-${MPC_VER}.tar.gz"
    ISL_PKG="isl-${ISL_VER}.tar.bz2"
    GCC_PKG="gcc-${GCC_VER}.tar.bz2"
    PKGS=("${CONFIG_PKG}" "${BINUTILS_PKG}" "${MINGW_W64_PKG}" "${GMP_PKG}" "${MPFR_PKG}" "${MPC_PKG}" "${ISL_PKG}" "${GCC_PKG}")

    # urls
    local CONFIG_URLS BINUTILS_URLS MINGW_W64_URLS GMP_URLS MPFR_URLS MPC_URLS ISL_URLS GCC_URLS URLS_VARNAMES
    CONFIG_URLS=("http://git.savannah.gnu.org/gitweb/?p=config.git;a=snapshot;h=${CONFIG_VER};sf=tgz")
    BINUTILS_URLS=("https://ftp.gnu.org/gnu/binutils/binutils-${BINUTILS_VER}.tar.bz2")
    MINGW_W64_URLS=("http://downloads.sourceforge.net/project/mingw-w64/mingw-w64/mingw-w64-release/mingw-w64-v${MINGW_W64_VER}.tar.bz2")
    GMP_URLS=("https://ftp.gnu.org/gnu/gmp/gmp-${GMP_VER}.tar.bz2")
    MPFR_URLS=("https://ftp.gnu.org/gnu/mpfr/mpfr-${MPFR_VER}.tar.gz")
    MPC_URLS=("https://ftp.gnu.org/gnu/mpc/mpc-${MPC_VER}.tar.gz")
    ISL_URLS=("ftp://gcc.gnu.org/pub/gcc/infrastructure/isl-${ISL_VER}.tar.bz2" "http://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/infrastructure/isl-${ISL_VER}.tar.bz2")
    GCC_URLS=("https://ftp.gnu.org/gnu/gcc/gcc-${GCC_VER}/gcc-${GCC_VER}.tar.bz2")
    URLS_VARNAMES=('CONFIG_URLS' 'BINUTILS_URLS' 'MINGW_W64_URLS' 'GMP_URLS' 'MPFR_URLS' 'MPC_URLS' 'ISL_URLS' 'GCC_URLS')

    # internal vars
    local NAME VERSION SELF SELF_NAME HELP
    NAME="mingw-w64-build"
    VERSION="2.2.0"
    SELF="${BASH_SOURCE[0]}"
    SELF_NAME=$(basename "${SELF}")
    HELP="\
usage: ${SELF_NAME} target [install-dir]
targets:
  i686
  i686.clean
  i686.distclean
  x86_64
  x86_64.clean
  x86_64.distclean
default install-dir: ${HOME}/toolchains/mingw-w64-${MINGW_W64_VER}-gcc-${GCC_VER}"

    # args
    local TARGET_PARAM TARGET_DIR
    TARGET_PARAM="${1}"
    TARGET_DIR="${2}"
    if [[ "${TARGET_PARAM:-}" == "" ]]; then
        echo -e "${HELP}"
        echo "no target specified" >&2
        return 1
    fi
    if [[ "${TARGET_DIR:-}" == "" ]]; then
        TARGET_DIR="${HOME}/toolchains/mingw-w64-${MINGW_W64_VER}-gcc-${GCC_VER}"
    fi

    # target and prefix
    local TARGET_i686 TARGET_x86_64 PREFIX_i686 PREFIX_x86_64 TARGET PREFIX
    TARGET_i686="i686-w64-mingw32"
    TARGET_x86_64="x86_64-w64-mingw32"
    PREFIX_i686="mingw-w64-i686"
    PREFIX_x86_64="mingw-w64-x86_64"
    case "${TARGET_PARAM}" in
        i686|i686.clean|i686.distclean|i686.pkgclean)
            TARGET="${TARGET_i686}"
            PREFIX="${PREFIX_i686}"
            ;;
        x86_64|x86_64.clean|x86_64.distclean|x86_64.pkgclean)
            TARGET="${TARGET_x86_64}"
            PREFIX="${PREFIX_x86_64}"
            ;;
    esac
    if [[ "${PREFIX:-}" == "" ]]; then
        echo -e "${HELP}"
        echo "target not valid: ${TARGET_PARAM}" >&2
        return 1
    fi

    # dirs
    echo "path: ${TARGET_DIR}"
    local MINGW_W64_DIR PKG_DIR SOURCE_DIR BUILD_DIR
    MINGW_W64_DIR="${TARGET_DIR}/${PREFIX}"
    PKG_DIR="${TARGET_DIR}/pkg"
    SOURCE_DIR="${TARGET_DIR}/source"
    BUILD_DIR="${TARGET_DIR}/build-${PREFIX}"
    case "${TARGET_PARAM}" in
        i686.clean|x86_64.clean)
            echo "clean:"
            echo "  rm -rf \"${BUILD_DIR}\""
            echo "  rm -rf \"${SOURCE_DIR}\""
            rm -rf "${BUILD_DIR}"
            rm -rf "${SOURCE_DIR}"
            echo "complete."
            return 0
            ;;
        i686.distclean|x86_64.distclean)
            echo "distclean:"
            echo "  rm -rf \"${MINGW_W64_DIR}\""
            rm -rf "${MINGW_W64_DIR}"
            echo "complete."
            return 0
            ;;
        i686.pkgclean|x86_64.pkgclean)
            echo "pkgclean:"
            echo "  rm -rf \"${PKG_DIR}\""
            rm -rf "${PKG_DIR}"
            echo "complete."
            return 0
            ;;
    esac
    mkdir -p "${TARGET_DIR}"
    if [[ ! -d "${TARGET_DIR}" ]]; then
        echo "unable to create directory: ${TARGET_DIR}" >&2
        return 1
    fi
    if [[ -e "${MINGW_W64_DIR}" ]]; then
        # prefix dir should not exist
        echo "directory exists: ${MINGW_W64_DIR}" >&2
        return 1
    fi
    mkdir -p "${MINGW_W64_DIR}"
    if [[ ! -d "${MINGW_W64_DIR}" ]]; then
        echo "unable to create directory: ${MINGW_W64_DIR}" >&2
        return 1
    fi
    mkdir -p "${PKG_DIR}"
    if [[ ! -d "${PKG_DIR}" ]]; then
        echo "unable to create directory: ${PKG_DIR}" >&2
        return 1
    fi
    mkdir -p "${SOURCE_DIR}"
    if [[ ! -d "${SOURCE_DIR}" ]]; then
        echo "unable to create directory: ${SOURCE_DIR}" >&2
        return 1
    fi
    if [[ -e "${BUILD_DIR}" ]]; then
        # never reuse build dir
        rm -rf "${BUILD_DIR}"
    fi
    mkdir -p "${BUILD_DIR}"
    if [[ ! -d "${BUILD_DIR}" ]]; then
        echo "unable to create directory: ${BUILD_DIR}" >&2
        return 1
    fi

    # verify/fetch
    echo "verify:"
    local DOWNLOAD_VERBOSE I URLS_IREF URLS
    DOWNLOAD_VERBOSE=true
    for I in "${!PKGS[@]}"; do
        echo "  ${PKGS[I]}"
        URLS_IREF="${URLS_VARNAMES[I]}[@]"
        URLS="${!URLS_IREF}"
        if ! tar -tf "${PKG_DIR}/${PKGS[I]}" >/dev/null 2>&1; then
            download_url "${DOWNLOAD_VERBOSE}" "${PKG_DIR}/${PKGS[I]}" ${URLS[@]} || return 1
        fi
        if ! tar -tf "${PKG_DIR}/${PKGS[I]}" >/dev/null 2>&1; then
            echo "unable to verify package: ${PKG_DIR}/${PKGS[I]}" >&2
            return 1
        fi
    done

    # extract
    echo "extract:"
    for I in "${!PKGS[@]}"; do
        echo "  ${PKGS[I]}"
        if [[ -e "${SOURCE_DIR}/${NAMES[I]}" ]]; then
            rm -rf "${SOURCE_DIR}/${NAMES[I]}"
        fi
        mkdir -p "${SOURCE_DIR}/${NAMES[I]}"
        if ! tar -xf "${PKG_DIR}/${PKGS[I]}" -C "${SOURCE_DIR}/${NAMES[I]}" >/dev/null 2>&1; then
            echo "unable to extract package: ${PKG_DIR}/${PKGS[I]}" >&2
            return 1
        fi
    done

    # host
    echo "host:"
    local SYS_NAME SYS_ARCH SYS_TYPE CPU_COUNT
    SYS_NAME=$(uname | awk '{ print tolower($0)}')
    SYS_ARCH=$(uname -m)
    SYS_TYPE=$("${SOURCE_DIR}/config/config-${CONFIG_VER}/config.guess")
    if [[ "${SYS_NAME}" == "darwin" ]]; then
        CPU_COUNT=$(sysctl -n hw.ncpu 2>/dev/null)
    elif [[ "${SYS_NAME}" == "linux" ]]; then
        CPU_COUNT=$(grep -c processor /proc/cpuinfo 2>/dev/null)
    fi
    CPU_COUNT="${CPU_COUNT:-1}"
    echo "  name: ${SYS_NAME}"
    echo "  arch: ${SYS_ARCH}"
    echo "  type: ${SYS_TYPE}"
    echo "  vcpu: ${CPU_COUNT}"

    # build
    echo "target: ${TARGET}"
    echo "build:"

    # binutils
    echo "  binutils ${BINUTILS_VER}"
    mkdir -pv "${BUILD_DIR}/binutils" > "${BUILD_DIR}/binutils.log" 2>&1 || return 1
    cd "${BUILD_DIR}/binutils"
    CC=gcc CXX=g++ "${SOURCE_DIR}/binutils/binutils-${BINUTILS_VER}/configure" --build="${SYS_TYPE}" --target="${TARGET}" --with-sysroot="${MINGW_W64_DIR}" --prefix="${MINGW_W64_DIR}" --disable-shared --enable-static --disable-multilib --disable-werror >> "${BUILD_DIR}/binutils.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" >> "${BUILD_DIR}/binutils.log" 2>&1 || return 1
    make install-strip >> "${BUILD_DIR}/binutils.log" 2>&1 || return 1

    # update PATH
    export PATH="${MINGW_W64_DIR}/bin:${PATH}"

    # mingw-w64 headers
    echo "  mingw-w64 ${MINGW_W64_VER} headers"
    mkdir -pv "${BUILD_DIR}/mingw-w64-headers" > "${BUILD_DIR}/mingw-w64-headers.log" 2>&1 || return 1
    cd "${BUILD_DIR}/mingw-w64-headers"
    "${SOURCE_DIR}/mingw-w64/mingw-w64-v${MINGW_W64_VER}/mingw-w64-headers/configure" --build="${SYS_TYPE}" --host="${TARGET}" --prefix="${MINGW_W64_DIR}" --enable-sdk=all >> "${BUILD_DIR}/mingw-w64-headers.log" 2>&1 || return 1
    make install >> "${BUILD_DIR}/mingw-w64-headers.log" 2>&1 || return 1

    # create symlinks
    cd "${MINGW_W64_DIR}"
    ln -s "${TARGET}" mingw
    if [[ ! -d "usr" ]]; then
        ln -s . usr
    fi
    if [[ ! -d "${TARGET}/include" ]]; then
        cd "${TARGET}"
        ln -s ../include include
        cd "${MINGW_W64_DIR}"
    fi
    if [[ ! -d "${TARGET}/usr" ]]; then
        cd "${TARGET}"
        ln -s . usr
        cd "${MINGW_W64_DIR}"
    fi

    # gmp
    echo "  gmp ${GMP_VER}"
    local GMP_DIR
    GMP_DIR="${BUILD_DIR}/gmp-${GMP_VER}-${SYS_ARCH}"
    mkdir -pv "${BUILD_DIR}/gmp" > "${BUILD_DIR}/gmp.log" 2>&1 || return 1
    cd "${BUILD_DIR}/gmp"
    CC=gcc CXX=g++ CPPFLAGS=-fexceptions "${SOURCE_DIR}/gmp/gmp-${GMP_VER}/configure" --build="${SYS_TYPE}" --prefix="${GMP_DIR}" --enable-fat --disable-shared --enable-static --enable-cxx >> "${BUILD_DIR}/gmp.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" >> "${BUILD_DIR}/gmp.log" 2>&1 || return 1
    make check >> "${BUILD_DIR}/gmp.log" 2>&1 || return 1
    make install >> "${BUILD_DIR}/gmp.log" 2>&1 || return 1

    # mpfr
    echo "  mpfr ${MPFR_VER}"
    local MPFR_DIR
    MPFR_DIR="${BUILD_DIR}/mpfr-${MPFR_VER}-${SYS_ARCH}"
    mkdir -pv "${BUILD_DIR}/mpfr" > "${BUILD_DIR}/mpfr.log" 2>&1 || return 1
    cd "${BUILD_DIR}/mpfr"
    CC=gcc CXX=g++ CFLAGS="-I${GMP_DIR}/include" CPPFLAGS="-I${GMP_DIR}/include" LDFLAGS="-L${GMP_DIR}/lib" "${SOURCE_DIR}/mpfr/mpfr-${MPFR_VER}/configure" --build="${SYS_TYPE}" --prefix="${MPFR_DIR}" --disable-shared --enable-static --with-gmp="${GMP_DIR}" >> "${BUILD_DIR}/mpfr.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" >> "${BUILD_DIR}/mpfr.log" 2>&1 || return 1
    make install >> "${BUILD_DIR}/mpfr.log" 2>&1 || return 1

    # mpc
    echo "  mpc ${MPC_VER}"
    local MPC_DIR
    MPC_DIR="${BUILD_DIR}/mpc-${MPC_VER}-${SYS_ARCH}"
    mkdir -pv "${BUILD_DIR}/mpc" > "${BUILD_DIR}/mpc.log" 2>&1 || return 1
    cd "${BUILD_DIR}/mpc"
    CC=gcc CXX=g++ CFLAGS="-I${GMP_DIR}/include -I${MPFR_DIR}/include" CPPFLAGS="-I${GMP_DIR}/include -I${MPFR_DIR}/include" LDFLAGS="-L${GMP_DIR}/lib -L${MPFR_DIR}/lib" "${SOURCE_DIR}/mpc/mpc-${MPC_VER}/configure" --build="${SYS_TYPE}" --prefix="${MPC_DIR}" --with-gmp="${GMP_DIR}" --with-mpfr="${MPFR_DIR}" --disable-shared --enable-static >> "${BUILD_DIR}/mpc.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" >> "${BUILD_DIR}/mpc.log" 2>&1 || return 1
    make install >> "${BUILD_DIR}/mpc.log" 2>&1 || return 1

    # isl
    echo "  isl ${ISL_VER}"
    local ISL_DIR
    ISL_DIR="${BUILD_DIR}/isl-${ISL_VER}-${SYS_ARCH}"
    mkdir -pv "${BUILD_DIR}/isl" > "${BUILD_DIR}/isl.log" 2>&1 || return 1
    cd "${BUILD_DIR}/isl"
    CC=gcc CXX=g++ CFLAGS="-I${GMP_DIR}/include" CPPFLAGS="-I${GMP_DIR}/include" LDFLAGS="-L${GMP_DIR}/lib" "${SOURCE_DIR}/isl/isl-${ISL_VER}/configure" --build="${SYS_TYPE}" --prefix="${ISL_DIR}" --with-gmp="${GMP_DIR}" --disable-shared --enable-static --with-piplib=no --with-clang=no >> "${BUILD_DIR}/isl.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" >> "${BUILD_DIR}/isl.log" 2>&1 || return 1
    make install >> "${BUILD_DIR}/isl.log" 2>&1 || return 1

    # gcc core
    echo "  gcc ${GCC_VER} core"
    local GCC_CONFIG_EXTRA
    GCC_CONFIG_EXTRA=""
    if [[ "${SYS_NAME}" == "darwin" ]]; then
        GCC_CONFIG_EXTRA="--with-system-zlib"
    fi
    mkdir -pv "${BUILD_DIR}/gcc" > "${BUILD_DIR}/gcc.log" 2>&1 || return 1
    cd "${BUILD_DIR}/gcc"
    CFLAGS="-I${GMP_DIR}/include -I${MPFR_DIR}/include -I${MPC_DIR}/include -I${ISL_DIR}/include" CPPFLAGS="-I${GMP_DIR}/include -I${MPFR_DIR}/include -I${MPC_DIR}/include -I${ISL_DIR}/include" LDFLAGS="-L${GMP_DIR}/lib -L${MPFR_DIR}/lib -L${MPC_DIR}/lib -L${ISL_DIR}/lib" "${SOURCE_DIR}/gcc/gcc-${GCC_VER}/configure" --build="${SYS_TYPE}" --host="${SYS_TYPE}" --target="${TARGET}" --prefix="${MINGW_W64_DIR}" --with-sysroot="${MINGW_W64_DIR}" --with-gmp="${GMP_DIR}" --with-mpfr="${MPFR_DIR}" --with-mpc="${MPC_DIR}" --with-isl="${ISL_DIR}" --disable-shared --enable-static --disable-multilib --disable-nls --disable-libstdcxx-pch --disable-win32-registry --enable-checking=release --enable-languages=c,c++ --enable-fully-dynamic-string --enable-version-specific-runtime-libs --enable-lto "${GCC_CONFIG_EXTRA}" >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" all-gcc >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1
    make install-gcc >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1

    # mingw-w64 runtime
    echo "  mingw-w64 ${MINGW_W64_VER} runtime"
    local MINGW_W64_CONFIG_EXTRA
    MINGW_W64_CONFIG_EXTRA=""
    if [[ "${TARGET}" == "${TARGET_i686}" ]]; then
        MINGW_W64_CONFIG_EXTRA="--disable-lib64"
    elif [[ "${TARGET}" == "${TARGET_x86_64}" ]]; then
        MINGW_W64_CONFIG_EXTRA="--disable-lib32"
    fi
    mkdir -pv "${BUILD_DIR}/mingw-w64-crt" > "${BUILD_DIR}/mingw-w64-crt.log" 2>&1 || return 1
    cd "${BUILD_DIR}/mingw-w64-crt"
    "${SOURCE_DIR}/mingw-w64/mingw-w64-v${MINGW_W64_VER}/mingw-w64-crt/configure" --build="${SYS_TYPE}" --host="${TARGET}" --prefix="${MINGW_W64_DIR}" --with-sysroot="${MINGW_W64_DIR}" "${MINGW_W64_CONFIG_EXTRA}" >> "${BUILD_DIR}/mingw-w64-crt.log" 2>&1 || return 1
    if [[ "${SYS_NAME}" == "darwin" ]]; then
        # parallel build fails on darwin
        make -j 1 >> "${BUILD_DIR}/mingw-w64-crt.log" 2>&1 || return 1
    else
        make -j "${CPU_COUNT}" >> "${BUILD_DIR}/mingw-w64-crt.log" 2>&1 || return 1
    fi
    make install-strip >> "${BUILD_DIR}/mingw-w64-crt.log" 2>&1 || return 1

    # relocate and symlink libs
    cd "${MINGW_W64_DIR}"
    mv "${TARGET}/lib/"* lib/
    rm -rf "${TARGET}/lib"
    cd "${TARGET}"
    ln -s ../lib lib

    # gcc
    echo "  gcc ${GCC_VER}"
    cd "${BUILD_DIR}/gcc"
    make -j "${CPU_COUNT}" all-target-libgcc >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" install-target-libgcc >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1
    make -j "${CPU_COUNT}" >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1
    make install-strip >> "${BUILD_DIR}/gcc.log" 2>&1 || return 1

    # clean up
    cd "${MINGW_W64_DIR}"
    find . -name "*.la" -type f -exec rm {} ";" >/dev/null 2>&1

    # done
    echo "bin: ${MINGW_W64_DIR}/bin"
    echo "  add to your shell startup script (usually .bashrc or .bash_profile):"
    echo "    export PATH=\"${MINGW_W64_DIR}/bin:\${PATH}\""
    echo "complete."
    return 0

    set +o pipefail
}

mingw-w64-build "${@}"