#!/bin/sh

msg() {
    echo "configure: $1"
}

step_msg() {
    msg
    msg "$1"
    msg
}

warn() {
    echo "configure: WARNING: $1"
}

err() {
    echo "configure: error: $1"
    exit 1
}

need_ok() {
    if [ $? -ne 0 ]
    then
        err $1
    fi
}

need_cmd() {
    if which $1 >/dev/null 2>&1
    then msg "found $1"
    else err "need $1"
    fi
}

make_dir() {
    if [ ! -d $1 ]
    then
        msg "mkdir -p $1"
        mkdir -p $1
    fi
}

copy_if_changed() {
    if cmp -s $1 $2
    then
        msg "leaving $2 unchanged"
    else
        msg "cp $1 $2"
        cp -f $1 $2
        chmod u-w $2 # make copied artifact read-only
    fi
}

move_if_changed() {
    if cmp -s $1 $2
    then
        msg "leaving $2 unchanged"
    else
        msg "mv $1 $2"
        mv -f $1 $2
        chmod u-w $2 # make moved artifact read-only
    fi
}

putvar() {
    local T
    eval T=\$$1
    eval TLEN=\${#$1}
    if [ $TLEN -gt 35 ]
    then
        printf "configure: %-20s := %.35s ...\n" $1 "$T"
    else
        printf "configure: %-20s := %s %s\n" $1 "$T" "$2"
    fi
    printf "%-20s ?= %s\n" $1 "$T" >>${CFG_BUILD_HOME}config.tmp
}

probe() {
    local V=$1
    shift
    local P
    local T
    for P
    do
        T=$(which $P 2>&1)
        if [ $? -eq 0 ]
        then
            VER0=$($P --version 2>/dev/null | head -1 \
                |  sed -e 's/[^0-9]*\([vV]\?[0-9.]\+[^ ]*\).*/\1/' )
            if [ $? -eq 0 -a "x${VER0}" != "x" ]
            then
              VER="($VER0)"
            else
              VER=""
            fi
            break
        else
            VER=""
            T=""
        fi
    done
    eval $V=\$T
    putvar $V "$VER"
}

probe_need() {
    local V=$1
    probe $*
    eval VV=\$$V
    if [ -z "$VV" ]
    then
        err "needed, but unable to find any of: $*"
    fi
}

valopt() {
    local OP=$1
    local DEFAULT=$2
    shift
    shift
    local DOC="$*"
    if [ $HELP -eq 0 ]
    then
        local UOP=$(echo $OP | tr '[:lower:]' '[:upper:]' | tr '\-' '\_')
        local V="CFG_${UOP}"
        eval $V="$DEFAULT"
        for arg in $CFG_CONFIGURE_ARGS
        do
            if echo "$arg" | grep -q -- "--$OP="
            then
                val=$(echo "$arg" | cut -f2 -d=)
                eval $V=$val
            fi
        done
        putvar $V
    else
        if [ -z "$DEFAULT" ]
        then
            DEFAULT="<none>"
        fi
        OP="${OP}=[${DEFAULT}]"
        printf "    --%-30s %s\n" "$OP" "$DOC"
    fi
}

opt() {
    local OP=$1
    local DEFAULT=$2
    shift
    shift
    local DOC="$*"
    local FLAG=""

    if [ $DEFAULT -eq 0 ]
    then
        FLAG="enable"
    else
        FLAG="disable"
        DOC="don't $DOC"
    fi

    if [ $HELP -eq 0 ]
    then
        for arg in $CFG_CONFIGURE_ARGS
        do
            if [ "$arg" = "--${FLAG}-${OP}" ]
            then
                OP=$(echo $OP | tr 'a-z-' 'A-Z_')
                FLAG=$(echo $FLAG | tr 'a-z' 'A-Z')
                local V="CFG_${FLAG}_${OP}"
                eval $V=1
                putvar $V
            fi
        done
    else
        if [ ! -z "$META" ]
        then
            OP="$OP=<$META>"
        fi
        printf "    --%-30s %s\n" "$FLAG-$OP" "$DOC"
     fi
}

split_triple() {
    local TRIPLE=$1
    local ARCH=$2
    local VENDOR=$3
    local OS=$4

    eval $ARCH=$(echo "$TRIPLE" | cut -d'-' -f1)
    eval $VENDOR=$(echo "$TRIPLE" | cut -d'-' -f2)
    eval $OS=$(echo "$TRIPLE" | cut -d'-' -f3)

    if [ $(echo "$TRIPLE" | cut -d'-' -f3) = "androideabi" ]
    then
        eval $OS="android"
    fi
}

os_type() {
    # The goal here is to come up with the same triple as LLVM would,
    # at least for the subset of platforms we're willing to target.

    local OP=$1
    local OSTYPE=$(echo "$2" | tr '[:upper:]' '[:lower:]')
    local V="${OP}"

    case $OSTYPE in

        linux)
            eval $V=unknown-linux-gnu
            ;;

        freebsd)
            eval $V=unknown-freebsd
            ;;

        darwin)
            eval $V=apple-darwin
            ;;

        mingw32*)
            eval $V=pc-mingw32
            ;;

        android)
            eval $V=linux-androideabi
            ;;

        *)
            err "unknown OS type: $OSTYPE"
            ;;
    esac
}

cpu_type() {
    local OP=$1
    local CPUTYPE=$2
    local V="${OP}"

    case $CPUTYPE in

        i386 | i486 | i686 | i786 | x86)
            eval $V=i686
            ;;

        xscale | arm)
            eval $V=arm
            ;;

        x86_64 | x86-64 | x64 | amd64)
            eval $V=x86_64
            ;;

        *)
            err "unknown CPU type: $CPUTYPE"
    esac
}

if [ -f configure -a -f Makefile.in ]; then
    msg "You seem to be running configure within the source tree root."
    msg "This is not supported.  Instead, make a build directory:"
    msg ""
    msg "    mkdir -p build && cd build && ../configure"
    msg ""
    msg "See README.md for more information."
    exit 1
fi

msg "looking for configure programs"
need_cmd cmp
need_cmd mkdir
need_cmd printf
need_cmd cut
need_cmd grep
need_cmd xargs
need_cmd cp
need_cmd find
need_cmd uname
need_cmd date
need_cmd tr
need_cmd sed

msg "inspecting environment"

OSTYPE=$(uname -s)
CPUTYPE=$(uname -m)

if [ $OSTYPE = Darwin -a $CPUTYPE = i386 ]
then
    # Darwin's `uname -m` lies and always returns i386. We have to use sysctl
    # instead.
    if sysctl hw.optional.x86_64 | grep -q ': 1'
    then
        CPUTYPE=x86_64
    fi
fi

os_type CFG_BUILD_OSTYPE ${OSTYPE}
cpu_type CFG_BUILD_CPUTYPE ${CPUTYPE}

DEFAULT_TARGET="${CFG_BUILD_CPUTYPE}-${CFG_BUILD_OSTYPE}"

CFG_SRC_DIR="$(cd $(dirname $0) && pwd)/"
CFG_BUILD_HOME="$(pwd)/"
CFG_SELF=${CFG_SRC_DIR}$(basename $0)
CFG_CONFIGURE_ARGS="$@"
CFG_PATH=$PATH

if [ -n "$CFG_DISABLE_MANAGE_SUBMODULES" ]
then
    if git status $CFG_SRC_DIR/src/compiler $CFG_SRC_DIR/src/support $CFG_SRC_DIR/src/platform \
        | grep -q 'modified:.*modified content'; then
        err "Some submodule has a dirty working tree.  See 'git status'."
    fi
fi

OPTIONS=""
HELP=0
if [ "$1" = "--help" ]
then
    HELP=1
    shift
    echo ""
    echo "Usage: $CFG_SELF [options]"
    echo ""
    echo "Options:"
    echo ""
else
    msg "recreating config.tmp"
    echo '' >${CFG_BUILD_HOME}config.tmp

    step_msg "processing $CFG_SELF args"
fi

opt optimize 1 "build optimized rust code"
opt optimize-cxx 1 "build optimized C++ code"
opt manage-submodules 1 "let the build manage the git submodules"
opt fast-make 0 "use .gitmodules as timestamp for submodule deps"
opt debug 0 "build with debugging code and symbols"
opt debug-skia 0 "build Skia and Azure for debugging (significant performance hit)"
valopt local-rust-root "" "set prefix for local rust binary"
valopt target "${DEFAULT_TARGET}" "target to be compiled"
valopt android-cross-path "/opt/ndk_standalone" "Android NDK cross compiler path"
valopt android-ndk-path "/opt/android-ndk" "Android NDK path"
valopt android-sdk-path "/opt/android-sdk" "Android SDK path"
valopt android-font-path "/system/fonts" "Android Font path"
valopt android-resource-path "/sdcard/servo" "Android Resource path"

if [ $HELP -eq 1 ]
then
    echo ""
    exit 0
fi

# Split target triple
split_triple "${CFG_TARGET}" TARGET_CPUTYPE TARGET_VENDOR TARGET_OSTYPE

# Set target os and cpu type
os_type CFG_OSTYPE ${TARGET_OSTYPE}
cpu_type CFG_CPUTYPE ${TARGET_CPUTYPE}

# probe before updating PATH so we don't get ndk-toolchain stuff
probe_need CFG_GIT         git
probe_need CFG_PYTHON2     python2 python2.7 python
export PYTHON=${CFG_PYTHON2}
echo "exporting python = ${CFG_PYTHON2}"
# Spidermonkey requires autoconf 2.13 exactly
probe_need CFG_AUTOCONF213 autoconf213  \
                           autoconf2.13 \
                           autoconf-2.13

step_msg "looking for build programs"
case ${TARGET_OSTYPE} in
    android)
        CFG_PATH=$PATH:"${CFG_ANDROID_CROSS_PATH}/bin"
        OLD_PATH=$PATH
        export PATH=${CFG_PATH}

        probe CFG_CC               arm-linux-androideabi-gcc
        probe CFG_CXX              arm-linux-androideabi-g++
        probe CFG_LD               arm-linux-androideabi-ld
        probe CFG_AR               arm-linux-androideabi-ar
        probe CFG_RANLIB	       arm-linux-androideabi-ranlib

        export PATH=${OLD_PATH}
        ;;
    *)
        CFG_PATH=$PATH
        probe CFG_CC               gcc
        probe CFG_CXX              g++
        probe CFG_LD               ld
        probe CFG_AR               ar
        probe CFG_RANLIB	   ranlib
        CFG_RUSTC_FLAGS=""
        ;;
esac

probe CFG_CLANG            clang++

CFG_BUILD_DIR="${CFG_BUILD_HOME}${CFG_TARGET}/"
make_dir "${CFG_BUILD_DIR}"

if [ ! -z "$CFG_LOCAL_RUST_ROOT" ]
then
    if [ -f ${CFG_LOCAL_RUST_ROOT}/bin/rustc ]
    then
        LRV=`${CFG_LOCAL_RUST_ROOT}/bin/rustc --version`
        step_msg "using rustc at: ${CFG_LOCAL_RUST_ROOT} with version: $LRV"
        CFG_RUSTC=${CFG_LOCAL_RUST_ROOT}/bin/rustc
        CFG_RUST_HOME=${CFG_LOCAL_RUST_ROOT}
        CFG_LOCAL_RUSTC=1
    else
        err "No rustc found at ${CFG_LOCAL_RUST_ROOT}/bin/rustc"
    fi
else
    step_msg "using in-tree rust compiler"
    # The Rust compiler we're going to build
    CFG_RUSTC="${CFG_BUILD_DIR}src/compiler/rust/${DEFAULT_TARGET}/stage2/bin/rustc"
    CFG_RUST_HOME="${CFG_BUILD_DIR}src/compiler/rust/${DEFAULT_TARGET}/stage2"
fi

if [ -z "$CFG_ENABLE_CLANG" -a -z "$CFG_CC" ]
then
    err "either clang or gcc is required"
fi

# Configure submodules
step_msg "configuring submodules"

# Have to be in the top of src directory for this
if [ -z $CFG_DISABLE_MANAGE_SUBMODULES ]
then
    cd ${CFG_SRC_DIR}

    msg "git: submodule sync"
    "${CFG_GIT}" submodule --quiet sync

    # NB: this is just for the sake of getting the submodule SHA1 values
    # and status written into the build log.
    msg "git: submodule status"
    "${CFG_GIT}" submodule status --recursive

    msg "git: submodule update"
    "${CFG_GIT}" submodule update --init
    need_ok "git failed"

    msg "git: submodule foreach sync"
    "${CFG_GIT}" submodule foreach --recursive 'if test -e .gitmodules; then git submodule sync; fi'
    need_ok "git failed"

    msg "git: submodule foreach update"
    "${CFG_GIT}" submodule update --init --recursive
    need_ok "git failed"

    msg "git: submodule clobber"
    "${CFG_GIT}" submodule foreach --recursive \
      'if [ -n "$(git status --porcelain)" ] ; then echo "Refusing to clobber $path" ; else git clean -dxf ; git checkout . ; fi'
    need_ok "git failed"

    cd ${CFG_BUILD_DIR}
fi

step_msg "running submodule autoconf scripts"

msg "configuring src/mozjs"

AUTOCONF213_M4_MACROS="$(dirname ${CFG_AUTOCONF213})/../share/$(basename ${CFG_AUTOCONF213})/"

# Run the SpiderMonkey autoconf using autoconf 2.13
(cd ${CFG_SRC_DIR}src/support/spidermonkey/mozjs/js/src && "${CFG_AUTOCONF213}" -l "${AUTOCONF213_M4_MACROS}") || exit $?

if [ $CFG_OSTYPE = "linux-androideabi" ]
then
    msg "configuring src/libexpat"
    (cd ${CFG_SRC_DIR}src/platform/android/libexpat/expat && sh "buildconf.sh") || exit $?
    ## expat is missing install-sh and other tools and doesn't use automake
    ## which is what creates it. use the ones from spidermonkey
    for name in install-sh config.sub config.guess
    do
        cp ${CFG_SRC_DIR}src/support/spidermonkey/mozjs/js/src/build/autoconf/${name} ${CFG_SRC_DIR}src/platform/android/libexpat/expat/conftools/
    done
fi

CFG_SUBMODULES="\
    support/alert/rust-alert \
    support/azure/rust-azure \
    support/css/rust-cssparser \
    support/encoding/rust-encoding \
    support/harfbuzz/rust-harfbuzz \
    support/http/rust-http \
    support/hubbub/libhubbub \
    support/hubbub/rust-hubbub \
    support/libparserutils/libparserutils \
    support/skia/skia \
    support/spidermonkey/mozjs \
    support/spidermonkey/rust-mozjs \
    support/stb-image/rust-stb-image \
    support/png/libpng \
    support/png/rust-png \
    support/geom/rust-geom \
    support/layers/rust-layers \
    support/opengles/rust-opengles \
    support/sharegl/sharegl"

if [ $CFG_OSTYPE = "apple-darwin" ]
then
CFG_SUBMODULES="\
    platform/macos/rust-core-foundation \
    platform/macos/rust-core-graphics \
    platform/macos/rust-core-text \
    platform/macos/rust-io-surface \
    support/glfw/glfw \
    support/glfw/glfw-rs \
    platform/macos/rust-cocoa \
    ${CFG_SUBMODULES}"
fi

if [ $CFG_OSTYPE = "unknown-linux-gnu" ]
then
CFG_SUBMODULES="\
    platform/linux/rust-xlib \
    platform/linux/fontconfig \
    support/glfw/glfw \
    support/glfw/glfw-rs \
    platform/linux/rust-fontconfig \
    platform/linux/rust-freetype \
    ${CFG_SUBMODULES}"
fi

if [ $CFG_OSTYPE = "linux-androideabi" ]
then
CFG_SUBMODULES="\
    support/glut/rust-glut \
    support/egl/rust-egl \
    platform/android/libexpat \
    platform/android/libfreetype2 \
    platform/android/fontconfig \
    platform/linux/rust-fontconfig \
    platform/linux/rust-freetype \
    ${CFG_SUBMODULES}"
fi

step_msg "writing configuration"

putvar CFG_TARGET
putvar CFG_CPUTYPE
putvar CFG_OSTYPE
putvar CFG_SRC_DIR
putvar CFG_BUILD_HOME
putvar CFG_BUILD_DIR
putvar CFG_CONFIGURE_ARGS
putvar CFG_SUBMODULES
putvar CFG_DISABLE_MANAGE_SUBMODULES
putvar CFG_RUSTC
putvar CFG_RUSTC_FLAGS
putvar CFG_RUST_HOME
putvar CFG_PATH
putvar CFG_LOCAL_RUSTC
putvar CFG_LOCAL_RUST_ROOT
putvar CFG_ENABLE_DEBUG
putvar CFG_ENABLE_DEBUG_SKIA

msg
copy_if_changed ${CFG_SRC_DIR}Makefile.in ${CFG_BUILD_HOME}Makefile
move_if_changed ${CFG_BUILD_HOME}config.tmp ${CFG_BUILD_HOME}config.mk
copy_if_changed ${CFG_BUILD_HOME}config.mk ${CFG_SRC_DIR}/.config.mk.last
rm -f ${CFG_BUILD_HOME}config.tmp
touch ${CFG_BUILD_HOME}config.stamp

export CFG_CONFIG_MK="${CFG_BUILD_HOME}config.mk"

step_msg "making build directories"

cd "${CFG_BUILD_DIR}"

for i in ${CFG_SUBMODULES}
do
    make_dir ${CFG_BUILD_DIR}src/${i}
done

make_dir ${CFG_BUILD_DIR}src/components/macros
make_dir ${CFG_BUILD_DIR}src/components/util
make_dir ${CFG_BUILD_DIR}src/components/embedding
make_dir ${CFG_BUILD_DIR}src/components/msg
make_dir ${CFG_BUILD_DIR}src/components/net
make_dir ${CFG_BUILD_DIR}src/components/gfx
make_dir ${CFG_BUILD_DIR}src/components/script
make_dir ${CFG_BUILD_DIR}src/components/style
make_dir ${CFG_BUILD_DIR}src/components/main
make_dir src/test/html/ref
make_dir src/compiler/rust

# TODO: don't run configure on submodules unless necessary. For an example,
# see how Rust's configure script optionally reconfigures the LLVM module.
step_msg "running submodule configure scripts"

# Only reconfigure Rust when it changes
do_reconfigure=1
index1="${CFG_SRC_DIR}.git/modules/src/compiler/rust/index"
index2="${CFG_SRC_DIR}src/compiler/rust/.git/index"
for index in ${index1} ${index2}
do
    config_stamp="${CFG_BUILD_DIR}src/compiler/rust/config.stamp"
    if test -e ${index} -a -e ${config_stamp} -a ${config_stamp} -nt ${index}
    then
        msg "not reconfiguring Rust, config.stamp is fresh"
        do_reconfigure=0
    fi
done

if [ ${do_reconfigure} -ne 0 ]
then
    cd ${CFG_BUILD_DIR}src/compiler/rust
    RUST_CONFIGURE_ARGS="--enable-debug"
    if [ $CFG_OSTYPE = "linux-androideabi" ]; then
        RUST_CONFIGURE_ARGS="--target=arm-linux-androideabi --android-cross-path=${CFG_ANDROID_CROSS_PATH}"
    fi
    ${CFG_SRC_DIR}src/compiler/rust/configure ${RUST_CONFIGURE_ARGS}
    cd ${CFG_BUILD_DIR}
fi

# fontconfig expects to use an installed freetype, but we want to use our version on Android
if [ $CFG_OSTYPE = "linux-androideabi" ]
then
    export FREETYPE_CFLAGS="-I${CFG_SRC_DIR}src/platform/android/libfreetype2/include -I${CFG_BUILD_DIR}src/platform/android/libfreetype2/include"
    export FREETYPE_LIBS="-L${CFG_BUILD_DIR}src/platform/android/libfreetype2/.libs -lfreetype"
fi

# PIC all the things
export CFLAGS="${CFLAGS} -fPIC"
export LDFLAGS="${CFLAGS} -fPIC"

if [ $CFG_BUILD_OSTYPE = "apple-darwin" ]
then
  export LIBTOOLIZE=glibtoolize
fi

# cross compile configurations
EXTRA_CONFIGURE_ARGS="CC=${CFG_CC} CXX=${CFG_CXX} LD=${CFG_LD} AR=${CFG_AR} RANLIB=${CFG_RANLIB}"

for i in ${CFG_SUBMODULES}
do
    if [ -d ${CFG_BUILD_DIR}src/${i} ]
    then
	cd ${CFG_BUILD_DIR}src/${i}
    fi
    CONFIGURE_SCRIPT="${CFG_SRC_DIR}src/${i}/configure"
    CONFIGURE_ARGS=""
    ENV_VARS=""
    ENABLE_DEBUG="$CFG_ENABLE_DEBUG"

    case $i in
        platform/android/libexpat)
            CONFIGURE_SCRIPT="${CFG_SRC_DIR}src/${i}/expat/configure"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --host=arm-linux-androideabi"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-sysroot=${CFG_ANDROID_CROSS_PATH}/sysroot"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} ${EXTRA_CONFIGURE_ARGS}"
            ;;
        platform/android/libfreetype2)
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --host=arm-linux"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-sysroot=${CFG_ANDROID_CROSS_PATH}/sysroot"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --without-zlib"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} ${EXTRA_CONFIGURE_ARGS}"
            ;;
        platform/linux/fontconfig)
            CONFIGURE_SCRIPT="${CFG_SRC_DIR}src/${i}/autogen.sh"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --sysconfdir=/etc"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --localstatedir=/var"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --disable-docs"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --disable-shared" # work around Rust #12557
            if [ -f /etc/redhat-release ]; then
                # Some RedHat-based distros (including our CentOS 6 build machines) are missing
                # pkg-config files for expat: https://bugzilla.redhat.com/show_bug.cgi?id=833338
                CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-expat=/usr"
            fi
            CONFIGURE_ARGS="${CONFIGURE_ARGS} ${EXTRA_CONFIGURE_ARGS}"
            ;;
        platform/android/fontconfig)
            CONFIGURE_SCRIPT="${CFG_SRC_DIR}src/${i}/autogen.sh"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --host=arm-linux-androideabi"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-arch=arm"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-expat-includes=${CFG_SRC_DIR}src/platform/android/libexpat/expat/lib"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-expat-lib=${CFG_BUILD_DIR}src/platform/android/libexpat/.libs"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-sysroot=${CFG_ANDROID_CROSS_PATH}/sysroot"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-cache-dir=${CFG_ANDROID_RESOURCE_PATH}/.fccache"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-confdir=${CFG_ANDROID_RESOURCE_PATH}/.fcconfig"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-default-fonts=${CFG_ANDROID_FONT_PATH}"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} ${EXTRA_CONFIGURE_ARGS}"
            ;;
        support/spidermonkey/mozjs)
            # needed because Spidermonkey configure is in non-standard location
                CONFIGURE_SCRIPT="${CFG_SRC_DIR}src/${i}/js/src/configure"
            if [ ${CFG_OSTYPE} = "linux-androideabi" ]; then
                CONFIGURE_ARGS="${CONFIGURE_ARGS} --target=arm-linux-androideabi"
                CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-android-ndk=${CFG_ANDROID_NDK_PATH}"
                CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-android-toolchain=${CFG_ANDROID_CROSS_PATH}"
            fi
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --enable-gczeal"
            ;;
        support/skia/skia)
            # Right now the skia configure script actually ignores --enable-debug and the
            # build looks only at CFG_ENABLE_DEBUG_SKIA exported from our Makefile.  But we
            # still refrain from passing --enable-debug if we didn't get --enable-debug-skia,
            # in order to be more future-proof.
            #
            # The same applies to rust-azure below.  Also note that the two libraries won't
            # link if one is built with debugging and the other isn't.
            ENABLE_DEBUG="$CFG_ENABLE_DEBUG_SKIA"
            ;;
        support/azure/rust-azure)
            # needed because Azure's configure wants "--enable-skia"
            CONFIGURE_ARGS="${CONFIGURE_ARGS} --enable-skia"
            ENABLE_DEBUG="$CFG_ENABLE_DEBUG_SKIA"
            ;;
        *)
            ;;
    esac

    if [ -n "$ENABLE_DEBUG" ]; then
        CONFIGURE_ARGS="${CONFIGURE_ARGS} --enable-debug"
    fi

    if [ -f ${CONFIGURE_SCRIPT} ]; then
	(sh ${CONFIGURE_SCRIPT} ${CONFIGURE_ARGS}) || exit $?
    fi
done

step_msg "complete"