#!/bin/sh
set -eu

# From: https://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/eclass/multiprocessing.eclass
makeopts_jobs() {
    # This assumes the first .* will be more greedy than the second .*
    # since POSIX doesn't specify a non-greedy match (i.e. ".*?").
    local jobs=$(echo " $MAKEFLAGS " | sed -r -n \
        -e 's:.*[[:space:]](-j|--jobs[=[:space:]])[[:space:]]*([0-9]+).*:\2:p' \
        -e 's:.*[[:space:]](-j|--jobs)[[:space:]].*:999:p')
    echo ${jobs:-1}
}

version_jdk21=21.0.3+6
version_jdk20=20.0.2+9
version_jdk19=19.0.2+7
version_jdk18=18.0.2.1+1
version_jdk17=17.0.11+6
version_jdk16=16.0.2+7
version_jdk15=15.0.10+5
version_jdk14=14.0.2+12
version_jdk13=13.0.14+5
version_jdk12=12.0.2+10
version_jdk11=11.0.23+6
version_jdk10=10.0.2+13
version_jdk9=9+181

version_jdk_bootstrap="$1"
version_jdk_major="$2"
eval version_jdk=\"\$version_$version_jdk_major\"

dir_download="$PWD/download"
dir_files="$PWD/files"
mkdir -p build; cd build
dir_install="$PWD/install-$version_jdk_major"

archive="${version_jdk_major}u-jdk-$version_jdk.tar.gz"
srcdir="${version_jdk_major}u-jdk-$(echo $version_jdk | tr + -)"

# Prepare source
tar xf "$dir_download/$archive"
cd "$srcdir"
chmod +x configure

# Some jdk versions require fixing up things
CFLAGS=""
CXXFLAGS=""
case "$version_jdk_major" in
jdk9)
    patch -p1 -i "$dir_files/jdk-9+181-disarm-timebomb.patch"
    patch -p1 -i "$dir_files/jdk-9+181-fix-pointer-comparison.patch"
    sed -i -e '/^ *COMPILER_VERSION_NUMBER=/{N;s/\[1-9\]/&[0-9]*/}' \
        common/autoconf/generated-configure.sh
    export MAKE="$PWD/../install-make42/make"
    CFLAGS="$CFLAGS -fcommon"
    CXXFLAGS="$CFLAGS -fcommon"
    ;;
jdk10)
    patch -p1 -i "$dir_files/jdk-10.0.2+13-disarm-timebomb.patch"
    patch -p1 -i "$dir_files/jdk-10.0.2+13-fix-pointer-comparison.patch"
    sed -i -e '/^ *COMPILER_VERSION_NUMBER=/{N;s/\[1-9\]/&[0-9]*/}' \
        make/autoconf/generated-configure.sh
    export MAKE="$PWD/../install-make42/make"
    CFLAGS="$CFLAGS -fcommon"
    CXXFLAGS="$CFLAGS -fcommon"
    ;;
jdk12)
    sed -i -e '/^ *COMPILER_VERSION_NUMBER=/{N;s/@<:@1-9@:>@/&@<:@0-9@:>@*/}' \
        make/autoconf/toolchain.m4
    export MAKE="$PWD/../install-make42/make"
    CFLAGS="$CFLAGS -fcommon"
    CXXFLAGS="$CFLAGS -fcommon"
    ;;
jdk13)
    sed -i -e '/^ *COMPILER_VERSION_NUMBER=/{N;s/@<:@1-9@:>@/&@<:@0-9@:>@*/}' \
        make/autoconf/toolchain.m4
    CFLAGS="$CFLAGS -fcommon"
    CXXFLAGS="$CFLAGS -fcommon"
    ;;
jdk14)
    ## Don't detect WSL
    #sed -i -e 's/grep -i microsoft/false/' \
        #make/autoconf/build-aux/config.guess
    CFLAGS="$CFLAGS -fcommon"
    CXXFLAGS="$CFLAGS -fcommon"
    ;;
jdk16)
    sed -i -e 's/\<prefix\>/fixpath_prefix/g' \
        make/autoconf/util_paths.m4
    ;;
esac

unset _JAVA_OPTIONS JAVAC

# Configure source
CONFIG_SHELL=/bin/bash ./configure \
    --build="$(uname -m)-pc-linux-gnu" \
    --prefix="$dir_install" \
    --with-boot-jdk="$PWD/../install-$version_jdk_bootstrap" \
    --with-jobs="$(makeopts_jobs)" \
    --with-extra-cflags="$CFLAGS -w" \
    --with-extra-cxxflags="$CXXFLAGS -w" \
    --enable-headless-only \
    --disable-full-docs \
    --disable-warnings-as-errors
echo "$version_jdk" > .src-rev

# Build and install
unset MAKEFLAGS
make install