bootstrap/java/build_icedtea8.sh

#!/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_icedtea8=3.30.0

dir_download="$PWD/download"
mkdir -p build; cd build
dir_install="$PWD/install-icedtea8"

# Prepare source
tar xf "$dir_download/icedtea-$version_icedtea8.tar.xz"
cd "icedtea-$version_icedtea8"
for part in openjdk-git; do
    cp "$dir_download/icedtea-$version_icedtea8-$part.tar.xz" "$part.tar.xz"
done

unset _JAVA_OPTIONS
export PATH="$PWD/../install-icedtea7/bin:$PATH"

# Configure source
CONFIG_SHELL=/bin/bash ./configure \
    --prefix="$dir_install" \
    --with-jdk-home="$PWD/../install-icedtea7" \
    --with-parallel-jobs="$(makeopts_jobs)" \
    --enable-headless \
    --disable-docs \
    --disable-bootstrap \
    --disable-ccache \
    --disable-downloading \
    --disable-system-kerberos \
    --disable-system-pcsc \
    --disable-system-sctp

# Build and install
unset MAKEFLAGS
make
make install