#!/bin/sh
set -eu

version_gcc=6.5.0
version_ecj=4.9

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

# Prepare source
tar xf "$dir_download/gcc-$version_gcc.tar.xz"
cd "gcc-$version_gcc"

cp "$dir_download/ecj-$version_ecj.jar" ecj.jar
cp "$dir_download/javac.in" .
sed -i -e 's/\.\/fixinc\.sh/-c true/' gcc/Makefile.in

mkdir -p build; cd build

# Configure source
CFLAGS='-O2 -w' CXXFLAGS='-O2 -w' ../configure \
    --prefix="$dir_install" \
    --disable-multilib \
    --disable-bootstrap \
    --disable-nls \
    --enable-languages=java \
    --enable-java-home \
    --with-java-home="$dir_install/lib/jvm/jre"

# Build and install
make all-gcc all-target-libgcc all-target-libstdc++-v3 all-target-libjava
make install-gcc install-target-libgcc install-target-libstdc++-v3 install-target-libjava

cd ..
sed -e "s#@JAVA@#$dir_install/lib/jvm/bin/java#" \
    -e "s#@ECJ_JAR@#$dir_install/share/java/ecj.jar#" \
    -e "s#@RT_JAR@#$dir_install/lib/jvm/jre/lib/rt.jar#" \
    -e "s#@TOOLS_JAR@#$dir_install/lib/jvm/lib/tools.jar#" \
    javac.in > javac
install -Dm755 -t "$dir_install/lib/jvm/bin" javac