#!/usr/bin/env bash

pushd "${0%/*}" &>/dev/null

export LC_ALL="C"
export LIBRARY_PATH=""

export CC=clang
export CXX=clang++

`tools/osxcross_conf.sh`

if [ $? -ne 0 ]; then
    echo "you need to complete ./build.sh first, before you can start building gcc"
    exit 1
fi

set -e

# How many concurrent jobs should be used for compiling?
JOBS=`tools/get_cpu_count.sh`

# GCC version to build
# (<4.7 will not work properly with libc++)
GCC_VERSION=4.8.2

# GCC mirror
GCC_MIRROR="ftp://ftp.gwdg.de/pub/misc/gcc/releases"

function require
{
    which $1 &>/dev/null
    while [ $? -ne 0 ]
    do
        echo ""
        read -p "Install $1 then press enter"
        which $1 &>/dev/null
    done
}

set +e
require wget
set -e

BASE_DIR=`pwd`

pushd $OSXCROSS_BUILD_DIR

trap 'test $? -eq 0 || rm -f $OSXCROSS_BUILD_DIR/have_gcc*' EXIT

if [ ! -f "have_gcc_${GCC_VERSION}_${OSXCROSS_TARGET}" ]; then

pushd $OSXCROSS_TARBALL_DIR
wget -c "$GCC_MIRROR/gcc-$GCC_VERSION/gcc-$GCC_VERSION.tar.bz2"
popd

echo "cleaning up ..."
rm -rf gcc* 2>/dev/null

echo "extracting gcc ..."
tar xf "$OSXCROSS_TARBALL_DIR/gcc-$GCC_VERSION.tar.bz2"

pushd gcc*$GCC_VERSION*

rm -f $OSXCROSS_TARGET_DIR/bin/*-gcc*
rm -f $OSXCROSS_TARGET_DIR/bin/*-g++*

patch -p0 < $OSXCROSS_PATCH_DIR/gcc-dsymutil.patch

mkdir -p build
pushd build

if [ "`uname -s`" == "FreeBSD" ]; then
    export CPATH="/usr/local/include"
    export LIBRARY_PATH="/usr/local/lib"
    MAKE=gmake
    IS_FREEBSD=1
else
    MAKE=make
    IS_FREEBSD=0
fi

require $MAKE

../configure \
    --target=x86_64-apple-$OSXCROSS_TARGET \
    --with-ld=$OSXCROSS_TARGET_DIR/bin/x86_64-apple-$OSXCROSS_TARGET-ld \
    --with-as=$OSXCROSS_TARGET_DIR/bin/x86_64-apple-$OSXCROSS_TARGET-as \
    --with-sysroot=$OSXCROSS_SDK \
    --disable-nls \
    --enable-languages=c,c++,objc,obj-c++ \
    --without-headers \
    --enable-multilib \
    --enable-lto \
    --prefix=$OSXCROSS_TARGET_DIR

if [ $IS_FREEBSD -eq 1 ]; then
    export LIBRARY_PATH=""
fi

$MAKE -j$JOBS
$MAKE install -j$JOBS

popd #build
popd #gcc

touch "have_gcc_${GCC_VERSION}_${OSXCROSS_TARGET}"

fi #have gcc

popd #build dir

WRAPPER=$OSXCROSS_TARGET_DIR/bin/x86_64-apple-${OSXCROSS_TARGET}-ogcc
cp ogcc/ogcc $WRAPPER

WRAPPER_SCRIPT=`basename $WRAPPER`
WRAPPER_DIR=`dirname $WRAPPER`

pushd $WRAPPER_DIR

if [ ! -f i386-apple-$OSXCROSS_TARGET-base-gcc ]; then
    mv x86_64-apple-$OSXCROSS_TARGET-gcc x86_64-apple-$OSXCROSS_TARGET-base-gcc
    mv x86_64-apple-$OSXCROSS_TARGET-g++ x86_64-apple-$OSXCROSS_TARGET-base-g++

    ln -sf x86_64-apple-$OSXCROSS_TARGET-base-gcc i386-apple-$OSXCROSS_TARGET-base-gcc
    ln -sf x86_64-apple-$OSXCROSS_TARGET-base-g++ i386-apple-$OSXCROSS_TARGET-base-g++
fi

ln -sf $WRAPPER_SCRIPT o32-gcc
ln -sf $WRAPPER_SCRIPT o32-g++
ln -sf $WRAPPER_SCRIPT o32-g++-libc++

ln -sf $WRAPPER_SCRIPT o64-gcc
ln -sf $WRAPPER_SCRIPT o64-g++
ln -sf $WRAPPER_SCRIPT o64-g++-libc++

ln -sf $WRAPPER_SCRIPT i386-apple-$OSXCROSS_TARGET-gcc
ln -sf $WRAPPER_SCRIPT i386-apple-$OSXCROSS_TARGET-g++
ln -sf $WRAPPER_SCRIPT i386-apple-$OSXCROSS_TARGET-g++-libc++

ln -sf $WRAPPER_SCRIPT x86_64-apple-$OSXCROSS_TARGET-gcc
ln -sf $WRAPPER_SCRIPT x86_64-apple-$OSXCROSS_TARGET-g++
ln -sf $WRAPPER_SCRIPT x86_64-apple-$OSXCROSS_TARGET-g++-libc++

popd #wrapper dir

function test_compiler
{
    echo -ne "testing $1 ... "
    $1 $2 -O2 -Wall -o test
    rm test
    echo "works"
}

echo ""

test_compiler o32-gcc $BASE_DIR/oclang/test.c
test_compiler o64-gcc $BASE_DIR/oclang/test.c

test_compiler o32-g++ $BASE_DIR/oclang/test.cpp
test_compiler o64-g++ $BASE_DIR/oclang/test.cpp

echo ""

echo "Done! Now you can use o32-gcc/o32-g++ and o64-gcc/o64-g++ as compiler"
echo ""
echo "Example usage:"
echo ""
echo "Example 1: CC=o32-gcc ./configure --host=i386-apple-$OSXCROSS_TARGET"
echo "Example 2: CC=i386-apple-$OSXCROSS_TARGET-gcc ./configure --host=i386-apple-$OSXCROSS_TARGET"
echo "Example 3: o64-gcc -Wall test.c -o test"
echo "Example 4: x86_64-apple-$OSXCROSS_TARGET-strip -x test"
echo ""