#!/usr/bin/env bash

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

DESC=libc++
source tools/tools.sh

if [ `echo "${OSXCROSS_SDK_VERSION}<10.7" | bc -l` -eq 1 ]; then
    echo "you must use the SDK from 10.7 or newer to get $DESC compiled"
    exit 1
fi

# libc++ version to build
LIBCXX_VERSION=3.4

require wget
require cmake

pushd $OSXCROSS_BUILD_DIR &>/dev/null

function remove_locks()
{
    rm -f $OSXCROSS_BUILD_DIR/have_libcxx*
}

source $BASE_DIR/tools/trap_exit.sh

if [ ! -f "have_libcxx_${LIBCXX_VERSION}_${OSXCROSS_TARGET}" ]; then

pushd $OSXCROSS_TARBALL_DIR &>/dev/null
wget -c "http://llvm.org/releases/${LIBCXX_VERSION}/libcxx-${LIBCXX_VERSION}.src.tar.gz"
popd &>/dev/null

extract "$OSXCROSS_TARBALL_DIR/libcxx-${LIBCXX_VERSION}.src.tar.gz"
pushd libcxx-${LIBCXX_VERSION}* &>/dev/null
rm -rf build
mkdir build

pushd build &>/dev/null

# remove conflicting versions
rm -rf $OSXCROSS_SDK/usr/include/c++/v1
rm -rf $OSXCROSS_SDK/usr/lib/libc++.dylib
rm -rf $OSXCROSS_SDK/usr/lib/libc++.*.dylib

rm -rf $OSXCROSS_SDK/../libcxx_$OSXCROSS_SDK_VERSION

function cmake_error()
{
    echo -e "\e[1m"
    echo "It looks like CMake failed."
    echo "If you see something like:"
    echo -e "\e[31m"
    echo "CMake Error at /usr/share/cmake-2.8/Modules/Platform/Darwin.cmake:<LINE NUMBER> (list):"
    echo "  list sub-command REMOVE_DUPLICATES requires list to be present."
    echo -e "\e[0m\e[1m"
    echo "Then either remove that line (look for the LINE NUMBER) or comment it out (with #) in /usr/share/cmake-.../Modules/Platform/Darwin.cmake"
    echo "It appears to be a bug in CMake."
    echo ""
    echo "Then re-run this script."
    echo -e "\e[0m"
    exit 1
}

export BUILD_LIBCXX=1

cmake .. \
    -DCMAKE_CXX_COMPILER=x86_64-apple-$OSXCROSS_TARGET-clang++ \
    -DCMAKE_C_COMPILER=x86_64-apple-$OSXCROSS_TARGET-clang \
    -DCMAKE_SYSTEM_NAME=Darwin \
    -DCMAKE_OSX_SYSROOT=$OSXCROSS_SDK \
    -DLIBCXX_ENABLE_SHARED=No \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=$OSXCROSS_SDK/../libcxx_$OSXCROSS_SDK_VERSION \
    -DCMAKE_AR=$OSXCROSS_CCTOOLS_PATH/x86_64-apple-$OSXCROSS_TARGET-ar \
    -DCMAKE_RANLIB=$OSXCROSS_CCTOOLS_PATH/x86_64-apple-$OSXCROSS_TARGET-ranlib \
    -DCMAKE_CXX_FLAGS="-arch i386 -arch x86_64" || cmake_error

export BUILD_LIBCXX=2

make -j$JOBS
make install -j$JOBS

unset BUILD_LIBCXX

popd &>/dev/null # build
popd &>/dev/null # libcxx

touch "have_libcxx_${LIBCXX_VERSION}_${OSXCROSS_TARGET}"

fi # have libcxx

popd &>/dev/null # build dir

function test_compiler_clang()
{
    echo -ne "testing $2 -stdlib=libc++ ... "
    $1 $3 -O2 -stdlib=libc++ -std=c++11 -Wall -o test
    rm test
    echo "ok"
}

function test_compiler_gcc()
{
    echo -ne "testing $2 ... "
    $1 $3 -O2 -std=c++0x -Wall -o test
    rm test
    echo "ok"
}

HAVE_GCC=0

echo ""
echo "testing libc++ (including a lot c++11 headers + linking a small test program)"
echo ""

test_compiler_clang i386-apple-$OSXCROSS_TARGET-clang++ o32-clang++ $BASE_DIR/oclang/test_libcxx.cpp
test_compiler_clang x86_64-apple-$OSXCROSS_TARGET-clang++ o64-clang++ $BASE_DIR/oclang/test_libcxx.cpp

which i386-apple-$OSXCROSS_TARGET-g++-libc++ &>/dev/null && \
    HAVE_GCC=1 && \
    test_compiler_gcc i386-apple-$OSXCROSS_TARGET-g++-libc++ o32-g++-libc++ $BASE_DIR/oclang/test_libcxx.cpp

which x86_64-apple-$OSXCROSS_TARGET-g++-libc++ &>/dev/null && \
    HAVE_GCC=1 && \
    test_compiler_gcc x86_64-apple-$OSXCROSS_TARGET-g++-libc++ o64-g++-libc++ $BASE_DIR/oclang/test_libcxx.cpp

echo ""
echo "Done!"
echo ""
echo "Example usage:"
echo ""
if [ $HAVE_GCC -eq 1 ]; then
echo "Clang:"
echo ""
fi
echo "Example 1: o32-clang++ -stdlib=libc++ -Wall test.cpp -o test"
echo "Example 2: o64-clang++ -stdlib=libc++ -std=c++11 -Wall test.cpp"
echo "Example 3: o32-clang++-libc++ -Wall test.cpp -o test"
echo "Example 4: o64-clang++-libc++ -std=c++11 -Wall test.cpp -o test"
echo "Example 5: x86_64-apple-$OSXCROSS_TARGET-clang++-libc++ -Wall test.cpp -o test"
echo "Example 6: i386-apple-$OSXCROSS_TARGET-clang++-libc++ -std=c++11 -Wall test.cpp -o test"
echo ""
if [ $HAVE_GCC -eq 1 ]; then
echo "GCC:"
echo ""
echo "Example 1: o32-g++-libc++ -Wall test.cpp -o test"
echo "Example 2: o64-g++-libc++ -std=c++1y -Wall test.cpp -o test"
echo "Example 3: x86_64-apple-$OSXCROSS_TARGET-g++-libc++ -Wall test.cpp -o test"
echo "Example 4: i386-apple-$OSXCROSS_TARGET-g++-libc++ -std=c++1y -Wall test.cpp -o test"
echo ""
fi