#!/bin/bash

# version of clang we want to use
CLANG_VERSION=5.0
# version of libcxx and libcxxabi we want to use
CXX_VERSION=5.0.2

# Steps specific to our CI environment
# CI runs on Ubuntu 14.04, we need to install clang-5.0 and th
# appropriate libc++ ourselves
if [ "$KOKORO_BUILD_ID" ]; then
    sudo ln -s /usr/include/x86_64-linux-gnu/asm /usr/include/asm

    sudo apt-add-repository "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-$CLANG_VERSION main"
    sudo apt-get update -y
    sudo apt-get --assume-yes --force-yes install clang-$CLANG_VERSION

    mkdir -p clang
    cd clang

    # download LLVM sources
    curl -O http://releases.llvm.org/$CXX_VERSION/llvm-$CXX_VERSION.src.tar.xz
    tar xf llvm-$CXX_VERSION.src.tar.xz
    mv llvm-$CXX_VERSION.src llvm_src

    # download libc++ sources
    curl -O http://releases.llvm.org/$CXX_VERSION/libcxx-$CXX_VERSION.src.tar.xz
    tar xf libcxx-$CXX_VERSION.src.tar.xz
    mv libcxx-$CXX_VERSION.src llvm_src/projects/libcxx

    # download libc++abi sources
    curl -O http://releases.llvm.org/$CXX_VERSION/libcxxabi-$CXX_VERSION.src.tar.xz
    tar xf libcxxabi-$CXX_VERSION.src.tar.xz
    mv libcxxabi-$CXX_VERSION.src llvm_src/projects/libcxxabi

    mkdir -p build
    cd build

    export CC=/usr/bin/clang-$CLANG_VERSION
    export CXX=/usr/bin/clang++-$CLANG_VERSION

    # prepare makefiles
    cmake \
        -DCMAKE_BUILD_TYPE=Release \
        -DLIBCXX_ENABLE_RTTI=YES \
        -DLIBCXX_ENABLE_EXCEPTIONS=YES \
        -DLIBCXX_USE_COMPILER_RT=NO \
        -DLIBCXXABI_USE_COMPILER_RT=NO \
        ../llvm_src

    # compile libraries
    make -j cxx
    make -j cxxabi

    # install libraries
    (cd projects/libcxx && sudo make -j install)
    (cd projects/libcxxabi && sudo make -j install)

    cd ../..

    export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
    export LIBRARY_PATH=/usr/local/lib:$LIBRARY_PATH

    # set to true to link against libc++abi
    export FILAMENT_REQUIRES_CXXABI=true
fi

wget -q https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
unzip -q ninja-linux.zip
export PATH="$PWD:$PATH"