llvm_utils

#!bin/bash

function setup_llvm() {
  target=$1

  # prepare links for llvm tools
  cd $src_dir/llvm/tools
  if [ ! -h clang ]; then
    ln -s ../../clang clang
  fi
  if [ ! -h lld ]; then
    ln -s ../../lld lld
  fi
  if [ ! -h lldb ]; then
    ln -s ../../lldb lldb
  fi

  build_directory=$bld_dir/llvm

  mkdir -p $build_directory
  pushd $build_directory
  cmake -G "Ninja" \
    -DCMAKE_INSTALL_PREFIX="$prefix" \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_EXPORT_COMPILE_COMMANDS=On \
    -DLLVM_TARGETS_TO_BUILD=Mips \
    -DLLVM_TARGET_ARCH=Mips \
    -DLLVM_DEFAULT_TARGET_TRIPLE="$target" \
    $src_dir/llvm
  ninja install
  popd

  pushd $prefix/bin
  ln -sf clang ${target}-clang
  ln -sf clang++ ${target}-clang++
  popd
}

function setup_musl_headers() {
  build_directory=$bld_dir/$multilib/$abi/musl
  cp -fRL $src_dir/musl $build_directory

  cat >$build_directory/config.mak <<EOF
ARCH=mips
prefix=$prefix/sysroot/$multilib/usr
EOF

  make -C $build_directory -j4 install-headers
}

function setup_linux_headers() {
  build_directory=$src_dir/linux

  make -C $build_directory \
    headers_install ARCH=mips INSTALL_HDR_PATH=$prefix/sysroot/$multilib/usr
}

function setup_compiler_rt() {
  build_directory=$bld_dir/$multilib/$abi/compiler-rt
  mkdir -p $build_directory
  pushd $build_directory

  C_FLAGS="${CCC_FLAGS} -nostdlib"
  CXX_FLAGS="$C_FLAGS"

  CLANG_VERSION=`llvm-config --version | sed -e 's/svn//'`

  case $abi in
    32|n32)
      SIZEOF_VOID_P=4 ;;
    64)
      SIZEOF_VOID_P=8 ;;
  esac

  cmake -G "Ninja" \
    -DCMAKE_INSTALL_PREFIX=$prefix/lib/clang/${CLANG_VERSION}/$multilib \
    -DLLVM_LIBDIR_SUFFIX="$libsuffix" \
    -DCMAKE_SYSTEM_NAME=Linux \
    -DCMAKE_C_COMPILER_FORCED=True \
    -DCMAKE_C_COMPILER=${target}-clang \
    -DCMAKE_C_FLAGS="$C_FLAGS" \
    -DCMAKE_CXX_COMPILER_FORCED=True \
    -DCMAKE_SIZEOF_VOID_P=$SIZEOF_VOID_P \
    -DCOMPILER_RT_DEFAULT_TARGET_TRIPLE="$target" \
    -DCOMPILER_RT_BUILD_SANITIZERS=Off \
  $src_dir/compiler-rt

  ninja install

  popd
}

function setup_musl() {
  build_directory=$bld_dir/$multilib/$abi/musl
  pushd $build_directory

  export CROSS_COMPILE=${target}-
  export LIBCC="--rtlib=compiler-rt"

  ./configure \
      CC=${target}-clang CFLAGS="$CCC_FLAGS -fuse-ld=ld" LD_FLAGS="$CFLAGS" \
      --prefix=$prefix/sysroot/$multilib/usr \
      --disable-debug --enable-warnings --enable-wrapper=all \
      --enable-shared --target=$target \
      --syslibdir="$prefix/sysroot/$multilib/lib${libsuffix}" \
      --libdir="$prefix/sysroot/$multilib/usr/lib${libsuffix}"

  make -j8
  make install
  popd
}

function setup_libunwind() {
  build_directory=$bld_dir/$multilib/$abi/libunwind

  mkdir -p $build_directory
  pushd $build_directory

  CMAKE_FLAGS="-DCMAKE_INSTALL_PREFIX=$prefix/sysroot/$multilib/usr"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_BUILD_TYPE=Debug"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_C_COMPILER=${target}-clang"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER_FORCED=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER=${target}-clang++"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_ENABLE_LIBCXX=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCXX_SUPPORTS_CXX11=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_HAS_FUNWIND_TABLES=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_HAS_FPIC_FLAG=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_HAS_NO_EXCEPTIONS_FLAG=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_HAS_NO_RTTI_FLAG=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_HAS_FSTRICT_ALIASING_FLAG=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_HAS_NODEFAULTLIBS_FLAG=True"

  cmake -G "Ninja" \
    $CMAKE_FLAGS \
    -DCMAKE_C_FLAGS="$CCC_FLAGS" \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS" \
  $src_dir/libunwind
  ninja install

  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBUNWIND_ENABLE_SHARED=False"
  cmake -G "Ninja" \
    $CMAKE_FLAGS \
    -DCMAKE_C_FLAGS="$CCC_FLAGS" \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS" \
  $src_dir/libunwind
  ninja install

  popd
}

function setup_libcxx() {
  build_directory=$bld_dir/$multilib/$abi/libcxx
  mkdir -p $build_directory
  pushd $build_directory

  CMAKE_FLAGS="-DCMAKE_INSTALL_PREFIX=$prefix/sysroot/$multilib/usr"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_BUILD_TYPE=Debug"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_C_COMPILER=${target}-clang"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER_FORCED=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER=${target}-clang++"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=Off"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_HAS_MUSL_LIBC=On"

  cmake -G "Ninja" \
    $CMAKE_FLAGS \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS -Wno-invalid-constexpr -nostdinc++ -nodefaultlibs" \
  $src_dir/libcxx
  ninja install

  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_ENABLE_SHARED=Off"

  cmake -G "Ninja" \
    $CMAKE_FLAGS \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS -Wno-invalid-constexpr -nostdinc++ -nodefaultlibs" \
  $src_dir/libcxx
  ninja install

  popd
}

function setup_libcxxabi() {
  build_directory=$bld_dir/$multilib/$abi/libcxxabi

  mkdir -p $build_directory
  pushd $build_directory

  cmake -G "Ninja" \
    -DCMAKE_INSTALL_PREFIX=$prefix/sysroot/$multilib/usr \
    -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_C_COMPILER=${target}-clang \
    -DCMAKE_CXX_COMPILER_FORCED=True \
    -DCMAKE_CXX_COMPILER=${target}-clang++ \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS" \
    -DLIBCXXABI_USE_LLVM_UNWINDER=On \
    -DLIBCXXABI_LIBCXX_INCLUDES=$prefix/sysroot/$multilib/usr/include/c++/v1 \
    -DLIBCXXABI_LIBUNWIND_PATH=$src_dir/libunwind \
    -DCXX_SUPPORTS_CXX11=True \
    -DLLVM_ENABLE_LIBCXX=True \
    -DLIBCXXABI_HAS_WALL_FLAG=True \
    -DLIBCXXABI_HAS_FPIC_FLAG=True \
    -DLIBCXXABI_HAS_FSTRICT_ALIASING_FLAG=True \
    -DLIBCXXABI_HAS_NODEFAULTLIBS_FLAG=True \
    -DLIBCXXABI_HAS_NOSTDINCXX_FLAG=True \
  $src_dir/libcxxabi

  ninja install

  popd
}

function setup_libcxx_with_libcxxabi() {
  build_directory=$bld_dir/$multilib/$abi/libcxx_with_libcxxabi

  mkdir -p $build_directory
  pushd $build_directory

  CMAKE_FLAGS="-DCMAKE_INSTALL_PREFIX=$prefix/sysroot/$multilib/usr"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_BUILD_TYPE=Debug"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_C_COMPILER=${target}-clang"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER_FORCED=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER=${target}-clang++"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=Off"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_CXX_ABI_INCLUDE_PATHS=$src_dir/libcxxabi/include"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_CXX_ABI=libcxxabi"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_HAS_MUSL_LIBC=On"

  cmake -G "Ninja" \
    $CMAKE_FLAGS \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS -Wno-invalid-constexpr" \
  $src_dir/libcxx
  ninja install

  CMAKE_FLAGS="$CMAKE_FLAGS -DLIBCXX_ENABLE_SHARED=Off"
  cmake -G "Ninja" \
    $CMAKE_FLAGS \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS -Wno-invalid-constexpr" \
  $src_dir/libcxx
  ninja install

  popd
}

function setup_lldb() {
  build_directory=$bld_dir/$multilib/$abi/lldb
  mkdir -p $build_directory
  pushd $build_directory

  CMAKE_FLAGS="-DCMAKE_INSTALL_PREFIX=$prefix/sysroot/$multilib/usr"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_BUILD_TYPE=Release"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_C_COMPILER=$target-clang"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CXX_COMPILER=$target-clang++"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_TARGETS_TO_BUILD=Mips"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_TARGET_ARCH=Mips"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_DEFAULT_TARGET_TRIPLE=$target"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_TABLEGEN=$bld_dir/llvm/bin/llvm-tblgen"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCLANG_TABLEGEN=$bld_dir/llvm/bin/clang-tblgen"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_CROSSCOMPILING=True"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_FIND_ROOT_PATH=$TC_DIR/sysroot/$multilib"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY"
  CMAKE_FLAGS="$CMAKE_FLAGS -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY"
  CMAKE_FLAGS="$CMAKE_FLAGS -DBUILD_SHARED_LIBS=Off"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_ENABLE_SHARED=Off"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLDB_DISABLE_LIBEDIT=1"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLDB_DISABLE_CURSES=1"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLDB_DISABLE_PYTHON=1"
  CMAKE_FLAGS="$CMAKE_FLAGS -DLLVM_ENABLE_TERMINFO=0"

  cmake -G "Ninja" $CMAKE_FLAGS \
    -DCMAKE_C_FLAGS="$CCC_FLAGS -fuse-ld=ld" \
    -DCMAKE_CXX_FLAGS="$CCC_FLAGS -fuse-ld=ld" \
  $src_dir/llvm
  ninja lldb-server
  cp bin/lldb-server $prefix/bin/lldb-server-$multilib

  popd
}

function get_cc_flags_from_multilib_and_abi() {
  # {micro}mips{el}[-r1|-r2|-r6]{-mips16}[-soft|-hard]{-nan2008}{musl,glibc,ulibc}
  case $multilib in
    micromips*)
      echo -n " -mmicromips" ;;
  esac

  case $multilib in
    *mips-*) echo -n " -EB" ;;
    *mipsel-*) echo -n " -EL" ;;
  esac

  echo -n " -mabi=$abi"
  case $abi in
    32) echo -n " -target mips-mti-linux -mips32" ;;
    n32|64) echo -n " -target mips64-mti-linux -mips64" ;;
  esac

  case $multilib in
    *-r1-*) echo -n "" ;;
    *-r2-*) echo -n "r2" ;;
    *-r3-*) echo -n "r3" ;;
    *-r6-*) echo -n "r6" ;;
  esac

  case $multilib in
    *-mips16-*) echo -n " -mips16" ;;
  esac

  case $multilib in
    *-soft*) echo -n " -msoft-float" ;;
    *-hard*) echo -n " -mhard-float" ;;
  esac

  # always use PIC.
  echo -n " -fPIC"
}

function build_multilib() {
  local multilib=$1 abi=$2 libsuffix=""

  case $abi in
    32) libsuffix="" ;;
    n32) libsuffix="32" ;;
    64) libsuffix="64" ;;
  esac

  local CCC_FLAGS=`get_cc_flags_from_multilib_and_abi`

  rm -rf $bld_dir/$multilib/$abi
  mkdir -p $bld_dir/$multilib/$abi

  setup_linux_headers
  setup_musl_headers
  setup_compiler_rt
  setup_musl
  setup_libcxx
  setup_libunwind
  setup_libcxxabi
  setup_libcxx_with_libcxxabi
  #setup_lldb
}

function build_llvm_component() {
  component=$1
  local target=$2
  local src_dir=$TOPDIR/$src_dir

  set -e
  case $component/$target in
    llvm/*|clang/*)
      setup_llvm $target
      ;;
    llvm_multilibs/*)
      build_multilib mips-r2-hard-musl 32
      build_multilib mipsel-r2-hard-musl 32
      ;;
    *)
      echo "Bad LLVM build component/target ($component/$target)";
      exit 1 ;;
  esac
  set +e
}