build_llvm.sh

#!/bin/bash

BRANCH=release_50
ROOT=`pwd`
SRC=$ROOT/llvm
# GIT_BASE_URL=https://llvm.org/git
if [[ "$GIT_BASE_URL" == "" ]]; then
  GIT_BASE_URL=https://github.com/llvm-mirror
fi
BUILDER=ninja
BUILD=$ROOT/build-$BUILDER
INSTALL=$ROOT/install-$BUILDER
UPGRADE_BRANCH=ON
ONLY_CONFIG=OFF

submodules=""
function add_submodule
{
  submodules="${submodules}|$1"
}
add_submodule clang
add_submodule clang-tools-extra
if [[ $SUB_MODULES ]]; then
  add_submodule $SUB_MODULES
fi
# add_submodule lldb
# add_submodule lld
# add_submodule polly
# add_submodule compiler-rt
# add_submodule libcxx
# add_submodule libcxxabi
# add_submodule test-suite

function pkg_install
{
  if [[ `type $1 >/dev/null 2>&1` ]]; then
    if [[ "`uname`" == "Darwin" ]]; then
      brew install $1
    else
      if [[ $2 ]]; then
        apt install -y $2
      else
        apt install -y $1
      fi
    fi
  else
    echo "checking $1... OK"
  fi
}

pkg_install make
pkg_install cmake
pkg_install llvm
pkg_install libxml2-dev
pkg_install libncurses-dev
pkg_install doxygen
pkg_install swig
pkg_install python-dev

if [[ "${BUILDER}" == "ninja" ]]; then
  pkg_install ninja, ninja-build
fi

if [[ "${SOURCE}" == "git" ]]; then
	pkg_install git
fi

function fetch {
  proj=$1
  dir=$proj
  if [[ $# > 1 ]]; then
    dir=$2
  fi
  if [[ "${submodules}" == *"|$proj"* ]]; then
    if [ -d $dir ]; then
      pushd $dir
      if [[ "${UPGRADE_BRANCH}" == "ON" ]]; then
        git reset --hard
        git pull
      fi
      popd
    else
      git clone ${GIT_BASE_URL}/$proj $dir
    fi
    pushd $dir
    if [[ "${BRANCH}" != "" ]]; then
      git checkout $BRANCH
    fi
    popd
  elif [[ "$proj" != "llvm" ]]; then
    rm -rf $dir
  fi
}

fetch llvm

pushd llvm # /llvm

fetch clang tools/clang
fetch clang-tools-extra tools/clang/tools/extra
fetch lldb tools/lldb
fetch lld tools/lld
fetch polly tools/polly
fetch compiler-rt projects/compiler-rt
fetch libcxx projects/libcxx
fetch libcxxabi projects/libcxxabi
fetch test-suite projects/test-suite

popd # /


mkdir -p $BUILD
cd $BUILD
rm -f CMakeCache.txt # cleanup
if [[ "${BUILDER}" == "ninja" ]]; then
	BUILDER_G=Ninja
elif [[ "${BUILDER}" == "make" ]]; then
	BUILDER_G="Unix Makefiles"
elif [[ "${BUILDER}" == "xcode" ]]; then
  BUILDER_G="Xcode"
fi
cmake -G ${BUILDER_G} ${SRC} \
	-DCMAKE_INSTALL_PREFIX="${INSTALL}" \
  -DLLVM_TARGETS_TO_BUILD="ARM;X86" \
  -DCMAKE_BUILD_TYPE="Release" \
  # -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
	# -DLLVM_PARALLEL_COMPILE_JOBS=4 \
  # -DLLVM_PARALLEL_LINK_JOBS=4 \
  # -DCMAKE_BUILD_TYPE="Debug" \
  # -DCMAKE_C_COMPILER=clang \
	# -DCMAKE_CXX_COMPILER=clang++ \
	# -DCMAKE_ASM_COMPILER=clang \
  # -DLLVM_ENABLE_PIC=OFF \
	
if [[ "${ONLY_CONFIG}" == "ON" ]]; then
  exit
fi

if [[ "${BUILDER}" == "ninja" ]]; then
	ninja && ninja install
fi

if [[ "${BUILDER}" == "make" ]]; then
	make && make install
fi