#!/bin/bash
[% c("var/set_default_env") -%]
distdir=/var/tmp/dist/[% project %]
mkdir -p /var/tmp/dist
tar -C /var/tmp/dist -xf [% c('input_files_by_name/clang') %]
tar -C /var/tmp/dist -xf [% c('input_files_by_name/cmake') %]
tar -C /var/tmp/dist -xf [% c('input_files_by_name/ninja') %]
export PATH="/var/tmp/dist/clang/bin:/var/tmp/dist/ninja:/var/tmp/dist/cmake/bin:$PATH"

[% pc(c('var/compiler'), 'var/setup', { compiler_tarfile => c('input_files_by_name/' _ c('var/compiler')) }) %]

mkdir -p /var/tmp/build
cd /var/tmp/build
tar -xf $rootdir/[% c('input_files_by_name/clang-source') %]
cd clang-source
export LLVM_HOME=$(pwd)

llvm_major="[% pc('llvm-project', 'var/llvm_major') %]"
mkdir -p $distdir/lib/clang/$llvm_major/lib/linux/

# Same trick as Mozilla: use an empty runtime because it is used only for tests
mkdir /var/tmp/build/rt
touch /var/tmp/build/rt/libgcc.a

installdir=/var/tmp/build/install

build_runtimes() {
  mkdir -p "$installdir"
  cd $LLVM_HOME
  arch=$1
  if [[ "$arch" == "armv7" ]]; then
    arch="arm"
  fi
  api_level=21
  target="$1-linux-android$api_level"
  libdir=$arch
  if [[ "$arch" == "i686" ]]; then
    libdir="i386"
  fi
  ## Common flags (from taskcluster/scripts/misc/build-llvm-common.sh)
  COMMON_CMAKE_FLAGS="
    -DCMAKE_INSTALL_PREFIX=$installdir
    -DCMAKE_C_COMPILER_TARGET=$target
    -DCMAKE_CXX_COMPILER_TARGET=$target
    -DCMAKE_ASM_COMPILER_TARGET=$target
    -DCMAKE_BUILD_TYPE=Release
    -DLLVM_ENABLE_ASSERTIONS=OFF
    -DLLVM_CONFIG_PATH=/var/tmp/dist/clang/bin/llvm-config
    -DCMAKE_SYSROOT=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/sysroot
    -DCMAKE_LINKER=/var/tmp/dist/clang/bin/ld.lld
    -DCMAKE_SHARED_LINKER_FLAGS=-fuse-ld=lld
    -DANDROID=1
    -DANDROID_NATIVE_API_LEVEL=$api_level
    -DSANITIZER_ALLOW_CXXABI=OFF
    -DLLVM_DEFAULT_TARGET_TRIPLE=$arch-unknown-linux-android
    -DCMAKE_C_COMPILER=/var/tmp/dist/clang/bin/clang
    -DCMAKE_CXX_COMPILER=/var/tmp/dist/clang/bin/clang++
    -DCMAKE_AR=/var/tmp/dist/clang/bin/llvm-ar
    -DCMAKE_RANLIB=/var/tmp/dist/clang/bin/llvm-ranlib
  "

  ## compiler-rt

  mkdir "build-compiler-rt-$arch"
  cd "build-compiler-rt-$arch"

  cmake ../compiler-rt/ -GNinja \
    -DCMAKE_EXE_LINKER_FLAGS='-fuse-ld=lld --rtlib=libgcc -L /var/tmp/build/rt' \
    -DCOMPILER_RT_BUILD_BUILTINS=ON \
    -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
    -DCOMPILER_RT_BUILD_MEMPROF=OFF \
    -DCOMPILER_RT_BUILD_ORC=OFF \
    -DCOMPILER_RT_BUILD_PROFILE=OFF \
    -DCOMPILER_RT_BUILD_SANITIZERS=OFF \
    -DCOMPILER_RT_BUILD_XRAY=OFF \
    $COMMON_CMAKE_FLAGS

  ninja -j[% c("num_procs") %] -v install

  ## libunwind

  cd /var/tmp/build/clang-source
  mkdir "build-runtimes-$arch"
  cmake -G Ninja -S runtimes -B "build-runtimes-$arch" \
    -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON \
    -DCMAKE_C_COMPILER_WORKS=1 \
    -DCMAKE_CXX_COMPILER_WORKS=1 \
    -DLLVM_ENABLE_RUNTIMES=libunwind \
    -DLIBUNWIND_ENABLE_SHARED=OFF \
    $COMMON_CMAKE_FLAGS

  cd "build-runtimes-$arch"
  ninja -j[% c("num_procs") %] -v install

  mv $installdir/lib/linux/* $distdir/lib/clang/$llvm_major/lib/linux/
  # We are not copying libunwind's headers, but they should not be needed.
  libunwind=$(find $installdir/lib -name libunwind.a)
  mkdir $distdir/lib/clang/$llvm_major/lib/linux/$libdir/
  mv $libunwind $distdir/lib/clang/$llvm_major/lib/linux/$libdir/
  rm -rf "$installdir"
}

build_runtimes armv7
build_runtimes aarch64
build_runtimes i686
build_runtimes x86_64

cd /var/tmp/dist
[% c('tar', {
    tar_src => [ project ],
    tar_args => '-czf ' _ dest_dir _ '/' _ c('filename'),
  }) %]
