# This is the source.sh script. It is executed by BPM in a temporary directory when compiling a source package
# BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
# BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT

# The prepare function is executed in the root of the temp directory
# This function is used for putting downloaded files to the correct location or applying patches
prepare() {
  cd "$BPM_SOURCE"/tools
  patch -Np1 -i "$BPM_WORKDIR"/enable-fstack-protector-strong-by-default.patch
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  export CC=gcc CXX=g++
  cmake -B build -DCMAKE_INSTALL_PREFIX=/usr      \
        -DCMAKE_BUILD_TYPE=Release                \
        -DCMAKE_SKIP_INSTALL_RPATH=ON             \
        -DLLVM_ENABLE_FFI=ON                      \
        -DLLVM_BUILD_LLVM_DYLIB=ON                \
        -DLLVM_LINK_LLVM_DYLIB=ON                 \
        -DLLVM_ENABLE_RTTI=ON                     \
        -DLLVM_BINUTILS_INCDIR=/usr/include       \
        -DLLVM_INCLUDE_BENCHMARKS=OFF             \
        -DCLANG_DEFAULT_PIE_ON_LINUX=ON           \
        -DCLANG_CONFIG_FILE_SYSTEM_DIR=/etc/clang \
        -Wno-dev -G Ninja
  cmake --build build
}

_pick() {
  local p="$1" f d; shift
  for f; do
    [ -d "$BPM_WORKDIR"/output_"$p" ] || { echo "Split package $p not found"; exit 1; } 
    d="$BPM_WORKDIR"/output_"$p"/"${f#$BPM_OUTPUT}"
    mkdir -p "$(dirname "$d")"
    mv "$f" "$d"
    rmdir -p --ignore-fail-on-non-empty "$(dirname "$f")"
  done
}

# The package function is executed in the source directory
# This function is used to move the compiled files into the output directory
package_llvm() {
  DESTDIR="$BPM_OUTPUT" cmake --install build

  # Install missing binary
  install -Dm755 "$BPM_SOURCE"/build/bin/FileCheck "$BPM_OUTPUT"/usr/bin/FileCheck

  cd "$BPM_OUTPUT"

  # Move compiler-rt files into split packag
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/bin/hwasan_symbolize
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/include/fuzzer
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/include/orc
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/include/profile
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/include/sanitizer
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/include/xray
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/lib
  _pick compiler-rt usr/lib/clang/${BPM_PKG_VERSION%%.*}/share

  # Move clang files into split package
  _pick clang usr/bin/{amdgpu-arch,analyze-build,c-index-test,diagtool,git-clang-format,hmaptool,intercept-build,nvptx-arch,scan-build,scan-build-py,scan-view}
  _pick clang usr/bin/clang*
  _pick clang usr/lib/libclang*
  _pick clang usr/lib/cmake/clang
  _pick clang usr/include/clang-c/
  _pick clang usr/include/clang
  _pick clang usr/lib/clang
  _pick clang usr/share/clang
  _pick clang usr/share/man/man1/scan-build.1
  _pick clang usr/share/scan-build
  _pick clang usr/share/scan-view

  # Move runtime libraries into split package
  for lib in libLLVM libLLVM-"${BPM_PKG_VERSION%%.*}" libLTO libRemarks; do
    _pick llvm-libs "$BPM_OUTPUT"/usr/lib/"$lib".so*
  done

  # Install package license
  install -Dm644 "$BPM_SOURCE"/LICENSE.TXT "$BPM_OUTPUT"/usr/share/licenses/llvm/LICENSE.TXT
}

package_llvm-libs() {
  # Install package license
  install -Dm644 "$BPM_SOURCE"/LICENSE.TXT "$BPM_OUTPUT"/usr/share/licenses/llvm-libs/LICENSE.TXT
}

package_compiler-rt() {
  # Install package license
  install -Dm644 "$BPM_SOURCE"/LICENSE.TXT "$BPM_OUTPUT"/usr/share/licenses/compiler-rt/LICENSE.TXT
}

package_clang() {
  # Install package license
  install -Dm644 "$BPM_SOURCE"/LICENSE.TXT "$BPM_OUTPUT"/usr/share/licenses/clang/LICENSE.TXT
}