# Description: WASI LLVM compiler runtime
# URL: https://compiler-rt.llvm.org/
# Maintainer: John McQuah, jmcquah at disroot dot org
# Depends on: wasi-libc

name=wasi-compiler-rt
version=18.1.3
release=1
source=(https://github.com/llvm/llvm-project/releases/download/llvmorg-$version/compiler-rt-$version.src.tar.xz
  https://github.com/llvm/llvm-project/releases/download/llvmorg-$version/llvm-$version.src.tar.xz
  https://github.com/llvm/llvm-project/releases/download/llvmorg-$version/cmake-$version.src.tar.xz
  wasi-toolchain.cmake)

build() {
  # Platform files have been copied from https://github.com/WebAssembly/wasi-sdk
  mv llvm-$version.src llvm
  mv cmake-$version.src cmake
  mkdir cmake/Platform
  echo "set(WASI 1)" > cmake/Platform/WASI.cmake

  cmake -S compiler-rt-$version.src/lib/builtins -B build -G Ninja \
    -D CMAKE_INSTALL_PREFIX="/usr/lib/clang/${version%%.*}" \
    -D COMPILER_RT_INSTALL_PATH="/usr/lib/clang/${version%%.*}" \
    -D CMAKE_BUILD_TYPE=Release \
    -D CMAKE_C_FLAGS='-O3 -DNDEBUG -fno-exceptions --sysroot=/usr/share/wasi-sysroot' \
    -D CMAKE_MODULE_PATH="$SRC/cmake" \
    -D CMAKE_TOOLCHAIN_FILE="$SRC/wasi-toolchain.cmake" \
    -D COMPILER_RT_BAREMETAL_BUILD=ON \
    -D COMPILER_RT_INCLUDE_TESTS=OFF \
    -D COMPILER_RT_HAS_FPIC_FLAG=OFF \
    -D COMPILER_RT_DEFAULT_TARGET_ONLY=ON \
    -D COMPILER_RT_OS_DIR=wasi \
    -D WASI_SDK_PREFIX=/usr

  cmake --build build
  DESTDIR=$PKG cmake --install build

  /usr/bin/llvm-strip --strip-debug $PKG/usr/lib/clang/${version%%.*}/lib/wasi/libclang_rt.builtins-wasm32.a
}