# Description: WASI libc++ implementation for WebAssembly
# URL: https://libcxx.llvm.org/
# Maintainer: Danny Rawlins, crux at romster dot me
# Depends on: clang wasi-libc wasi-compiler-rt

name=wasi-libc++
version=13.0.1
release=1
source=(https://github.com/llvm/llvm-project/releases/download/llvmorg-$version/llvm-$version.src.tar.xz
        https://github.com/llvm/llvm-project/releases/download/llvmorg-$version/libcxx-$version.src.tar.xz
        https://github.com/llvm/llvm-project/releases/download/llvmorg-$version/libcxxabi-$version.src.tar.xz
	WASI.cmake
	wasi-toolchain.cmake)

build() {
	# Platform files have been copied from https://github.com/WebAssembly/wasi-sdk
	mkdir -p cmake/Platform
	cp WASI.cmake cmake/Platform
	mv libcxx-${version}.src libcxx
	mv libcxxabi-${version}.src libcxxabi
	mv llvm-${version}.src llvm

	# Build options are derived from https://github.com/WebAssembly/wasi-sdk/blob/main/Makefile
	# Currently, wasi-sdk requires C++ code be compiled with -fno-exceptions.
	# libc++abi is currently compiled with exception-handling support disabled.
	# https://github.com/WebAssembly/wasi-sdk/issues/52#issuecomment-530619365
	cmake -S libcxx -B build-libcxx -G Ninja \
		-D CMAKE_BUILD_TYPE=Release \
		-D CMAKE_C_COMPILER_WORKS=ON \
		-D CMAKE_CXX_COMPILER_WORKS=ON \
		-D CMAKE_MODULE_PATH="$SRC/cmake" \
		-D CMAKE_TOOLCHAIN_FILE="$SRC/wasi-toolchain.cmake" \
		-D CMAKE_STAGING_PREFIX=/usr/share/wasi-sysroot \
		-D LIBCXX_ENABLE_EXCEPTIONS:BOOL=OFF \
		-D LIBCXX_ENABLE_SHARED:BOOL=OFF \
		-D LIBCXX_ENABLE_THREADS:BOOL=OFF \
		-D LIBCXX_HAS_PTHREAD_API:BOOL=OFF \
		-D LIBCXX_HAS_EXTERNAL_THREAD_API:BOOL=OFF \
		-D LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY:BOOL=OFF \
		-D LIBCXX_HAS_WIN32_THREAD_API:BOOL=OFF \
		-D LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY:BOOL=OFF \
		-D LIBCXX_ENABLE_FILESYSTEM:BOOL=OFF \
		-D LIBCXX_CXX_ABI=libcxxabi \
		-D LIBCXX_CXX_ABI_INCLUDE_PATHS=libcxxabi/include \
		-D LIBCXX_HAS_MUSL_LIBC:BOOL=ON \
		-D LIBCXX_ABI_VERSION=2 \
		-D WASI_SDK_PREFIX=/usr \
		-D CMAKE_C_FLAGS_RELEASE="-fno-exceptions --sysroot=/usr/share/wasi-sysroot" \
		-D CMAKE_CXX_FLAGS_RELEASE="-fno-exceptions --sysroot=/usr/share/wasi-sysroot" \
		-D LIBCXX_LIBDIR_SUFFIX=/wasm32-wasi

	cmake --build build-libcxx

	cmake -S libcxxabi -B build-libcxxabi -G Ninja \
		-D CMAKE_BUILD_TYPE=Release \
		-D CMAKE_C_COMPILER_WORKS=ON \
		-D CMAKE_CXX_COMPILER_WORKS=ON \
		-D CMAKE_MODULE_PATH="$SRC/cmake" \
		-D CMAKE_TOOLCHAIN_FILE="$SRC/wasi-toolchain.cmake" \
		-D CMAKE_STAGING_PREFIX=/usr/share/wasi-sysroot \
		-D LIBCXXABI_ENABLE_EXCEPTIONS:BOOL=OFF \
		-D LIBCXXABI_ENABLE_SHARED:BOOL=OFF \
		-D LIBCXXABI_ENABLE_THREADS:BOOL=OFF \
		-D LIBCXXABI_HAS_PTHREAD_API:BOOL=OFF \
		-D LIBCXXABI_HAS_EXTERNAL_THREAD_API:BOOL=OFF \
		-D LIBCXXABI_BUILD_EXTERNAL_THREAD_LIBRARY:BOOL=OFF \
		-D LIBCXXABI_HAS_WIN32_THREAD_API:BOOL=OFF \
		-D LIBCXXABI_SILENT_TERMINATE:BOOL=ON \
		-D LIBCXXABI_ENABLE_PIC:BOOL=OFF \
		-D UNIX:BOOL=ON \
		-D CXX_SUPPORTS_CXX11=ON \
		-D LIBCXXABI_LIBCXX_PATH=libcxx \
		-D LIBCXXABI_LIBCXX_INCLUDES="$SRC/build-libcxx/include/c++/v1" \
		-D WASI_SDK_PREFIX=/usr \
		-D CMAKE_C_FLAGS_RELEASE="-fno-exceptions --sysroot=/usr/share/wasi-sysroot" \
		-D CMAKE_CXX_FLAGS_RELEASE="-fno-exceptions --sysroot=/usr/share/wasi-sysroot" \
		-D LIBCXXABI_LIBDIR_SUFFIX=/wasm32-wasi

	cmake --build build-libcxxabi -v

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

	cd $PKG/usr/share/wasi-sysroot/lib/wasm32-wasi
	for f in *.a; do
		/usr/bin/llvm-ranlib $f
		/usr/bin/llvm-strip --strip-debug $f
	done
}