Build llvm with C++20 modules + mlir with the vulkan runner

Makefile

ROOT_DIR = $(PWD)
THIRD_PARTY_DIR = $(ROOT_DIR)/third_party
INSTALL_DIR = $(ROOT_DIR)/install

# TODO: this be in its own git repository

llvm-configure:
	cmake -S $(ROOT_DIR)/../llvm-project/llvm \
		-B $(ROOT_DIR)/build/llvm \
		-G Ninja \
		-DCMAKE_BUILD_TYPE=MinSizeRel \
		-DCMAKE_INSTALL_PREFIX=$(INSTALL_DIR) \
		-DLLVM_CCACHE_BUILD=ON \
		-DLLVM_ENABLE_PROJECTS="clang;lld;lldb;clang-tools-extra;mlir;polly;bolt;libclc" \
		-DLLVM_ENABLE_RUNTIMES="compiler-rt;libc;libcxx;libcxxabi;libunwind" \
		-DLLVM_RUNTIME_TARGETS="x86_64-unknown-linux-gnu" \
		-DMLIR_ENABLE_VULKAN_RUNNER=ON \
		-DCOMPILER_RT_BUILD_SANITIZERS=ON \
		-DCOMPILER_RT_BUILD_XRAY=ON \
		-DCOMPILER_RT_BUILD_LIBFUZZER=ON \
		-DCOMPILER_RT_BUILD_PROFILE=ON \
		-DCOMPILER_RT_BUILD_MEMPROF=ON \
		-DCOMPILER_RT_BAREMETAL_BUILD=ON \
		-DLIBCXX_ENABLE_STD_MODULES=ON \
		-DLIBCXXABI_ENABLE_SHARED=OFF \
    -DLIBCXXABI_ENABLE_STATIC=ON \
		-DLIBCXXABI_HAS_PTHREAD_API=ON \
		-DLIBCXX_CXX_ABI=libcxxabi \
		-DLIBCXX_ENABLE_SHARED=OFF \
		-DLIBCXX_ENABLE_STATIC=ON \
		-DLIBCXX_HAS_PTHREAD_API=ON \
		-DLIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB=ON \
    -DLIBCXX_ENABLE_FILESYSTEM=ON \
    -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=ON

llvm-build: llvm-configure
	cmake --build $(ROOT_DIR)/build/llvm

llvm-install: llvm-build
	cmake --build $(ROOT_DIR)/build/llvm --target install/strip
	# For some reason this doesn't install runtimes, so we do it manually
	cp -r $(ROOT_DIR)/build/llvm/lib/x86_64-unknown-linux-gnu $(INSTALL_DIR)/lib/
	cp -r $(ROOT_DIR)/build/llvm/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libc/lib/libllvmlibc.a $(INSTALL_DIR)/lib/x86_64-unknown-linux-gnu/