PREFIX = $(HOME)/opt/hercules-compiler
TMP_DESTDIR = $(CURDIR)/install

all: passes

llvm-clang: build/bin/opt

build/bin/opt: build/build.ninja
	ninja -C build

llvm/tools/clang:
	ln -s ../../clang $@

llvm/projects/openmp:
	ln -s ../../openmp $@

build build_passes:
	mkdir $@

ifneq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))

LLVM_CROSS_FLAGS += -DCMAKE_C_COMPILER=$(DEB_HOST_GNU_TYPE)-gcc
LLVM_CROSS_FLAGS += -DCMAKE_CXX_COMPILER=$(DEB_HOST_GNU_TYPE)-g++
LLVM_CROSS_FLAGS += -DCMAKE_SYSTEM_PROCESSOR=$(DEB_HOST_GNU_CPU)

LLVM_CROSS_FLAGS += -DCMAKE_CROSSCOMPILING=True
## We don't need host tablegens, because we use qemu & binfmt to run
## arm64 binaries on x86
# LLVM_CROSS_FLAGS += -DLLVM_TABLEGEN="<path-to-host-bin>/llvm-tblgen"
# LLVM_CROSS_FLAGS += -DCLANG_TABLEGEN="<path-to-host-bin>/clang-tblgen"
LLVM_CROSS_FLAGS += -DLLVM_DEFAULT_TARGET_TRIPLE=$(DEB_HOST_GNU_TYPE)
LLVM_CROSS_FLAGS += -DLLVM_TARGET_ARCH=$(DEB_TARGET_GNU_CPU)
#LLVM_CROSS_FLAGS += -DLLVM_TARGETS_TO_BUILD=$(shell echo $(DEB_HOST_ARCH)|tr '[:lower:]' '[:upper:]')
endif


build/build.ninja: | build llvm/tools/clang llvm/projects/openmp
	cd $(@D) && cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX="$(PREFIX)" \
		-DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_BACKTRACES=ON -DLLVM_ENABLE_WERROR=OFF \
		-DBUILD_SHARED_LIBS=OFF -DLLVM_ENABLE_RTTI=ON $(LLVM_CROSS_FLAGS) \
		-DCMAKE_CXX_FLAGS='-DHERCULES_PASS_ROOT=\"$(PREFIX)/lib/hercules\"' \
		-G "Ninja" $(CURDIR)/llvm

$(TMP_DESTDIR)/$(PREFIX)/lib/cmake/llvm: | llvm-clang
	DESTDIR=$(TMP_DESTDIR) ninja -C build install

build_passes/build.ninja: | build_passes $(TMP_DESTDIR)/$(PREFIX)/lib/cmake/llvm
	cd $(@D) && cmake -DCMAKE_INSTALL_PREFIX="$(PREFIX)" \
		-DLLVM_DIR':'STRING=$(TMP_DESTDIR)$(PREFIX)/lib/cmake/llvm -DCMAKE_BUILD_TYPE=DEBUG \
		-DLLVM_TARGETS_TO_BUILD="X86;ARM" -G "Ninja" $(CURDIR)/HerculesCompiler/llvm-passes

passes: build_passes/build.ninja
	ninja -C build_passes

install: all
	DESTDIR=$(DESTDIR) ninja -C build install
	DESTDIR=$(DESTDIR) ninja -C build_passes install

clean:
	rm -rf build build_passes

define tar_concat
$(foreach subarch,$(shell git submodule --quiet foreach 'echo $$toplevel/../$(prefix)-$$path.tar'),tar --concatenate --file=../$(prefix).tar $(subarch)
)
endef

create-orig-tgz: prefix=$(notdir $(CURDIR))
create-orig-tgz:
	git archive --format=tar --prefix=$(prefix)/ -o ../$(prefix).tar HEAD
	git submodule foreach 'git archive --format=tar --prefix=$(prefix)/$$path/ -o $$toplevel/../$(prefix)-$$path.tar HEAD'
	$(tar_concat)
	gzip -c ../$(prefix).tar > "../$(prefix)_$(shell dpkg-parsechangelog --show-field Version|sed -e s/-.*//).orig.tar.gz"