.DEFAULT_GOAL = build/main.out
CXX = clang++
CXXFLAGS += -std=c++26 -Wno-experimental-header-units -Wno-unused-command-line-argument
LDFLAGS += -std=c++26
SYSTEMHEADER_FLAGS = -Wno-deprecated-builtins -Wno-pragma-system-header-outside-header -Wno-keyword-compat
module_pair = $(if $(findstring user,$1),$(patsubst build/user/%.pcm,%=,$1))$1
build_module_path = $(if $1,$(let first rest,$1,$(if $(rest),-fmodule-file=$(call module_pair,$(first)) $(call build_module_path,$(rest)),-fmodule-file=$(call module_pair,$(first)))))
object_build = $(filter-out %.pcm,$^) $(call build_module_path,$(filter %.pcm,$^))
autodir = @mkdir -p $(@D)

build/main.out: build/main.o build/builder.o
	$(call autodir)
	$(CXX) $(LDFLAGS) $^ -o $@

build/main.o:: main.cxx build/system/print.pcm build/user/builder.pcm
build/builder.o:: builder.cxxm build/system/type_traits.pcm
build/user/builder.pcm:: build/system/type_traits.pcm

build/%.o::
	$(call autodir)
	$(CXX) $(CXXFLAGS) -c $(call object_build)
	@mv $(patsubst build/%,%,$@) $@

build/user/%.pcm:: %.cxxm
	$(call autodir)
	$(CXX) $(CXXFLAGS) --precompile -o $@ $(call object_build)

build/system/%.pcm:
	$(call autodir)
	$(CXX) $(CXXFLAGS) -xc++-system-header --precompile $(patsubst build/system/%.pcm,%,$@) -o $@ $(SYSTEMHEADER_FLAGS)

.PHONY: clean run bear
clean:
	@-rm -rf ./build
bear: clean
	bear --append -- $(MAKE)

run: $(.DEFAULT_GOAL)
	@./$(.DEFAULT_GOAL)