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BINARY ?= obj/lprotoc
CXXFLAGS += -Isrc -I. $(shell pkg-config --cflags protobuf)
LDFLAGS  += $(shell pkg-config --libs protobuf)

# Echo function
<< := @echo
ifneq ($(shell eval 'echo -e'),-e)
	<< += -e
endif


<<sources>> := src/system.l src/system.proto src/system.yy
<<objects>> := obj/system.lex.o obj/system.tab.o obj/system.pb.o

all: $(BINARY)

%.lex.cc: %.l
	$(<<) "  LEX\t" $(<:src/%=%)
	@flex -+ -o $(@) $(<)

%.tab.cc: %.yy
	$(<<) "BISON\t" $(<:src/%=%) $(@:src/%=%)
	@bison -o $(@) $(<)

%.tab.hh: %.yy
	$(<<) "BISON\t" $(<:src/%=%) $(@:src/%=%)
	@bison -o /dev/null --header=$(@) $(<)

%.pb.cc %.pb.h: %.proto
	$(<<) "PROTOC" $(<)
	@protoc --cpp_out=. $(<)

src/system.lex.cc: src/system.tab.hh src/system.tab.cc
src/system.tab.cc: src/system.pb.h

obj/%.o: src/%.cc
	$(<<) "  CXX\t" $(<:src/%=%)
	@mkdir -p $(shell dirname $(@))
	@$(CXX) -c $(<) -o $(@) $(CXXFLAGS)


$(BINARY): $(<<objects>>)
	$(<<) "LINK\t" $(^:obj/%=%)
	@$(CXX) $(^) -o $(@) $(LDFLAGS)

clean:
	$(<<) "  RM\t" $(<<objects>>:obj/%=%) $(BINARY)
	@$(RM) -f $(<<objects>>) $(BINARY)

.PHONY: all clean install uninstall test
.INTERMEDIATE: src/system.lex.cc src/system.pb.h src/system.tab.cc src/system.tab.hh