TARGET=libwhiteboard.wasm
TARGETJS=$(TARGET:.wasm=.js)

OBJS=diff.o

CXX=em++

CXXFLAGS=-I./include -O2 -std=c++20
LDFLAGS=-s WASM=1 -s EXPORTED_FUNCTIONS="['_diff_create', '_diff_apply', '_free']"
# Note: Instead of the above explicit EXPORTED_FUNCTIONS, the following causes ~7x wasm file size:
#-s LINKABLE=1 -s EXPORT_ALL=1

default: $(TARGET)

$(OBJS): include

include:
	mkdir include
	cp -r /usr/include/boost include/boost

$(TARGET): $(OBJS)
	$(CXX) $(LDFLAGS) $(OBJS) -o $(TARGETJS)
	cp $(TARGETJS) $(TARGET) ../html/

diff.o: ../diff.cpp
	$(CXX) -c $< $(CXXFLAGS) -o $@
	# run again in case em++ just asked to re-run (on pbuilder/buildd)
	test -e $@ || $(CXX) -c $< $(CXXFLAGS) -o $@

clean:
	-rm -f *.o *.js *.wasm *.html
	-rm -rf include