Makefile

# Compiler and Tools
CXX = /opt/homebrew/opt/llvm/bin/clang++
EMCC = emcc

# Flags
CXXFLAGS = -std=c++20 -Wall -Wextra -pedantic -O3 -march=native
CXXFLAGS += -isysroot $(shell xcrun --show-sdk-path)
# for omp thread debugging
#CXXFLAGS += -g -fsanitize=address -fopenmp -I/opt/homebrew/opt/llvm/include
CXXFLAGS += -fopenmp -I/opt/homebrew/opt/llvm/include
DEPFLAGS = -MMD -MF $(@:.o=.d)

LDFLAGS = -fopenmp -L/opt/homebrew/opt/llvm/lib -lz -lc++

# Emscripten Flags for WASM
EMCCFLAGS = -O3 -s WASM=1 -s EXPORTED_FUNCTIONS="['_rainbowHash64', '_rainbowHash128', '_rainbowHash256', 'stringToUTF8', 'lengthBytesUTF8', '_malloc', '_free']" \
            -s EXPORTED_RUNTIME_METHODS="['wasmExports', 'ccall', 'cwrap']" \
            -s WASM_BIGINT=1 -s ALLOW_MEMORY_GROWTH=1 -g 

# Directories
OBJDIR = rain/obj
BUILDDIR = rain/bin
WASMDIR = js/wasm

# Sources and Outputs
SRCS = $(wildcard src/*.cpp)
OBJS = $(addprefix $(OBJDIR)/,$(notdir $(SRCS:.cpp=.o)))
DEPS = $(OBJS:.o=.d)

STORM_WASM_SOURCE = src/rainstorm.cpp
BOW_WASM_SOURCE = src/rainbow.cpp
WASM_OUTPUT = docs/rain.wasm
JS_OUTPUT = docs/rain.cjs

# Default Target
all: directories node_modules rainsum link rainwasm

# Create Necessary Directories
directories: ${OBJDIR} ${BUILDDIR} ${WASMDIR}

${OBJDIR}:
	mkdir -p ${OBJDIR}

${BUILDDIR}:
	mkdir -p ${BUILDDIR}

${WASMDIR}:
	mkdir -p ${WASMDIR}

# Install Node Modules
node_modules:
	@(test ! -d ./js/node_modules && cd js && npm i && cd ..) || :
	@(test ! -d ./scripts/node_modules && cd scripts && npm i && cd ..) || :

# Build Executable
rainsum: $(OBJS)
	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $(BUILDDIR)/$@ $^

# Compile Object Files
$(OBJDIR)/%.o: src/%.cpp
	$(CXX) $(CXXFLAGS) $(DEPFLAGS) -c $< -o $@

# Build WebAssembly Output
rainwasm: $(WASM_OUTPUT) $(JS_OUTPUT)

$(WASM_OUTPUT) $(JS_OUTPUT): $(STORM_WASM_SOURCE) $(BOW_WASM_SOURCE)
	@[ -d docs ] || mkdir -p docs
	@[ -d ${WASMDIR} ] || mkdir -p ${WASMDIR}
	$(EMCC) $(EMCCFLAGS) -o docs/rain.html $(STORM_WASM_SOURCE) $(BOW_WASM_SOURCE)
	mv docs/rain.js $(JS_OUTPUT)
	cp $(WASM_OUTPUT) $(JS_OUTPUT) ${WASMDIR}
	rm docs/rain.html

# Symlink for Convenience
link:
	@ln -sf rain/bin/rainsum

# Installation
.PHONY: install
install: rainsum
	cp $(BUILDDIR)/rainsum /usr/local/bin/

# Include Dependencies
-include $(DEPS)

# Clean Build Artifacts
.PHONY: clean
clean:
	rm -rf $(OBJDIR) $(BUILDDIR) rainsum $(WASMDIR) js/node_modules scripts/node_modules $(WASM_OUTPUT) $(JS_OUTPUT)