ifdef RELEASE
	RUST_BUILD_TYPE := release
	RUST_EXTRA_FLAGS := --release
	C_OTHER_FLAGS := -DNDEBUG -O2
else
	RUST_BUILD_TYPE := debug
	RUST_EXTRA_FLAGS :=
	C_OTHER_FLAGS := -Og
endif

CC := source ${HOME}/git/emsdk/emsdk_env.sh && emcc
CFLAGS := \
		-Irust_src/include \
		-sEXPORTED_FUNCTIONS=_main \
		-sSTACK_SIZE=2097152 \
		${C_OTHER_FLAGS}
# Check https://emscripten.org/docs/tools_reference/emcc.html for more compiler
# flags to pass to emcc.

HEADERS := \
		rust_src/include/rust_src.h

all: dist

rust_src/target/wasm32-unknown-emscripten/${RUST_BUILD_TYPE}/libems_rust_template.a:
	cd rust_src && cargo build --target=wasm32-unknown-emscripten ${RUST_EXTRA_FLAGS}

dist: rust_src/target/wasm32-unknown-emscripten/${RUST_BUILD_TYPE}/libems_rust_template.a src/main.c.o
	@mkdir dist
	${CC} -o dist/my_project.html ${CFLAGS} $^
	ln -s my_project.html dist/index.html

.PHONY: clean

clean:
	cd rust_src && cargo clean
	rm -f src/*.c.o
	rm -rf dist

%.c.o: %.c ${HEADERS}
	${CC} -o $@ -c ${CFLAGS} $<