CC = clang
RELEASE ?= 0 # Optimize.
DEBUG 	?= 1 # Emit debug info.
SQUEEZE ?= 0 # Nuclear option to save space.
BITS 	?= 64
CFLAGS = -Wall -std=gnu99 -flto=thin -ffast-math -fno-ident -fvisibility=hidden
ifeq ($(MAKECMDGOALS),linux)
	ifeq ($(RELEASE), 1)
	    CFLAGS += -Wl,--ignore-data-address-equality -Wl,--ignore-function-address-equality \
	    		  -Wl,--optimize-bb-jumps
	endif
	ifeq ($(SQUEEZE), 1)
	    CFLAGS += -Wl,-T,tiny.ld -Wl,--icf=all -Wl,--bp-compression-sort=both \
	    		  -Wl,--nmagic
	endif
	ifeq ($(BITS), 64)
		CFLAGS += -m64 -march=x86-64-v3 -mpopcnt
	else
		CFLAGS += -m32 -msse2
	endif
endif
ifeq ($(MAKECMDGOALS),wasm)
	ifeq ($(RELEASE), 1)
	    CFLAGS += -Wl,--compress-relocations
	endif
endif
ifeq ($(DEBUG), 1)
    CFLAGS += -g3
else
    CFLAGS += -DNDEBUG -Wl,--strip-all
endif
ifeq ($(RELEASE), 1)
    CFLAGS += -O1 -fuse-ld=lld -fmerge-all-constants -Wl,-O3 \
    		  -ffunction-sections -fdata-sections -Wl,--gc-sections \
    		  -Wl,-mllvm,--vectorize-slp=true \
    		  -Wl,-mllvm,--enable-gvn-hoist=true
endif
# TODO: Just use amalgam build for all?
DEPS = ../Common/lzw.h ../Common/mat.h ../Common/vec.h ../Common/fix.h ../Common/def.h ../Common/bits.h \
	   ../Common/gem.h \
	   ../Common/Timer/time.h \
	    ./Display/display.h \
	    ./draw.h
SRC = ../Common/lzw.c ../Common/fix.c ../Common/mat.c ./draw.c
LINUX = ./amalgam.c
WASM = ./amalgam.c
DOS = maindos.c Display/dos.c

%.o: %.c $(DEPS)
	$(CC) -c -o $@ $< $(CFLAGS)

# TODO: Make it work with no stdlib.
linux: CFLAGS += -static -mbmi2 -nostdlib
linux: $(LINUX) | $(SRC)
	$(CC) -o player $^ $(CFLAGS)

# Note: lld package might need to be downloaded.
wasm: CFLAGS += --target=wasm32 -nostdlib -Wl,--no-entry -msimd128 -mbulk-memory
wasm:
	$(CC) -o player.wasm $(WASM) $(CFLAGS)

# TODO: Use https://github.com/amindlost/pmodew
dos: $(DOS) $(DEPS)
	wcl386 -bt=dos4g -ox -l=dos4g $(DOS)

clean:
	rm -r *.o ../*.o