# Detect OS

ifeq ($(OS),Windows_NT)
	ISWIN := 1
endif

ifdef ISWIN
	CC := i686-w64-mingw32-gcc
else
	CC := gcc
endif

RM ?= rm -f
RMDIR ?= rm -rf
MKDIR ?= mkdir -p

WARFLAGS := -Wall #-Wextra -pedantic

CFLAGS_g := $(WARFLAGS) -std=gnu11 -O2 -msse2 -ffast-math -mfpmath=sse -DNDEBUG \
	-MMD

LDFLAGS_g := -s

# object output dir
OBJDIR_g := obj_g

SRCS := $(wildcard *.c)
OBJS_g := $(SRCS:.c=.o)

# include dirs
CFLAGS_g +=

# libs
ifdef ISWIN
	LDFLAGS_g += 
else
	CFLAGS_g +=
	LDFLAGS_g += 
endif

# binary target
ifdef ISWIN
	TARG_g := clox.exe
else
	TARG_g := clox
endif

game: $(TARG_g)
	@echo "*** Target '$@': '$^' is up to date!"

default: game

.PHONY: default game clean

# rewrite OBJS so it outputs object files to seperate dir

OBJS_g := $(patsubst %,$(OBJDIR_g)/%,$(OBJS_g))

# include the dependency rules generated by -MMD

-include $(OBJS_g:.o=.d)

clean:
	@echo "*** Removing target binary and object directory..."
	@$(RM) $(TARG_g)
	@$(RMDIR) $(OBJDIR_g)
	@echo "*** Done."

# Compile

$(OBJDIR_g)/%.o: %.c
	@$(MKDIR) $(@D)
	@echo "*** Compiling '$<' ..."
	@$(CC) $(CFLAGS_g) -c $< -o $@

# Link

$(TARG_g): $(OBJS_g)
	@$(MKDIR) $(@D)
	@echo "\n*** Linking binary target '$@' ...\n"
	@$(CC) $(OBJS_g) -o $@ $(LDFLAGS_g)