CC ?= gcc
DEBUG ?= 0

CFLAGS = -Wall -Werror -Wextra -Wpedantic -std=c99 -Ofast \
-D_POSIX_C_SOURCE=200809L

ifeq ($(DEBUG), 1)
	CFLAGS += -g -DDEBUG
endif

SRCDIR = ./src
INCDIR = ./include
OBJDIR = ./obj
BINDIR = ./bin

SRC = $(wildcard $(SRCDIR)/*.c)
OBJ = $(SRC:$(SRCDIR)/%.c=$(OBJDIR)/%.o)
DEP = $(OBJ:.o=.d)

PROGNAME_BASE = polonium
PROGNAME_SUFFIX_DEBUG = debug

EXECUTABLE = $(PROGNAME_BASE)
ifeq ($(DEBUG), 1)
	EXECUTABLE := $(EXECUTABLE)_$(PROGNAME_SUFFIX_DEBUG)
endif

EXECPATH = $(BINDIR)/$(EXECUTABLE)

all: $(EXECPATH)

$(EXECPATH): $(OBJ)
	@mkdir -p $(@D)
	$(CC) $(CFLAGS) $^ -o $@
ifeq ($(DEBUG), 0)
	strip $@*
endif

-include $(DEP)

$(OBJDIR)/%.o: $(SRCDIR)/%.c
	@mkdir -p $(@D)
	$(CC) $(CFLAGS) -I$(INCDIR) -MMD -MP -c $< -o $@

define rmfiles_if_exist
	@for file in $1; do \
		if [ -e $$file ]; then \
			echo "Removing file $$file"; \
			rm $$file; \
		fi; \
	done
endef

define rmdirs_if_empty
	@for dir in $1; do \
		if [ -d "$$dir" ]; then \
			if [ -z "$$(find "$$dir" -mindepth 1 -maxdepth 1 -print -quit)" ]; \
			then \
				echo "Removing empty directory $$dir"; \
				rm -r $$dir; \
			fi; \
		fi; \
	done
endef

clean:
	$(call rmfiles_if_exist,$(EXECPATH) $(DEP) $(OBJ))
	$(call rmdirs_if_empty,$(BINDIR) $(OBJDIR))

.PHONY: all clean