CC ?= gcc
CFLAGS = -fPIC -Wall -Wextra -O2 -c
LDFLAGS = -shared
BUILD_DIR ?= $(shell pwd)/build
TARGET_DIR ?= $(shell pwd)/target

ifdef ALOG_HIJACK_PRINTF
CFLAGS += -DALOG_HIJACK_PRINTF
endif

ifdef ALOG_DEBUG
CFLAGS += -g
endif

OBJ = $(BUILD_DIR)/alog.o
LIB = $(TARGET_DIR)/alog.so

.PHONY: so
so: $(if $(shell stat $(LIB)), clean) $(LIB)

$(LIB): $(TARGET_DIR) $(OBJ)
	$(CC) $(LDFLAGS) -o $(LIB) $(OBJ)

$(OBJ): $(BUILD_DIR)
	$(CC) $(CFLAGS) alog.c -o $(OBJ)

$(BUILD_DIR):
	mkdir $(BUILD_DIR)

$(TARGET_DIR):
	mkdir $(TARGET_DIR)

.PHONY: clean
clean:
	rm $(LIB) $(OBJ)