[Linux] make - 3

 이젠 Makefile 을 src 에 두지 않고 아래와 같이 따로 상위 폴더로 분리 해 보자

/* include/my_math.h */
int add(int x, int y);
int subtract(int x, int y);
int multiply(int x, int y);
int divide(int x, int y);

​

/* src/main.c */

#include <stdio.h>
#include <pthread.h>
#include <my_math.h>

void* thread_func(void *data)
{
        printf("[%s]\n", __func__);
        printf("%d\n", add(10, 5));
        printf("%d\n", subtract(10, 5));
        printf("%d\n", multiply(10, 5));
        printf("%d\n", divide(10, 5));

        return 0;
}

int main(void)
{
        pthread_t thread;

        pthread_create(&thread, 0, thread_func, 0);
        pthread_join(thread, 0);

        return 0;
}

/* src/add.c */
#include <my_math.h>

int add(int x, int y)
{
        return x + y;
}

//---------------------------------------------------------------------------------------------

/* src/subtract.c */
#include <my_math.h>

int subtract(int x, int y)
{
        return x - y;
}

//---------------------------------------------------------------------------------------------

/* src/multiply.c */
#include <my_math.h>

int multiply(int x, int y)
{
        return x * y;
}


//---------------------------------------------------------------------------------------------

/* src/divide.c */
#include <my_math.h>
#include <stdio.h>
#include <stdlib.h>

int divide(int x, int y)
{
        if(y == 0) {
                fprintf(stderr, "Can not divide as zero\n");
                exit(1);
        }

        return x / y;
}

# Makefile

SRC_DIR = src
OBJ_DIR = obj
BIN_DIR = bin

EXE = $(BIN_DIR)/exe
SRC = $(wildcard $(SRC_DIR)/*.c)
OBJ = $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)

CC = gcc
CPPFLAGS = -Iinclude -MMD -MP
CFLAGS = -c -Wall
LDFLAGS = -Llib
LDLIBS = -lpthread

.PHONY: all clean

all: $(EXE)

$(EXE): $(OBJ) | $(BIN_DIR)
        $(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
        $(CC) $(CPPFLAGS) $(CFLAGS) $< -o $@

$(BIN_DIR) $(OBJ_DIR):
        @mkdir -p $@

clean:
        @rm -rf $(BIN_DIR) $(OBJ_DIR)
        echo "Clean project"

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

라이브러리도 만들어 추가 해 보자

# src/Makefile

SRC_DIR = src
OBJ_DIR = obj
LIB_DIR = lib
BIN_DIR = bin

EXE = $(BIN_DIR)/exe
SRC = $(wildcard $(SRC_DIR)/*.c)
OBJ = $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
LIB = $(LIB_DIR)/lib$(MY_LIB).a
MY_LIB = my_math

CC = gcc
CPPFLAGS = -Iinclude -MMD -MP
CFLAGS = -c -Wall
LDFLAGS = -Llib
LDLIBS = -lpthread -l$(MY_LIB)

.PHONY: all clean

all: $(LIB) $(EXE)

$(EXE): $(OBJ) | $(BIN_DIR)
        $(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@

$(LIB) : $(OBJ) | $(LIB_DIR)
        ar rcv $@ obj/add.o obj/subtract.o obj/multiply.o obj/divide.o

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
        $(CC) $(CPPFLAGS) $(CFLAGS) $< -o $@

$(BIN_DIR) $(LIB_DIR) $(OBJ_DIR):
        @mkdir -p $@

clean:
        @rm -rf $(BIN_DIR) $(LIB_DIR) $(OBJ_DIR)
        echo "Clean project"

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

make로 빌드 하면 결과는 다음과 같다.