一步一步写一个简单通用的makefile(二)

时间：2023-03-09 23:57:01
一步一步写一个简单通用的makefile(二)

这一篇源代码沿用上一篇的源代码hellomake.c hellofunc.c hellofunc.h makefile

但是代码内容和结构有变化，如下：

.

├── include

│   └── hellofunc.h

├── makefile

└── src

    ├── hellofunc.c

    └── hellomake.c

hellomake.c 代码：

#include"../include/hellofunc.h"

#include<stdio.h>

void myPrintHelloMake(void) {

  printf("Hello makefiles!\n");

  return;

}

hellofunc.c代码：

#include"../include/hellofunc.h"

#include<stdio.h>

void myPrintHelloMake(void) {

  printf("Hello makefiles!\n");

  return;

}

hellofunc.h代码：

/*

example include file

*/

void myPrintHelloMake(void);

makefile 文件代码：

#Hellomake

#Magnum， --

# 指令编译器和选项

CC=gcc

CFLAGS=-Wall

LIBS=-lm

IncludeDir = -I./hellofunc/

LinkDir = -L

OBJ_DIR = ./obj

BIN_DIR = ./bin

PROJECT_TOP_DIR=.#$(shell pwd)  #$(shell cd ../; pwd)

PROJECT_BIN_DIR=./bin

PROJECT_SRC_DIR=./src

PROJECT_LIB_DIR=./lib

PROJECT_OBJ_DIR=./objs

MKDIR := mkdir -p  

# 目标文件

TARGET=$(BIN_DIR)/hellomake

src=$(wildcard ./src/*.c)

dir= $(notdir $(src))

PROJECT_OBJ= $(patsubst %.c,%.o,$(dir) )

PROJECT_ALL_OBJS= $(addprefix ./objs/, $(PROJECT_OBJ))

$(TARGET): $(PROJECT_ALL_OBJS)

    $(CC) -o $@ $^ $(LIBS)    

.PHONY : clean

clean:

    -rm -rf $(TARGET) $(PROJECT_ALL_OBJS)

./objs/%.o:./src/%.c

    @if test ! -d $(PROJECT_OBJ_DIR) ; \

        then \

        mkdir $(PROJECT_OBJ_DIR) ; \

    fi

    @if test ! -d $(PROJECT_BIN_DIR) ; \

        then \

        mkdir $(PROJECT_BIN_DIR) ; \

    fi

    $(CC) $(CFLAGS) -o $@ -c $<

makefile执行命令的部分记得改为tab而不是空格，否则会报错。

执行make,结果如下：

.

├── bin

│   └── hellomake

├── include

│   └── hellofunc.h

├── makefile

├── objs

│   ├── hellofunc.o

│   └── hellomake.o

└── src

    ├── hellofunc.c

    └── hellomake.c

 directories,  files

这里面课执行文件放在拉bin文件夹中，而中间.o文件全部放在objs文件夹内。

执行命令"./bin/hellomake"得到：

Hello makefiles!

Value:2.708050

可以发现hellomake.c 和 hellofunc.c 在引入头文件的地方有变化，其他内容还是和之前的一样。

也可以这样修改：

hellomake.c:

//#include "../include/hellofunc.h"

#include<hellofunc.h>

#include<stdio.h>

#include<math.h>

int main() {

  // call a function in another file

  myPrintHelloMake();

    double value =;

    printf("Value:%f\n",log(value));

  return();

}

hellofunc.c:

//#include"../include/hellofunc.h"

#include<hellofunc.h>

#include<stdio.h>

void myPrintHelloMake(void) {

  printf("Hello makefiles!\n");

  return;

}

makefile:

#Hellomake

#Magnum， --

# 指令编译器和选项

CC=gcc

CFLAGS=-Wall

LIBS=-lm

IncludeDir = -I./include/

LinkDir = -L

OBJ_DIR = ./obj

BIN_DIR = ./bin

PROJECT_TOP_DIR=.#$(shell pwd)  #$(shell cd ../; pwd)

PROJECT_BIN_DIR=./bin

PROJECT_SRC_DIR=./src

PROJECT_LIB_DIR=./lib

PROJECT_OBJ_DIR=./objs

MKDIR := mkdir -p  

# 目标文件

TARGET=$(BIN_DIR)/hellomake

src=$(wildcard ./src/*.c)

dir= $(notdir $(src))

PROJECT_OBJ= $(patsubst %.c,%.o,$(dir) )

PROJECT_ALL_OBJS= $(addprefix ./objs/, $(PROJECT_OBJ))

$(TARGET): $(PROJECT_ALL_OBJS)

    $(CC) -o $@ $^ $(LIBS) 

.PHONY : clean

clean:

    -rm -rf $(TARGET) $(PROJECT_ALL_OBJS)

./objs/%.o:./src/%.c

    @if test ! -d $(PROJECT_OBJ_DIR) ; \

        then \

        mkdir $(PROJECT_OBJ_DIR) ; \

    fi

    @if test ! -d $(PROJECT_BIN_DIR) ; \

        then \

        mkdir $(PROJECT_BIN_DIR) ; \

    fi

    $(CC) $(CFLAGS) -o $@ -c $< $(IncludeDir)

进一步优化makefile:



#Hellomake
#Magnum， 2014-10-19
# 指令编译器和选项
CC=gcc
CFLAGS=-Wall 
LIBS=-lm
IncludeDir = -I./include/
LinkDir = -L
OBJ_DIR = ./obj
BIN_DIR = ./bin
PROJECT_TOP_DIR=$(shell pwd)#$(shell cd ../; pwd)
PROJECT_BIN_DIR=./bin
PROJECT_SRC_DIR=./src
PROJECT_LIB_DIR=./lib
PROJECT_OBJ_DIR=./objs
MKDIR := mkdir -p




# 目标文件
TARGET=$(BIN_DIR)/hellomake




src=$(wildcard $(PROJECT_SRC_DIR)/*.c)
dir= $(notdir $(src))
PROJECT_OBJ= $(patsubst %.c,%.o,$(dir) )
PROJECT_ALL_OBJS= $(addprefix $(PROJECT_OBJ_DIR)/, $(PROJECT_OBJ))




all: chdir $(TARGET)




$(TARGET): $(PROJECT_ALL_OBJS)
	$(CC) -o $@ $^ $(LIBS)




chdir:
	@if test ! -d $(PROJECT_OBJ_DIR) ; \
		then \
		mkdir $(PROJECT_OBJ_DIR) ; \
	fi




@if test ! -d $(PROJECT_BIN_DIR) ; \
		then \
		mkdir $(PROJECT_BIN_DIR) ; \
	fi




.PHONY : clean
clean:
	-rm -rf $(TARGET) $(PROJECT_ALL_OBJS)




./objs/%.o:./src/%.c
	$(CC) $(CFLAGS) -o $@ -c $< $(IncludeDir)


 




执行make也能得到正确的结果， "-I"指定啦编译的时候系统搜索头文件的系统路径首先是"-I"后面的路径，然后才是/usr/include 之类的。


提示： makefile文件结束后请删除不必要的空格，很可能你google 超久最后就是由于这些多余的空格引起的。


关于下面这部分代码不懂的，可以百度，网上有很多详细的解释：


src=$(wildcard ./src/*.c) 
dir= $(notdir $(src))  
PROJECT_OBJ= $(patsubst %.c,%.o,$(dir) )  
PROJECT_ALL_OBJS= $(addprefix ./objs/, $(PROJECT_OBJ))
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