一步一步写一个简单通用的makefile(二)-白红宇

一步一步写一个简单通用的makefile(二)

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发布时间：2019-06-28

本文共 4287 字，大约阅读时间需要 14 分钟。

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
     
      void myPrintHelloMake(void) {  printf("Hello makefiles!\n");  return;}

hellofunc.c代码：

#include"../include/hellofunc.h"#include
     
      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， 2014-10-19# 指令编译器和选项  CC=gcc  CFLAGS=-Wall LIBS=-lmIncludeDir = -I./hellofunc/LinkDir = -LOBJ_DIR = ./objBIN_DIR = ./binPROJECT_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=$(BIN_DIR)/hellomakesrc=$(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 : cleanclean:      -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.c4 directories, 7 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
     
      #include
      
       #include
       
        int main() {  // call a function in another file  myPrintHelloMake();    double value =15;     printf("Value:%f\n",log(value));   return(0);}

hellofunc.c:

//#include"../include/hellofunc.h"#include
     
      #include
      
       void myPrintHelloMake(void) {  printf("Hello makefiles!\n");  return;}

makefile:

#Hellomake#Magnum， 2014-10-19# 指令编译器和选项  CC=gcc  CFLAGS=-Wall LIBS=-lmIncludeDir = -I./include/LinkDir = -LOBJ_DIR = ./objBIN_DIR = ./binPROJECT_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=$(BIN_DIR)/hellomakesrc=$(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 : cleanclean:      -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)