Several simple examples of makefile

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I. Only one. c file is written in makefile.

 

 

Main. c

 

#include <stdio.h>int main(void){    printf("Makefile\n");    return 0;}

 

Makefile

CFLAGS=-WallCC=gccmain:main.o$(CC) $(CFLAGS) main.o -o mainmain.o:main.c$(CC) $(CFLAGS) -c main.c -o main.oclean:$(RM) main.o$(RM) main.PHONY:clean

 

 

The second method of makefile:

CFLAGS=-WallCC=gccmain:main.oclean:$(RM) main.o$(RM) main.PHONY:clean

 

 

 

 

Ii. makefile writing when there are two. c files

 

Main. c

#include <stdio.h>extern void fun1(void);extern void fun2(void);int main(void){    printf("main\n");    fun1();     fun2();    return 0;}

Fun 1.c

#include <stdio.h>void fun1(void){    printf("fun1\n");}fun2.c#include <stdio.h>void fun2(void){    printf("fun2\n");}

 

Makefile

CFLAGS=-WallCC=gccmain:main.o fun1.o cs2/fun2.oclean:$(RM) *.o$(RM) cs2/*.o$(RM) main.PHONY:clean

 

 

Another way to write makefile:

CFLAGS=-WallCC=gccmain:main.o fun1.o cs2/fun2.o$(CC) $(CFLAGS) $^ -o $@main.o:main.c$(CC) $(CFLAGS) -c $^ -o $@fun1.o:fun1.c$(CC) $(CFLAGS) -c $^ -o $@cs2/fun2.o:cs2/fun2.c$(CC) $(CFLAGS) -c $^ -o $@clean:$(RM) *.o$(RM) cs2/*.o$(RM) main.PHONY:clean

 

3. Writing nested makefile

The makefile in the makefiletest directory is the master makefile, which reads the master makefile using the make command, and then the master makefile reads the makefile in the subdirectories in turn.

Master makefile:

CC=gccCFLAGS=-Wall -g SUBDIR=d1 \   d2 \   d3 \   d4 \   main \   objOBJS=d1.o d2.o d3.o d4.o main.oBIN=myappOBJDIR=objBINDIR=binexport CFLAGS CC SUBDIR OBJS OBJDIR BIN BINDIRall:checkdir $(SUBDIR) checkdir:mkdir -p $(BINDIR)

// Note: $ (subdir) should be followed by a dependent file. Otherwise, make-C $ @ cannot be executed, or declare all directory names as pseudo targets.

$ (Subdir): huixianmake-C $ # Yes $ @, instead of $ (subdir) Huixian: @ echo $ (subdir) @ echo begin! Clean: @ $ (RM) $ (objdir )/*. o @ rM-RF $ (bindir ). phony: Clean note: the comments of makefile must start with # and must be written at the top.

 

Main/Main. c

#include "../d4/d4.h" extern void fun2(void);extern void fun3(void);extern void fun1(void);int main(void){    fun1();    fun2();    fun3();fun4();    return 0;}

 

Main/makefile

../$(OBJDIR)/main.o:main.c$(CC) -c $(CFLAGS) $< -o $@

 

Include/myinclude. h

#ifndef __MYINCLUDE_H__#define __MYINCLUDE_H__#include <stdio.h>#endif

 

D1/d1.c

#include "../include/myinclude.h"void fun1(void){    printf("fun1\n");    return ;}

D1/makefile

../$(OBJDIR)/d1.o:d1.c$(CC) $(CFLAGS) -c $< -o $@

 

D2/d2.c

#include "../include/myinclude.h"void fun2(void){    printf("%s\n","this is fun2");}

D2/makefile

../$(OBJDIR)/d2.o:d2.c$(CC) $(CFLAGS) -c $^ -o $@

D3/D3.c

#include "../include/myinclude.h"void fun3(void){    printf("%s\n","this is fun3");}

D3/makefile

../$(OBJDIR)/d3.o:d3.c$(CC) $(CFLAGS) -c $^ -o $@

D4/d4.h

#ifndef __D4_H__#define __D4_H__#define N 4extern void fun4(void);#endif

D4/d4.c

#include "../include/myinclude.h"#include "d4.h"void fun4(void){printf("this is fun4-->%d\n",N);}

D4/makefile

../$(OBJDIR)/d4.o:d4.c$(CC) $(CFLAGS) -c $< -o $@

Make

Enter bin/run MyApp

Directory changes after make

 

Directory changes after make clean