C++ 和 Makefile 笔记

#include <stdio.h>

int main(void) {
	printf("Hello, world!\n");
	return 0;
}

g++ -g -Wall hello.cpp -o hello

void hello(const char* name);

#include <stdio.h>
#include "hello.h"

void hello(const char* name) {
	printf("Hello, %s!\n", name);
}

#include "hello.h"

int main(void) {
	hello("Gintama");
	return 0;
}

g++ -Wall hello.cpp hello_fn.cpp -o hello2

#include <math.h>
#include <stdio.h>

int main(void) {
	double x = 1.0;
	double y = cos(x);
	printf("Cos(1.0) is: %f\n", y);

	return 0;
}

g++ -Wall extlib.cpp /usr/lib/libm.a -o extlib

g++ -Wall extlib.c -lm -o extlib

target1 ... : prerequisites ...
    command

target2 ... : prerequisites ...
    command

CC=g++
CFLAGS=-Wall

hello:hello.o hello_fn.o

clean:
	rm -f hello hello.o hello_fn.o

CC      = g++ 
OBJ     = main_fn.o main.o 

CFLAGS  = -I include  

vpath   %.cpp src
vpath   %.h include

main:$(OBJ) 
	$(CC) -o $@ $(OBJ) 

%.o:%.cpp
	$(CC) $(CFLAGS) -c $<

.PHONY:clean  
clean:  
	-rm -f main $(OBJ)

#ifndef __MAIN_H  
#define __MAIN_H  

extern void echo(void);  
#endif 

#include <iostream>
#include "main.h"

void echo(void)
{
		  std::cout << "echo ..." << std::endl;
}

#include <iostream>
#include "main.h"

int main() {
	std::cout<< "helloworld" << std::endl;
	echo();
	return 0;
}