简单版makefile

compute.c

#include <math.h>

double compute(double x, double y) {
        return pow(x, y);
}

makefile

powe: power.o compute.o
        gcc power.o compute.o   -lm -o powe

power.o: power.c
        gcc -c power.c

compute.o: compute.c
        gcc -c compute.c

power.c

#include <stdio.h>

double compute(double x, double y);

int main() {
        float x, y;
        printf("The program takes x and y from stdin and displays x^y.\n");
        printf("Enter integer x: ");
        scanf("%f", &x);
        printf("Enter integer y: ");
        scanf("%f", &y);
        printf("x^y is: %6.0f\n", compute(x, y));
        return 0;
}

然后执行make.
执行过程:

5:43 david@debian /home/david
% make
gcc -c power.c
gcc -c compute.c
gcc power.o compute.o -lm -o powe

注意：makefile里面的 -lm 是compute.c用到了/usr/lib/libm.so的缘故.

Make rules
target-list: dependency-list
<Tab>command-list