Is it a header file or library? in a makefile
- by gccinac
I already know the differences between a header file and a library. However, when I'm writing my makefile, I have some difficulties on deciding if I should put something as a dependency of the file or just at the linking rule.
For example: I have 2 simple files:
main.c:
#include <stdio.h>
main(){
printf("this is the sine or 90");
sinus(90);
}
and func.c:
#include <math.h>
sinus(int num){
return sin(num);
}
and my makefile is:
main: main.o func.o
gcc main.o func.o -lm -o main
func.o: func.c
main.o: main.c
Well, my question is why this makefile works and this one doesn't:
main: main.o func.o
gcc main.o func.o -lm -o main
func.o: func.c math.h
main.o: main.c
