CODEWITHSUNDEEP
cgcccompiler-errors
Matteo
Matteo

Reputation: 529

Strange compilation issue with gcc

Why does the following program compile with gcc, ...

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

void foo(double x) {
   printf("%f", sin(2));
}

int main() {
   foo(1);
}

... while this other program doesn't?

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

void foo(double x) {
   printf("%f", sin(x));
}

int main() {
   foo(1);
}

It gives the following error message: 

/tmp/ccVT7jlb.o: nella funzione "foo":
fun.c:(.text+0x1b): riferimento non definito a "sin"
collect2: error: ld returned 1 exit status*

Upvotes: 1

Views: 44

Answers (1)

Iharob Al Asimi
Iharob Al Asimi

Reputation: 53016

You need to link to libm.so like this 

gcc -Wall -Wextra -Werror source.c -o executable -lm

see the -lm

Upvotes: 2

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