gprof only showing calls - C program in Ubuntu with WSL1

I am having an issue with "gprof" while using WSL1 and "gcc" in Ubuntu. The only information it displays is the "calls" and anything else is set as 0.00. I do not think that is because the program is running too fast because when typing time ./go it returns:

real = 0.569s; user = 0.547s; sys = 0.000s.

The main program (go.c) is:

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

#define maxloop 1e7

int main(int argc, char*argv[]) {
    int i;
    double x;
    double xsum = 0.0;
    for (i = 1; i < maxloop; i++) {
        x = myFun1(i) + myFun2(i) + myFun3(i);
        xsum += x;
    }
    printf("xsum = %.6f\n", xsum);
    return 0;
}

The file with the functions (functions.c) is:

#include <math.h>

double myFun1(double x) {
    double a = sin(x);
    return a;
}

double myFun2(double x){
    double a = pow(x,3);
    return a;
}

double myFun3(double x){
    double a = sqrt(x);
    return a;
}

The header (functions.h) is:

double myFun1(double x);
double myFun2(double x);
double myFun3(double x);

I am compiling in the terminal as:

gcc -pg -o go go.c functions.c -lm

Running the gprof as:

gprof ./go -p -b

Upgrade to WSL2 for support of the profiling features required by gprof.