Perf on a code using exp function from Math.h shows time spent in resolving conflicts e_exp,w_exp

my code computes in a loop exp of a large data array and when I tried to do Perf to profile the code, I get to see

Symbols conflicting in multiple files

/build/buildd/eglibc-2.19/math/../sysdeps/ieee754/dbl-64/e_exp.c

/build/buildd/eglibc-2.19/math/../sysdeps/ieee754/dbl-64/w_exp.c

I am using C++ and included "math.h", and a flag to specify std=c++11.

I am not sure why this conflict happens!

A simple snippet to generate this issue is to compile the below(release config) and run perf..

  #include <iostream>
  #include <math.h>

    using namespace std;
    int main()
    {

      double d = 0;
      double e = 0;
      for (int i=0;i<8192;i++)
        for (int j=0;j<=255;j++)
        {
         e = ((j/255)-0.5)*((j/255)-0.5);
         e = exp(e);
         d = d + e;
        }
      cout<<d;

      return 0; 

}

Please help, it appears that the conflicts change with the magnitude of the value that goes into exp..Thank you.