How to find a linux machine endianness ?

Question

When I configure my google test framework for a 32 bit machine, I can run all my test cases successfully with no unpredictable behavior. But when I configure it for a 64 bit machine & run my test cases, it gives severe & abrupt crashes. It crashes in places where it is not supposed to. I tried debugging the issue but was out of my depths. I am not sure if there is a problem while configuring the google test framework for 64 bit or maybe it does not support 64 bit. Any help would be appreciated. Please feel free to get in touch if any clarity is required regarding the query I have shared.
Note : The same code base works perfect on a 32 bit machine.

Answer 1

int main()
{
  int x = 1;
  char *ptr = (char*)&x;

   if (*ptr)
   {
      printf("Little Endianness");
   }
   else
   {
      printf("Big Endianness");
   }

  return 0;
}

My machine is "Little Endianness" .

Answer 2

Try the command lscpu -- it prints out the endianness.