tell GNU gcc to not try to optimize the atom style tester tool

#include <cstring>

#include <mpi.h>

#if !defined(_FORTIFY_SOURCE) || (_FORTIFY_SOURCE == 0)

#  if defined(__INTEL_COMPILER)

#    define _do_nothing

#  elif defined(__GNUC__)

#    if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 9))

#      pragma GCC optimize ("no-var-tracking-assignments","O0")

#    else

#      pragma GCC optimize ("no-var-tracking-assignments")

#    endif

#  else

#    define _do_nothing

#  endif

#endif

// whether to print verbose output (i.e. not capturing LAMMPS screen output).

bool verbose = false;