Temporary header file '/tmp/iI9wYl8OWI/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _TIME_BITS 64
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED

  // add includes
  #include "/usr/include/ZHfstOspeller.h"
  #include "/usr/include/ZHfstOspellerXmlMetadata.h"
  #include "/usr/include/hfst-ol.h"
  #include "/usr/include/hfstol-stdafx.h"
  #include "/usr/include/ol-exceptions.h"
  #include "/usr/include/ospell.h"

  // add namespaces
  namespace hfst_ospell{typedef int tmp_add_type_1;}
  hfst_ospell::tmp_add_type_1 tmp_add_func_1(){return 0;};

  // add classes
  _G_fpos64_t* tmp_add_class_0;
  _G_fpos_t* tmp_add_class_1;
  _IO_cookie_io_functions_t* tmp_add_class_2;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/iI9wYl8OWI/dump1.h"