Temporary header file '/tmp/fSOsw8QjDO/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/utf8cpp/utf8/checked.h"
  #include "/usr/include/utf8cpp/utf8/core.h"
  #include "/usr/include/utf8cpp/utf8/cpp17.h"
  #include "/usr/include/utf8cpp/utf8/unchecked.h"
  #include "/usr/include/utf8cpp/utf8.h"
  #include "/usr/include/utf8.h"

  // add namespaces
  namespace utf8{typedef int tmp_add_type_1;}
  utf8::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace utf8{namespace internal{typedef int tmp_add_type_2;}}
  utf8::internal::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace utf8{namespace unchecked{typedef int tmp_add_type_3;}}
  utf8::unchecked::tmp_add_type_3 tmp_add_func_3(){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/fSOsw8QjDO/dump1.h"