Temporary header file '/tmp/x6e0jcd_dm/dump1.h' with the following content will be compiled to create GCC translation unit dump:

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

  // add includes
  #include "/usr/include/re2/filtered_re2.h"
  #include "/usr/include/re2/re2.h"
  #include "/usr/include/re2/set.h"
  #include "/usr/include/re2/stringpiece.h"

  // add namespaces
  namespace re2{typedef int tmp_add_type_1;}
  re2::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace re2{namespace hooks{typedef int tmp_add_type_2;}}
  re2::hooks::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace re2{namespace re2_internal{typedef int tmp_add_type_3;}}
  re2::re2_internal::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/x6e0jcd_dm/dump1.h"