Temporary header file '/tmp/qDgvs5ii1w/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
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/geotiff/geotiffio.h"
  #include "/usr/include/geotiff/geo_tiffp.h"
  #include "/usr/include/geotiff/cpl_serv.h"
  #include "/usr/include/geotiff/geo_config.h"
  #include "/usr/include/geotiff/geo_keyp.h"
  #include "/usr/include/geotiff/geo_normalize.h"
  #include "/usr/include/geotiff/geo_simpletags.h"
  #include "/usr/include/geotiff/geokeys.h"
  #include "/usr/include/geotiff/geonames.h"
  #include "/usr/include/geotiff/geotiff.h"
  #include "/usr/include/geotiff/geovalues.h"
  #include "/usr/include/geotiff/xtiffio.h"

  // add classes
  GeoKey* tmp_add_class_0;
  KeyEntry* tmp_add_class_1;
  KeyHeader* tmp_add_class_2;
  P5_FACTORS* tmp_add_class_3;
  PJ_COORD* tmp_add_class_4;
  PJ_ELLPS* tmp_add_class_5;
  PJ_GRID_INFO* tmp_add_class_6;
  PJ_INFO* tmp_add_class_7;
  PJ_INIT_INFO* tmp_add_class_8;
  PJ_LIST* tmp_add_class_9;
  PJ_PRIME_MERIDIANS* tmp_add_class_10;
  PJ_PROJ_INFO* tmp_add_class_11;
  PJ_UNITS* tmp_add_class_12;
  PROJ_FILE_API* tmp_add_class_13;
  TempKeyData* tmp_add_class_14;
  _G_fpos64_t* tmp_add_class_15;
  _G_fpos_t* tmp_add_class_16;
  _IO_cookie_io_functions_t* tmp_add_class_17;
  _KeyInfo* tmp_add_class_18;
  _TIFFMethod* tmp_add_class_19;
  _TIFFRGBAImage* tmp_add_class_20;
  gtiff* tmp_add_class_21;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/qDgvs5ii1w/dump1.h"