Temporary header file '/tmp/RGvN19FJou/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/spng.h"

  // 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;
  spng_alloc* tmp_add_class_3;
  spng_bkgd* tmp_add_class_4;
  spng_chrm* tmp_add_class_5;
  spng_chrm_int* tmp_add_class_6;
  spng_chunk* tmp_add_class_7;
  spng_exif* tmp_add_class_8;
  spng_hist* tmp_add_class_9;
  spng_iccp* tmp_add_class_10;
  spng_ihdr* tmp_add_class_11;
  spng_offs* tmp_add_class_12;
  spng_phys* tmp_add_class_13;
  spng_plte* tmp_add_class_14;
  spng_plte_entry* tmp_add_class_15;
  spng_row_info* tmp_add_class_16;
  spng_sbit* tmp_add_class_17;
  spng_splt* tmp_add_class_18;
  spng_splt_entry* tmp_add_class_19;
  spng_text* tmp_add_class_20;
  spng_time* tmp_add_class_21;
  spng_trns* tmp_add_class_22;
  spng_unknown_chunk* tmp_add_class_23;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/RGvN19FJou/dump1.h"