Temporary header file '/tmp/A28nPUubJC/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
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/netpbm/colorname.h"
  #include "/usr/include/netpbm/mallocvar.h"
  #include "/usr/include/netpbm/pam.h"
  #include "/usr/include/netpbm/pamdraw.h"
  #include "/usr/include/netpbm/pammap.h"
  #include "/usr/include/netpbm/pbm.h"
  #include "/usr/include/netpbm/pbmfont.h"
  #include "/usr/include/netpbm/pbmfontdata.h"
  #include "/usr/include/netpbm/pgm.h"
  #include "/usr/include/netpbm/pm.h"
  #include "/usr/include/netpbm/pm_config.h"
  #include "/usr/include/netpbm/pm_gamma.h"
  #include "/usr/include/netpbm/pm_system.h"
  #include "/usr/include/netpbm/pnm.h"
  #include "/usr/include/netpbm/ppm.h"
  #include "/usr/include/netpbm/ppmdfont.h"
  #include "/usr/include/netpbm/ppmdraw.h"
  #include "/usr/include/netpbm/shhopt.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;
  bufferDesc* tmp_add_class_3;
  colorfile_entry* tmp_add_class_4;
  colorhist_item* tmp_add_class_5;
  colorhist_list_item* tmp_add_class_6;
  f_owner_ex* tmp_add_class_7;
  file_handle* tmp_add_class_8;
  flock64* tmp_add_class_9;
  font* tmp_add_class_10;
  font2* tmp_add_class_11;
  glyph* tmp_add_class_12;
  hsv* tmp_add_class_13;
  iovec* tmp_add_class_14;
  optNameValue* tmp_add_class_15;
  pam* tmp_add_class_16;
  pamd_linelegparms* tmp_add_class_17;
  pamtuples* tmp_add_class_18;
  pm_selector* tmp_add_class_19;
  ppmd_font* tmp_add_class_20;
  ppmd_fontHeader* tmp_add_class_21;
  ppmd_glyph* tmp_add_class_22;
  ppmd_glyphCommand* tmp_add_class_23;
  ppmd_glyphHeader* tmp_add_class_24;
  ppmd_linelegparms* tmp_add_class_25;
  statx_timestamp* tmp_add_class_26;
  tupleint* tmp_add_class_27;
  tupleint_list_item* tmp_add_class_28;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/A28nPUubJC/dump1.h"