Temporary header file '/tmp/5puNaU3Kgx/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#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/lib/lv2/atom.lv2/atom.h"
  #include "/usr/lib/lv2/atom.lv2/forge.h"
  #include "/usr/lib/lv2/atom.lv2/util.h"
  #include "/usr/lib/lv2/buf-size.lv2/buf-size.h"
  #include "/usr/lib/lv2/core.lv2/attributes.h"
  #include "/usr/lib/lv2/core.lv2/lv2.h"
  #include "/usr/lib/lv2/core.lv2/lv2_util.h"
  #include "/usr/lib/lv2/data-access.lv2/data-access.h"
  #include "/usr/lib/lv2/dynmanifest.lv2/dynmanifest.h"
  #include "/usr/lib/lv2/event.lv2/event-helpers.h"
  #include "/usr/lib/lv2/event.lv2/event.h"
  #include "/usr/lib/lv2/instance-access.lv2/instance-access.h"
  #include "/usr/lib/lv2/log.lv2/log.h"
  #include "/usr/lib/lv2/log.lv2/logger.h"
  #include "/usr/lib/lv2/midi.lv2/midi.h"
  #include "/usr/lib/lv2/morph.lv2/morph.h"
  #include "/usr/lib/lv2/options.lv2/options.h"
  #include "/usr/lib/lv2/parameters.lv2/parameters.h"
  #include "/usr/lib/lv2/patch.lv2/patch.h"
  #include "/usr/lib/lv2/port-groups.lv2/port-groups.h"
  #include "/usr/lib/lv2/port-props.lv2/port-props.h"
  #include "/usr/lib/lv2/presets.lv2/presets.h"
  #include "/usr/lib/lv2/resize-port.lv2/resize-port.h"
  #include "/usr/lib/lv2/state.lv2/state.h"
  #include "/usr/lib/lv2/time.lv2/time.h"
  #include "/usr/lib/lv2/ui.lv2/ui.h"
  #include "/usr/lib/lv2/units.lv2/units.h"
  #include "/usr/lib/lv2/uri-map.lv2/uri-map.h"
  #include "/usr/lib/lv2/urid.lv2/urid.h"
  #include "/usr/lib/lv2/worker.lv2/worker.h"
  #include "/usr/include/lv2.h"

  // add classes
  LV2UI_Descriptor* tmp_add_class_0;
  LV2_Atom_Forge_Frame* tmp_add_class_1;
  LV2_Descriptor* tmp_add_class_2;
  _G_fpos64_t* tmp_add_class_3;
  _G_fpos_t* tmp_add_class_4;
  _IO_cookie_io_functions_t* tmp_add_class_5;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/5puNaU3Kgx/dump1.h"