Temporary header file '/tmp/V_OWTS3icm/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

  // add includes
  #include "/usr/include/wpe-1.0/wpe/libwpe-version.h"
  #include "/usr/include/wpe-1.0/wpe/wpe-egl.h"
  #include "/usr/include/wpe-1.0/wpe/wpe.h"

  // add classes
  wpe_gamepad_client_interface* tmp_add_class_0;
  wpe_gamepad_interface* tmp_add_class_1;
  wpe_gamepad_provider_client_interface* tmp_add_class_2;
  wpe_gamepad_provider_interface* tmp_add_class_3;
  wpe_input_axis_2d_event* tmp_add_class_4;
  wpe_input_axis_event* tmp_add_class_5;
  wpe_input_keyboard_event* tmp_add_class_6;
  wpe_input_pointer_event* tmp_add_class_7;
  wpe_input_touch_event* tmp_add_class_8;
  wpe_input_touch_event_raw* tmp_add_class_9;
  wpe_loader_interface* tmp_add_class_10;
  wpe_pasteboard_interface* tmp_add_class_11;
  wpe_pasteboard_string* tmp_add_class_12;
  wpe_pasteboard_string_map* tmp_add_class_13;
  wpe_pasteboard_string_pair* tmp_add_class_14;
  wpe_pasteboard_string_vector* tmp_add_class_15;
  wpe_process_provider_interface* tmp_add_class_16;
  wpe_renderer_backend_egl_base* tmp_add_class_17;
  wpe_renderer_backend_egl_interface* tmp_add_class_18;
  wpe_renderer_backend_egl_offscreen_target_base* tmp_add_class_19;
  wpe_renderer_backend_egl_offscreen_target_interface* tmp_add_class_20;
  wpe_renderer_backend_egl_target_base* tmp_add_class_21;
  wpe_renderer_backend_egl_target_client* tmp_add_class_22;
  wpe_renderer_backend_egl_target_interface* tmp_add_class_23;
  wpe_renderer_host_base* tmp_add_class_24;
  wpe_renderer_host_interface* tmp_add_class_25;
  wpe_view_backend_base* tmp_add_class_26;
  wpe_view_backend_client* tmp_add_class_27;
  wpe_view_backend_fullscreen_client* tmp_add_class_28;
  wpe_view_backend_input_client* tmp_add_class_29;
  wpe_view_backend_interface* tmp_add_class_30;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/V_OWTS3icm/dump1.h"  -I/usr/include/wpe-1.0