Temporary header file '/tmp/LmkQDFgvWx/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

  // add includes
  #include "/usr/include/libdecor-0/libdecor.h"

  // add classes
  libdecor_frame_interface* tmp_add_class_0;
  libdecor_interface* tmp_add_class_1;
  wl_argument* tmp_add_class_2;
  wl_array* tmp_add_class_3;
  wl_buffer_listener* tmp_add_class_4;
  wl_callback_listener* tmp_add_class_5;
  wl_data_device_listener* tmp_add_class_6;
  wl_data_offer_listener* tmp_add_class_7;
  wl_data_source_listener* tmp_add_class_8;
  wl_display_listener* tmp_add_class_9;
  wl_interface* tmp_add_class_10;
  wl_keyboard_listener* tmp_add_class_11;
  wl_list* tmp_add_class_12;
  wl_message* tmp_add_class_13;
  wl_output_listener* tmp_add_class_14;
  wl_pointer_listener* tmp_add_class_15;
  wl_registry_listener* tmp_add_class_16;
  wl_seat_listener* tmp_add_class_17;
  wl_shell_surface_listener* tmp_add_class_18;
  wl_shm_listener* tmp_add_class_19;
  wl_surface_listener* tmp_add_class_20;
  wl_touch_listener* tmp_add_class_21;

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