Temporary header file '/tmp/CNxd6CINfw/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/nghttp3/nghttp3.h"
  #include "/usr/include/nghttp3/version.h"

  // add classes
  nghttp3_buf* tmp_add_class_0;
  nghttp3_callbacks* tmp_add_class_1;
  nghttp3_data_reader* tmp_add_class_2;
  nghttp3_info* tmp_add_class_3;
  nghttp3_mem* tmp_add_class_4;
  nghttp3_nv* tmp_add_class_5;
  nghttp3_pri* tmp_add_class_6;
  nghttp3_qpack_nv* tmp_add_class_7;
  nghttp3_settings* tmp_add_class_8;
  nghttp3_vec* tmp_add_class_9;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/CNxd6CINfw/dump1.h"