Temporary header file '/tmp/g1hAxZedZH/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/udns.h"

  // add classes
  dns_mx* tmp_add_class_0;
  dns_nameval* tmp_add_class_1;
  dns_naptr* tmp_add_class_2;
  dns_parse* tmp_add_class_3;
  dns_rr* tmp_add_class_4;
  dns_rr_a4* tmp_add_class_5;
  dns_rr_a6* tmp_add_class_6;
  dns_rr_mx* tmp_add_class_7;
  dns_rr_naptr* tmp_add_class_8;
  dns_rr_null* tmp_add_class_9;
  dns_rr_ptr* tmp_add_class_10;
  dns_rr_srv* tmp_add_class_11;
  dns_rr_txt* tmp_add_class_12;
  dns_srv* tmp_add_class_13;
  dns_txt* tmp_add_class_14;
  udns_jranctx* tmp_add_class_15;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/g1hAxZedZH/dump1.h"