Temporary header file '/tmp/kyFk21oq63/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/coap2/address.h"
  #include "/usr/include/coap2/async.h"
  #include "/usr/include/coap2/bits.h"
  #include "/usr/include/coap2/block.h"
  #include "/usr/include/coap2/coap.h"
  #include "/usr/include/coap2/coap_debug.h"
  #include "/usr/include/coap2/coap_dtls.h"
  #include "/usr/include/coap2/coap_event.h"
  #include "/usr/include/coap2/coap_forward_decls.h"
  #include "/usr/include/coap2/coap_hashkey.h"
  #include "/usr/include/coap2/coap_io.h"
  #include "/usr/include/coap2/coap_mutex.h"
  #include "/usr/include/coap2/coap_session.h"
  #include "/usr/include/coap2/coap_time.h"
  #include "/usr/include/coap2/encode.h"
  #include "/usr/include/coap2/libcoap.h"
  #include "/usr/include/coap2/mem.h"
  #include "/usr/include/coap2/net.h"
  #include "/usr/include/coap2/option.h"
  #include "/usr/include/coap2/pdu.h"
  #include "/usr/include/coap2/prng.h"
  #include "/usr/include/coap2/resource.h"
  #include "/usr/include/coap2/str.h"
  #include "/usr/include/coap2/subscribe.h"
  #include "/usr/include/coap2/uri.h"
  #include "/usr/include/coap2/uthash.h"

  // add classes
  UT_hash_bucket* tmp_add_class_0;
  UT_hash_handle* tmp_add_class_1;
  UT_hash_table* tmp_add_class_2;
  cmsghdr* tmp_add_class_3;
  coap_addr_tuple_t* tmp_add_class_4;
  coap_address_t* tmp_add_class_5;
  coap_async_state_t* tmp_add_class_6;
  coap_attr_t* tmp_add_class_7;
  coap_binary_t* tmp_add_class_8;
  coap_context_t* tmp_add_class_9;
  coap_dtls_key_t* tmp_add_class_10;
  coap_dtls_pki_t* tmp_add_class_11;
  coap_fixed_point_t* tmp_add_class_12;
  coap_optlist_t* tmp_add_class_13;
  coap_packet_t* tmp_add_class_14;
  coap_pdu_t* tmp_add_class_15;
  coap_pki_key_asn1_t* tmp_add_class_16;
  coap_pki_key_pem_t* tmp_add_class_17;
  coap_queue_t* tmp_add_class_18;
  coap_resource_t* tmp_add_class_19;
  coap_session_t* tmp_add_class_20;
  coap_socket_t* tmp_add_class_21;
  coap_str_const_t* tmp_add_class_22;
  coap_string_t* tmp_add_class_23;
  coap_tls_version_t* tmp_add_class_24;
  group_filter* tmp_add_class_25;
  group_req* tmp_add_class_26;
  group_source_req* tmp_add_class_27;
  in6_addr* tmp_add_class_28;
  in6_pktinfo* tmp_add_class_29;
  in_addr* tmp_add_class_30;
  in_pktinfo* tmp_add_class_31;
  iovec* tmp_add_class_32;
  ip6_mtuinfo* tmp_add_class_33;
  ip_mreq* tmp_add_class_34;
  ip_mreq_source* tmp_add_class_35;
  ip_mreqn* tmp_add_class_36;
  ip_msfilter* tmp_add_class_37;
  ip_opts* tmp_add_class_38;
  ipv6_mreq* tmp_add_class_39;
  itimerval* tmp_add_class_40;
  linger* tmp_add_class_41;
  mmsghdr* tmp_add_class_42;
  msghdr* tmp_add_class_43;
  osockaddr* tmp_add_class_44;
  sockaddr* tmp_add_class_45;
  sockaddr_in* tmp_add_class_46;
  sockaddr_in6* tmp_add_class_47;
  sockaddr_storage* tmp_add_class_48;
  ucred* tmp_add_class_49;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/kyFk21oq63/dump1.h"