Temporary header file '/tmp/r5wwYQtxT9/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/I2util/Pthread.h"
  #include "/usr/include/I2util/addr.h"
  #include "/usr/include/I2util/conf.h"
  #include "/usr/include/I2util/errlog.h"
  #include "/usr/include/I2util/errlogimmediate.h"
  #include "/usr/include/I2util/errlogsyslog.h"
  #include "/usr/include/I2util/hex.h"
  #include "/usr/include/I2util/hmac-sha1.h"
  #include "/usr/include/I2util/io.h"
  #include "/usr/include/I2util/mach_dep.h"
  #include "/usr/include/I2util/md5.h"
  #include "/usr/include/I2util/pbkdf2.h"
  #include "/usr/include/I2util/random.h"
  #include "/usr/include/I2util/readpassphrase.h"
  #include "/usr/include/I2util/saddr.h"
  #include "/usr/include/I2util/sha1.h"
  #include "/usr/include/I2util/sha1P.h"
  #include "/usr/include/I2util/table.h"
  #include "/usr/include/I2util/util.h"

  // add classes
  I2ErrLogEvent* tmp_add_class_0;
  I2ErrLogSyslogAttr_* tmp_add_class_1;
  I2LogImmediateAttr_* tmp_add_class_2;
  I2Sha1ContextRec* tmp_add_class_3;
  _G_fpos64_t* tmp_add_class_4;
  _G_fpos_t* tmp_add_class_5;
  _I2SockUnion* tmp_add_class_6;
  _IO_cookie_io_functions_t* tmp_add_class_7;
  addrinfo* tmp_add_class_8;
  cmsghdr* tmp_add_class_9;
  f_owner_ex* tmp_add_class_10;
  file_handle* tmp_add_class_11;
  flock64* tmp_add_class_12;
  gaicb* tmp_add_class_13;
  group_filter* tmp_add_class_14;
  group_req* tmp_add_class_15;
  group_source_req* tmp_add_class_16;
  hostent* tmp_add_class_17;
  in6_addr* tmp_add_class_18;
  in6_pktinfo* tmp_add_class_19;
  in_addr* tmp_add_class_20;
  in_pktinfo* tmp_add_class_21;
  iovec* tmp_add_class_22;
  ip6_mtuinfo* tmp_add_class_23;
  ip_mreq* tmp_add_class_24;
  ip_mreq_source* tmp_add_class_25;
  ip_mreqn* tmp_add_class_26;
  ip_msfilter* tmp_add_class_27;
  ip_opts* tmp_add_class_28;
  ipv6_mreq* tmp_add_class_29;
  linger* tmp_add_class_30;
  mmsghdr* tmp_add_class_31;
  msghdr* tmp_add_class_32;
  netent* tmp_add_class_33;
  osockaddr* tmp_add_class_34;
  protoent* tmp_add_class_35;
  rpcent* tmp_add_class_36;
  servent* tmp_add_class_37;
  sockaddr* tmp_add_class_38;
  sockaddr_in* tmp_add_class_39;
  sockaddr_in6* tmp_add_class_40;
  sockaddr_storage* tmp_add_class_41;
  ucred* tmp_add_class_42;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/r5wwYQtxT9/dump1.h"

In file included from /usr/include/I2util/util.h:70,
                 from /usr/include/I2util/Pthread.h:36,
                 from /tmp/r5wwYQtxT9/dump1.h:12:
/usr/include/I2util/table.h:39:25: error: conflicting declaration ‘typedef struct I2Table* I2Table’
   39 | typedef struct I2Table *I2Table;
      |                         ^~~~~~~
/usr/include/I2util/table.h:39:16: note: previous declaration as ‘struct I2Table’
   39 | typedef struct I2Table *I2Table;
      |                ^~~~~~~