Temporary header file '/tmp/DHUKmfNhP6/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/c++/12/cstring"
  #include "/usr/include/libspl/atomic.h"
  #include "/usr/include/libspl/ia32/sys/asm_linkage.h"
  #include "/usr/include/libspl/libdevinfo.h"
  #include "/usr/include/libspl/libgen.h"
  #include "/usr/include/libspl/libshare.h"
  #include "/usr/include/libspl/limits.h"
  #include "/usr/include/libspl/locale.h"
  #include "/usr/include/libspl/sscanf.h"
  #include "/usr/include/libspl/statcommon.h"
  #include "/usr/include/libspl/stdio.h"
  #include "/usr/include/libspl/stdlib.h"
  #include "/usr/include/libspl/string.h"
  #include "/usr/include/libspl/stropts.h"
  #include "/usr/include/libspl/thread.h"
  #include "/usr/include/libspl/tzfile.h"
  #include "/usr/include/libspl/ucred.h"
  #include "/usr/include/libspl/unistd.h"
  #include "/usr/include/libspl/zone.h"
  #include "/usr/include/libzfs/cityhash.h"
  #include "/usr/include/libzfs/libnvpair.h"
  #include "/usr/include/libzfs/libuutil.h"
  #include "/usr/include/libzfs/libuutil_common.h"
  #include "/usr/include/libzfs/libuutil_impl.h"
  #include "/usr/include/libzfs/libzfs.h"
  #include "/usr/include/libzfs/libzfs_core.h"
  #include "/usr/include/libzfs/libzfsbootenv.h"
  #include "/usr/include/libzfs/libzutil.h"
  #include "/usr/include/libzfs/thread_pool.h"
  #include "/usr/include/libzfs/zfeature_common.h"
  #include "/usr/include/libzfs/zfs_comutil.h"
  #include "/usr/include/libzfs/zfs_deleg.h"
  #include "/usr/include/libzfs/zfs_fletcher.h"
  #include "/usr/include/libzfs/zfs_namecheck.h"
  #include "/usr/include/libzfs/zfs_prop.h"

  // add classes
  _G_fpos64_t* tmp_add_class_0;
  _G_fpos_t* tmp_add_class_1;
  _IO_cookie_io_functions_t* tmp_add_class_2;
  _buf* tmp_add_class_3;
  ace_object* tmp_add_class_4;
  avl_node* tmp_add_class_5;
  avl_tree* tmp_add_class_6;
  bootstat* tmp_add_class_7;
  callb_cpr* tmp_add_class_8;
  ddt_histogram* tmp_add_class_9;
  ddt_object* tmp_add_class_10;
  ddt_stat* tmp_add_class_11;
  extmnttab* tmp_add_class_12;
  f_owner_ex* tmp_add_class_13;
  file_handle* tmp_add_class_14;
  fletcher_4_ctx* tmp_add_class_15;
  fletcher_4_func* tmp_add_class_16;
  flock64* tmp_add_class_17;
  get_all_cb* tmp_add_class_18;
  importargs* tmp_add_class_19;
  iovec* tmp_add_class_20;
  itimerspec32* tmp_add_class_21;
  itimerval* tmp_add_class_22;
  kmutex* tmp_add_class_23;
  krwlock* tmp_add_class_24;
  ksiddomain* tmp_add_class_25;
  kstat* tmp_add_class_26;
  kstat_intr* tmp_add_class_27;
  kstat_io* tmp_add_class_28;
  kstat_named* tmp_add_class_29;
  kstat_timer* tmp_add_class_30;
  list* tmp_add_class_31;
  list_node* tmp_add_class_32;
  mntent* tmp_add_class_33;
  mnttab* tmp_add_class_34;
  mount_attr* tmp_add_class_35;
  nv_alloc* tmp_add_class_36;
  nv_alloc_ops* tmp_add_class_37;
  nvlist* tmp_add_class_38;
  nvpair* tmp_add_class_39;
  pool_checkpoint_stat* tmp_add_class_40;
  pool_config_ops* tmp_add_class_41;
  pool_removal_stat* tmp_add_class_42;
  pool_scan_stat* tmp_add_class_43;
  proc* tmp_add_class_44;
  procfs_list* tmp_add_class_45;
  re_pattern_buffer* tmp_add_class_46;
  re_registers* tmp_add_class_47;
  recvflags* tmp_add_class_48;
  renameflags* tmp_add_class_49;
  rlimit64* tmp_add_class_50;
  sendflags* tmp_add_class_51;
  splitflags* tmp_add_class_52;
  statx_timestamp* tmp_add_class_53;
  sysevent* tmp_add_class_54;
  taskq* tmp_add_class_55;
  taskq_ent* tmp_add_class_56;
  termio* tmp_add_class_57;
  timespec32* tmp_add_class_58;
  timeval32* tmp_add_class_59;
  trimflags* tmp_add_class_60;
  tzhead* tmp_add_class_61;
  ucontext_t* tmp_add_class_62;
  umem_cache* tmp_add_class_63;
  uu_avl* tmp_add_class_64;
  uu_avl_node* tmp_add_class_65;
  uu_avl_pool* tmp_add_class_66;
  uu_list* tmp_add_class_67;
  uu_list_node* tmp_add_class_68;
  uu_list_node_impl* tmp_add_class_69;
  uu_list_pool* tmp_add_class_70;
  vattr* tmp_add_class_71;
  vdev_rebuild_stat* tmp_add_class_72;
  vdev_stat* tmp_add_class_73;
  vdev_stat_ex* tmp_add_class_74;
  vsecattr* tmp_add_class_75;
  winsize* tmp_add_class_76;
  xoptattr* tmp_add_class_77;
  xvattr* tmp_add_class_78;
  zfeature_info* tmp_add_class_79;
  zfs_allow* tmp_add_class_80;
  zfs_allow_node* tmp_add_class_81;
  zfs_fletcher_aarch64_neon* tmp_add_class_82;
  zfs_fletcher_avx* tmp_add_class_83;
  zfs_fletcher_avx512* tmp_add_class_84;
  zfs_fletcher_sse* tmp_add_class_85;
  zfs_fletcher_superscalar* tmp_add_class_86;
  zfs_index* tmp_add_class_87;
  zfs_kernel_param* tmp_add_class_88;
  zfs_perm_node* tmp_add_class_89;
  zfs_uio* tmp_add_class_90;
  zio_cksum* tmp_add_class_91;
  zpool_load_policy* tmp_add_class_92;
  zprop_get_cbdata* tmp_add_class_93;
  zprop_list* tmp_add_class_94;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/DHUKmfNhP6/dump1.h"  -I/usr/include/libzfs -I/usr/include/libspl