Temporary header file '/tmp/5fWY7tFiCp/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
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d) 
#define BSON_INSIDE
#define BSON_COMPILATION

  // add includes
  #include "/usr/include/libbson-1.0/bson/bcon.h"
  #include "/usr/include/libbson-1.0/bson/bson-atomic.h"
  #include "/usr/include/libbson-1.0/bson/bson-clock.h"
  #include "/usr/include/libbson-1.0/bson/bson-cmp.h"
  #include "/usr/include/libbson-1.0/bson/bson-compat.h"
  #include "/usr/include/libbson-1.0/bson/bson-context.h"
  #include "/usr/include/libbson-1.0/bson/bson-decimal128.h"
  #include "/usr/include/libbson-1.0/bson/bson-endian.h"
  #include "/usr/include/libbson-1.0/bson/bson-error.h"
  #include "/usr/include/libbson-1.0/bson/bson-iter.h"
  #include "/usr/include/libbson-1.0/bson/bson-json.h"
  #include "/usr/include/libbson-1.0/bson/bson-keys.h"
  #include "/usr/include/libbson-1.0/bson/bson-macros.h"
  #include "/usr/include/libbson-1.0/bson/bson-md5.h"
  #include "/usr/include/libbson-1.0/bson/bson-memory.h"
  #include "/usr/include/libbson-1.0/bson/bson-oid.h"
  #include "/usr/include/libbson-1.0/bson/bson-reader.h"
  #include "/usr/include/libbson-1.0/bson/bson-string.h"
  #include "/usr/include/libbson-1.0/bson/bson-types.h"
  #include "/usr/include/libbson-1.0/bson/bson-utf8.h"
  #include "/usr/include/libbson-1.0/bson/bson-value.h"
  #include "/usr/include/libbson-1.0/bson/bson-version-functions.h"
  #include "/usr/include/libbson-1.0/bson/bson-writer.h"
  #include "/usr/include/libbson-1.0/bson/bson.h"
  #include "/usr/include/libbson-1.0/bson.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;
  _bcon_append_ctx_t* tmp_add_class_3;
  _bcon_extract_ctx_t* tmp_add_class_4;
  _bson_error_t* tmp_add_class_5;
  _bson_mem_vtable_t* tmp_add_class_6;
  _bson_t* tmp_add_class_7;
  _bson_value_t* tmp_add_class_8;
  bcon_append_ctx_frame* tmp_add_class_9;
  bcon_extract_ctx_frame* tmp_add_class_10;
  f_owner_ex* tmp_add_class_11;
  file_handle* tmp_add_class_12;
  flock64* tmp_add_class_13;
  iovec* tmp_add_class_14;
  itimerval* tmp_add_class_15;
  statx_timestamp* tmp_add_class_16;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/5fWY7tFiCp/dump1.h"