Temporary header file '/tmp/34JkfK00Wc/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/leveldb/c.h"
  #include "/usr/include/leveldb/cache.h"
  #include "/usr/include/leveldb/comparator.h"
  #include "/usr/include/leveldb/db.h"
  #include "/usr/include/leveldb/dumpfile.h"
  #include "/usr/include/leveldb/env.h"
  #include "/usr/include/leveldb/export.h"
  #include "/usr/include/leveldb/filter_policy.h"
  #include "/usr/include/leveldb/helpers/memenv.h"
  #include "/usr/include/leveldb/iterator.h"
  #include "/usr/include/leveldb/options.h"
  #include "/usr/include/leveldb/slice.h"
  #include "/usr/include/leveldb/status.h"
  #include "/usr/include/leveldb/table.h"
  #include "/usr/include/leveldb/table_builder.h"
  #include "/usr/include/leveldb/write_batch.h"

  // add namespaces
  namespace leveldb{typedef int tmp_add_type_1;}
  leveldb::tmp_add_type_1 tmp_add_func_1(){return 0;};

  // 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;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/34JkfK00Wc/dump1.h"