Temporary header file '/tmp/B4ArhRQIXM/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
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/xapian.h"
  #include "/usr/include/xapian/attributes.h"
  #include "/usr/include/xapian/compactor.h"
  #include "/usr/include/xapian/constants.h"
  #include "/usr/include/xapian/constinfo.h"
  #include "/usr/include/xapian/database.h"
  #include "/usr/include/xapian/dbfactory.h"
  #include "/usr/include/xapian/deprecated.h"
  #include "/usr/include/xapian/document.h"
  #include "/usr/include/xapian/enquire.h"
  #include "/usr/include/xapian/error.h"
  #include "/usr/include/xapian/errorhandler.h"
  #include "/usr/include/xapian/eset.h"
  #include "/usr/include/xapian/expanddecider.h"
  #include "/usr/include/xapian/geospatial.h"
  #include "/usr/include/xapian/intrusive_ptr.h"
  #include "/usr/include/xapian/iterator.h"
  #include "/usr/include/xapian/keymaker.h"
  #include "/usr/include/xapian/matchspy.h"
  #include "/usr/include/xapian/mset.h"
  #include "/usr/include/xapian/positioniterator.h"
  #include "/usr/include/xapian/postingiterator.h"
  #include "/usr/include/xapian/postingsource.h"
  #include "/usr/include/xapian/query.h"
  #include "/usr/include/xapian/queryparser.h"
  #include "/usr/include/xapian/registry.h"
  #include "/usr/include/xapian/stem.h"
  #include "/usr/include/xapian/termgenerator.h"
  #include "/usr/include/xapian/termiterator.h"
  #include "/usr/include/xapian/types.h"
  #include "/usr/include/xapian/unicode.h"
  #include "/usr/include/xapian/valueiterator.h"
  #include "/usr/include/xapian/valuesetmatchdecider.h"
  #include "/usr/include/xapian/version.h"
  #include "/usr/include/xapian/visibility.h"
  #include "/usr/include/xapian/weight.h"

  // add namespaces
  namespace Xapian{typedef int tmp_add_type_1;}
  Xapian::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace Xapian{namespace Auto{typedef int tmp_add_type_2;}}
  Xapian::Auto::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace Xapian{namespace Chert{typedef int tmp_add_type_3;}}
  Xapian::Chert::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace Xapian{namespace InMemory{typedef int tmp_add_type_4;}}
  Xapian::InMemory::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace Xapian{namespace Internal{typedef int tmp_add_type_5;}}
  Xapian::Internal::tmp_add_type_5 tmp_add_func_5(){return 0;};
  namespace Xapian{namespace Remote{typedef int tmp_add_type_6;}}
  Xapian::Remote::tmp_add_type_6 tmp_add_func_6(){return 0;};
  namespace Xapian{namespace Unicode{typedef int tmp_add_type_7;}}
  Xapian::Unicode::tmp_add_type_7 tmp_add_func_7(){return 0;};
  namespace Xapian{namespace Unicode{namespace Internal{typedef int tmp_add_type_8;}}}
  Xapian::Unicode::Internal::tmp_add_type_8 tmp_add_func_8(){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/B4ArhRQIXM/dump1.h"