Temporary header file '/tmp/5_pQ_D6gL2/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)

  // add includes
  #include "/usr/include/cif++/exports.hpp"
  #include "/usr/include/cif++/atom_type.hpp"
  #include "/usr/include/cif++/category.hpp"
  #include "/usr/include/cif++/compound.hpp"
  #include "/usr/include/cif++/condition.hpp"
  #include "/usr/include/cif++/datablock.hpp"
  #include "/usr/include/cif++/dictionary_parser.hpp"
  #include "/usr/include/cif++/file.hpp"
  #include "/usr/include/cif++/format.hpp"
  #include "/usr/include/cif++/forward_decl.hpp"
  #include "/usr/include/cif++/gzio.hpp"
  #include "/usr/include/cif++/item.hpp"
  #include "/usr/include/cif++/iterator.hpp"
  #include "/usr/include/cif++/model.hpp"
  #include "/usr/include/cif++/parser.hpp"
  #include "/usr/include/cif++/pdb/cif2pdb.hpp"
  #include "/usr/include/cif++/pdb/io.hpp"
  #include "/usr/include/cif++/pdb/pdb2cif.hpp"
  #include "/usr/include/cif++/pdb/pdb2cif_remark_3.hpp"
  #include "/usr/include/cif++/pdb/tls.hpp"
  #include "/usr/include/cif++/point.hpp"
  #include "/usr/include/cif++/row.hpp"
  #include "/usr/include/cif++/symmetry.hpp"
  #include "/usr/include/cif++/text.hpp"
  #include "/usr/include/cif++/utilities.hpp"
  #include "/usr/include/cif++/validate.hpp"
  #include "/usr/include/cif++.hpp"

  // add namespaces
  namespace cif{typedef int tmp_add_type_1;}
  cif::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace cif{namespace detail{typedef int tmp_add_type_2;}}
  cif::detail::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace cif{namespace gzio{typedef int tmp_add_type_3;}}
  cif::gzio::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace cif{namespace literals{typedef int tmp_add_type_4;}}
  cif::literals::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace cif{namespace mm{typedef int tmp_add_type_5;}}
  cif::mm::tmp_add_type_5 tmp_add_func_5(){return 0;};
  namespace cif{namespace pdb{typedef int tmp_add_type_6;}}
  cif::pdb::tmp_add_type_6 tmp_add_func_6(){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;
  gzFile_s* tmp_add_class_3;
  gz_header_s* tmp_add_class_4;
  z_stream_s* tmp_add_class_5;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/5_pQ_D6gL2/dump1.h"