Temporary header file '/tmp/7YMo4ILBGC/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) 
#undef unix

  // add includes
  #include "/usr/include/zim/archive.h"
  #include "/usr/include/zim/blob.h"
  #include "/usr/include/zim/entry.h"
  #include "/usr/include/zim/error.h"
  #include "/usr/include/zim/item.h"
  #include "/usr/include/zim/search.h"
  #include "/usr/include/zim/search_iterator.h"
  #include "/usr/include/zim/suggestion.h"
  #include "/usr/include/zim/suggestion_iterator.h"
  #include "/usr/include/zim/tools.h"
  #include "/usr/include/zim/uuid.h"
  #include "/usr/include/zim/version.h"
  #include "/usr/include/zim/writer/contentProvider.h"
  #include "/usr/include/zim/writer/creator.h"
  #include "/usr/include/zim/writer/item.h"
  #include "/usr/include/zim/zim.h"
  #include "/usr/include/zim/zim_config.h"

  // add namespaces
  namespace Xapian{typedef int tmp_add_type_1;}
  Xapian::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace zim{typedef int tmp_add_type_2;}
  zim::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace zim{namespace unix{typedef int tmp_add_type_3;}}
  zim::unix::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace zim{namespace writer{typedef int tmp_add_type_4;}}
  zim::writer::tmp_add_type_4 tmp_add_func_4(){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/7YMo4ILBGC/dump1.h"