Temporary header file '/tmp/sn22B324PM/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/rapidjson/allocators.h"
  #include "/usr/include/rapidjson/document.h"
  #include "/usr/include/rapidjson/encodedstream.h"
  #include "/usr/include/rapidjson/encodings.h"
  #include "/usr/include/rapidjson/error/en.h"
  #include "/usr/include/rapidjson/error/error.h"
  #include "/usr/include/rapidjson/filereadstream.h"
  #include "/usr/include/rapidjson/filewritestream.h"
  #include "/usr/include/rapidjson/fwd.h"
  #include "/usr/include/rapidjson/internal/biginteger.h"
  #include "/usr/include/rapidjson/internal/diyfp.h"
  #include "/usr/include/rapidjson/internal/dtoa.h"
  #include "/usr/include/rapidjson/internal/ieee754.h"
  #include "/usr/include/rapidjson/internal/itoa.h"
  #include "/usr/include/rapidjson/internal/meta.h"
  #include "/usr/include/rapidjson/internal/pow10.h"
  #include "/usr/include/rapidjson/internal/regex.h"
  #include "/usr/include/rapidjson/internal/stack.h"
  #include "/usr/include/rapidjson/internal/strfunc.h"
  #include "/usr/include/rapidjson/internal/strtod.h"
  #include "/usr/include/rapidjson/internal/swap.h"
  #include "/usr/include/rapidjson/istreamwrapper.h"
  #include "/usr/include/rapidjson/memorybuffer.h"
  #include "/usr/include/rapidjson/memorystream.h"
  #include "/usr/include/rapidjson/ostreamwrapper.h"
  #include "/usr/include/rapidjson/pointer.h"
  #include "/usr/include/rapidjson/prettywriter.h"
  #include "/usr/include/rapidjson/rapidjson.h"
  #include "/usr/include/rapidjson/reader.h"
  #include "/usr/include/rapidjson/schema.h"
  #include "/usr/include/rapidjson/stream.h"
  #include "/usr/include/rapidjson/stringbuffer.h"
  #include "/usr/include/rapidjson/writer.h"

  // add namespaces
  namespace rapidjson{typedef int tmp_add_type_1;}
  rapidjson::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace rapidjson{namespace internal{typedef int tmp_add_type_2;}}
  rapidjson::internal::tmp_add_type_2 tmp_add_func_2(){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/sn22B324PM/dump1.h"