Temporary header file '/tmp/3KMV3mRUfd/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#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/opencc/BinaryDict.hpp"
  #include "/usr/include/opencc/Common.hpp"
  #include "/usr/include/opencc/Config.hpp"
  #include "/usr/include/opencc/Conversion.hpp"
  #include "/usr/include/opencc/ConversionChain.hpp"
  #include "/usr/include/opencc/Converter.hpp"
  #include "/usr/include/opencc/DartsDict.hpp"
  #include "/usr/include/opencc/Dict.hpp"
  #include "/usr/include/opencc/DictConverter.hpp"
  #include "/usr/include/opencc/DictEntry.hpp"
  #include "/usr/include/opencc/DictGroup.hpp"
  #include "/usr/include/opencc/Exception.hpp"
  #include "/usr/include/opencc/Export.hpp"
  #include "/usr/include/opencc/Lexicon.hpp"
  #include "/usr/include/opencc/MarisaDict.hpp"
  #include "/usr/include/opencc/MaxMatchSegmentation.hpp"
  #include "/usr/include/opencc/Optional.hpp"
  #include "/usr/include/opencc/PhraseExtract.hpp"
  #include "/usr/include/opencc/Segmentation.hpp"
  #include "/usr/include/opencc/Segments.hpp"
  #include "/usr/include/opencc/SerializableDict.hpp"
  #include "/usr/include/opencc/SerializedValues.hpp"
  #include "/usr/include/opencc/SimpleConverter.hpp"
  #include "/usr/include/opencc/TextDict.hpp"
  #include "/usr/include/opencc/UTF8StringSlice.hpp"
  #include "/usr/include/opencc/UTF8Util.hpp"
  #include "/usr/include/opencc/opencc.h"
  #include "/usr/include/opencc/opencc_config.h"

  // add namespaces
  namespace opencc{typedef int tmp_add_type_1;}
  opencc::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace opencc{namespace internal{typedef int tmp_add_type_2;}}
  opencc::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/3KMV3mRUfd/dump1.h"