Exception: Unable to find out actual class definition: '_VectorArgs'.

[kingyuguo]

I use pygccxml to parse Google FlatBuffers (flatbuffers/tests/monster_test_generated.h) with the following configuration:

xml_generator_config = parser.xml_generator_configuration_t(
        xml_generator_path=generator_path,
        xml_generator=generator_name,
        include_paths = ["include","3rd_party/flatbuffers/include"],
        compiler='g++',
        cflags = "-std=c++11"
        )

then error occured:

INFO Parsing source file "3rd_party/flatbuffers/tests/monster_test_generated.h" ...
In file included from 3rd_party/flatbuffers/tests/monster_test_generated.h:7:
In file included from 3rd_party/flatbuffers/include/flatbuffers/flatbuffers.h:20:
3rd_party/flatbuffers/include/flatbuffers/base.h:311:1: warning: unknown attribute 'no_sanitize_undefined' ignored [-Wunknown-attributes]
__supress_ubsan__("alignment")
^
3rd_party/flatbuffers/include/flatbuffers/base.h:216:50: note: expanded from macro '__supress_ubsan__'
  #define __supress_ubsan__(type) __attribute__((no_sanitize_undefined))
                                                 ^
3rd_party/flatbuffers/include/flatbuffers/base.h:318:1: warning: unknown attribute 'no_sanitize_undefined' ignored [-Wunknown-attributes]
__supress_ubsan__("alignment")
^
3rd_party/flatbuffers/include/flatbuffers/base.h:216:50: note: expanded from macro '__supress_ubsan__'
  #define __supress_ubsan__(type) __attribute__((no_sanitize_undefined))
                                                 ^
In file included from 3rd_party/flatbuffers/tests/monster_test_generated.h:8:
In file included from 3rd_party/flatbuffers/include/flatbuffers/flexbuffers.h:24:
3rd_party/flatbuffers/include/flatbuffers/util.h:256:1: warning: unknown attribute 'no_sanitize_undefined' ignored [-Wunknown-attributes]
__supress_ubsan__("float-cast-overflow")
^
3rd_party/flatbuffers/include/flatbuffers/base.h:216:50: note: expanded from macro '__supress_ubsan__'
  #define __supress_ubsan__(type) __attribute__((no_sanitize_undefined))
                                                 ^
3 warnings generated.
Traceback (most recent call last):
  File "parser.py", line 29, in <module>
    decls = parser.parse([filename], xml_generator_config)
  File "/home/research/anaconda3/lib/python3.8/site-packages/pygccxml/parser/__init__.py", line 51, in parse
    declarations = parser.read_files(files, compilation_mode)
  File "/home/research/anaconda3/lib/python3.8/site-packages/pygccxml/parser/project_reader.py", line 264, in read_files
    return self.__parse_file_by_file(files)
  File "/home/research/anaconda3/lib/python3.8/site-packages/pygccxml/parser/project_reader.py", line 335, in __parse_file_by_file
    self._relink_declarated_types(leaved_classes, types)
  File "/home/research/anaconda3/lib/python3.8/site-packages/pygccxml/parser/project_reader.py", line 566, in _relink_declarated_types
    raise Exception(os.linesep.join(msg))
Exception: Unable to find out actual class definition: '_VectorArgs'.
Class definition has been changed from one compilation to an other.
Why did it happen to me? Here is a short list of reasons:
    1. There are different preprocessor definitions applied on same file during compilation
    2. Bug in pygccxml.

I looked in the file "monster_test_generated.h" and I found some code like this:

inline flatbuffers::Offset<TestSimpleTableWithEnum> CreateTestSimpleTableWithEnum(flatbuffers::FlatBufferBuilder &_fbb, const TestSimpleTableWithEnumT *_o, const flatbuffers::rehasher_function_t *_rehasher) {
  (void)_rehasher;
  (void)_o;
  struct _VectorArgs { flatbuffers::FlatBufferBuilder *__fbb; const TestSimpleTableWithEnumT* __o; const flatbuffers::rehasher_function_t *__rehasher; } _va = { &_fbb, _o, _rehasher}; (void)_va;
  auto _color = _o->color;
  return MyGame::Example::CreateTestSimpleTableWithEnum(
      _fbb,
      _color);
}
inline flatbuffers::Offset<Stat> CreateStat(flatbuffers::FlatBufferBuilder &_fbb, const StatT *_o, const flatbuffers::rehasher_function_t *_rehasher) {
  (void)_rehasher;
  (void)_o;
  struct _VectorArgs { flatbuffers::FlatBufferBuilder *__fbb; const StatT* __o; const flatbuffers::rehasher_function_t *__rehasher; } _va = { &_fbb, _o, _rehasher}; (void)_va;
  auto _id = _o->id.empty() ? 0 : _fbb.CreateString(_o->id);
  auto _val = _o->val;
  auto _count = _o->count;
  return MyGame::Example::CreateStat(
      _fbb,
      _id,
      _val,
      _count);
}

is this a bug of pygccxml？thanks