Temporary header file '/tmp/Y4cn63brYn/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

  // add includes
  #include "/usr/include/protobuf-c/protobuf-c.h"
  #include "/usr/include/google/protobuf-c/protobuf-c.h"

  // add classes
  ProtobufCAllocator* tmp_add_class_0;
  ProtobufCBinaryData* tmp_add_class_1;
  ProtobufCBuffer* tmp_add_class_2;
  ProtobufCBufferSimple* tmp_add_class_3;
  ProtobufCEnumDescriptor* tmp_add_class_4;
  ProtobufCEnumValue* tmp_add_class_5;
  ProtobufCEnumValueIndex* tmp_add_class_6;
  ProtobufCFieldDescriptor* tmp_add_class_7;
  ProtobufCIntRange* tmp_add_class_8;
  ProtobufCMessage* tmp_add_class_9;
  ProtobufCMessageDescriptor* tmp_add_class_10;
  ProtobufCMessageUnknownField* tmp_add_class_11;
  ProtobufCMethodDescriptor* tmp_add_class_12;
  ProtobufCService* tmp_add_class_13;
  ProtobufCServiceDescriptor* tmp_add_class_14;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/Y4cn63brYn/dump1.h"