Temporary header file '/tmp/Dyagk1W2Po/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/o3dgc/o3dgcAdjacencyInfo.h"
  #include "/usr/include/o3dgc/o3dgcArithmeticCodec.h"
  #include "/usr/include/o3dgc/o3dgcBinaryStream.h"
  #include "/usr/include/o3dgc/o3dgcCommon.h"
  #include "/usr/include/o3dgc/o3dgcDVEncodeParams.h"
  #include "/usr/include/o3dgc/o3dgcDynamicVector.h"
  #include "/usr/include/o3dgc/o3dgcDynamicVectorDecoder.h"
  #include "/usr/include/o3dgc/o3dgcDynamicVectorEncoder.h"
  #include "/usr/include/o3dgc/o3dgcFIFO.h"
  #include "/usr/include/o3dgc/o3dgcIndexedFaceSet.h"
  #include "/usr/include/o3dgc/o3dgcSC3DMCDecoder.h"
  #include "/usr/include/o3dgc/o3dgcSC3DMCEncodeParams.h"
  #include "/usr/include/o3dgc/o3dgcSC3DMCEncoder.h"
  #include "/usr/include/o3dgc/o3dgcTimer.h"
  #include "/usr/include/o3dgc/o3dgcTriangleFans.h"
  #include "/usr/include/o3dgc/o3dgcTriangleListDecoder.h"
  #include "/usr/include/o3dgc/o3dgcTriangleListEncoder.h"
  #include "/usr/include/o3dgc/o3dgcVector.h"

  // add namespaces
  namespace o3dgc{typedef int tmp_add_type_1;}
  o3dgc::tmp_add_type_1 tmp_add_func_1(){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;
  itimerval* tmp_add_class_3;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/Dyagk1W2Po/dump1.h"