Temporary header file '/tmp/2lCRdE_Z1H/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/gav1/decoder.h"
  #include "/usr/include/gav1/decoder_buffer.h"
  #include "/usr/include/gav1/decoder_settings.h"
  #include "/usr/include/gav1/frame_buffer.h"
  #include "/usr/include/gav1/status_code.h"
  #include "/usr/include/gav1/symbol_visibility.h"
  #include "/usr/include/gav1/version.h"

  // add namespaces
  namespace libgav1{typedef int tmp_add_type_1;}
  libgav1::tmp_add_type_1 tmp_add_func_1(){return 0;};

  // add classes
  Libgav1DecoderBuffer* tmp_add_class_0;
  Libgav1DecoderSettings* tmp_add_class_1;
  Libgav1FrameBuffer* tmp_add_class_2;
  Libgav1FrameBufferInfo* tmp_add_class_3;
  Libgav1ObuMetadataHdrCll* tmp_add_class_4;
  Libgav1ObuMetadataHdrMdcv* tmp_add_class_5;
  Libgav1ObuMetadataItutT35* tmp_add_class_6;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/2lCRdE_Z1H/dump1.h"