Temporary header file '/tmp/zP10vAlIsU/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/sentencepiece_processor.h"
  #include "/usr/include/sentencepiece_trainer.h"

  // add namespaces
  namespace absl{typedef int tmp_add_type_1;}
  absl::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace sentencepiece{typedef int tmp_add_type_2;}
  sentencepiece::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace sentencepiece{namespace io{typedef int tmp_add_type_3;}}
  sentencepiece::io::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace sentencepiece{namespace normalizer{typedef int tmp_add_type_4;}}
  sentencepiece::normalizer::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace sentencepiece{namespace pretokenizer{typedef int tmp_add_type_5;}}
  sentencepiece::pretokenizer::tmp_add_type_5 tmp_add_func_5(){return 0;};
  namespace sentencepiece{namespace util{typedef int tmp_add_type_6;}}
  sentencepiece::util::tmp_add_type_6 tmp_add_func_6(){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/zP10vAlIsU/dump1.h"