Temporary header file '/tmp/N7fGvszWQb/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/HepMC3/AssociatedParticle.h"
  #include "/usr/include/HepMC3/Attribute.h"
  #include "/usr/include/HepMC3/Data/GenEventData.h"
  #include "/usr/include/HepMC3/Data/GenParticleData.h"
  #include "/usr/include/HepMC3/Data/GenRunInfoData.h"
  #include "/usr/include/HepMC3/Data/GenVertexData.h"
  #include "/usr/include/HepMC3/Errors.h"
  #include "/usr/include/HepMC3/FourVector.h"
  #include "/usr/include/HepMC3/GenCrossSection.h"
  #include "/usr/include/HepMC3/GenCrossSection_fwd.h"
  #include "/usr/include/HepMC3/GenEvent.h"
  #include "/usr/include/HepMC3/GenHeavyIon.h"
  #include "/usr/include/HepMC3/GenHeavyIon_fwd.h"
  #include "/usr/include/HepMC3/GenParticle.h"
  #include "/usr/include/HepMC3/GenParticle_fwd.h"
  #include "/usr/include/HepMC3/GenPdfInfo.h"
  #include "/usr/include/HepMC3/GenPdfInfo_fwd.h"
  #include "/usr/include/HepMC3/GenRunInfo.h"
  #include "/usr/include/HepMC3/GenVertex.h"
  #include "/usr/include/HepMC3/GenVertex_fwd.h"
  #include "/usr/include/HepMC3/HEPEVT_Wrapper.h"
  #include "/usr/include/HepMC3/HepMC3.h"
  #include "/usr/include/HepMC3/LHEF.h"
  #include "/usr/include/HepMC3/LHEFAttributes.h"
  #include "/usr/include/HepMC3/Print.h"
  #include "/usr/include/HepMC3/PrintStreams.h"
  #include "/usr/include/HepMC3/Reader.h"
  #include "/usr/include/HepMC3/ReaderAscii.h"
  #include "/usr/include/HepMC3/ReaderAsciiHepMC2.h"
  #include "/usr/include/HepMC3/ReaderFactory.h"
  #include "/usr/include/HepMC3/ReaderHEPEVT.h"
  #include "/usr/include/HepMC3/ReaderLHEF.h"
  #include "/usr/include/HepMC3/Setup.h"
  #include "/usr/include/HepMC3/Units.h"
  #include "/usr/include/HepMC3/Version.h"
  #include "/usr/include/HepMC3/Writer.h"
  #include "/usr/include/HepMC3/WriterAscii.h"
  #include "/usr/include/HepMC3/WriterAsciiHepMC2.h"
  #include "/usr/include/HepMC3/WriterHEPEVT.h"

  // add namespaces
  namespace HepMC3{typedef int tmp_add_type_1;}
  HepMC3::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace LHEF{typedef int tmp_add_type_2;}
  LHEF::tmp_add_type_2 tmp_add_func_2(){return 0;};

  // add classes
  HEPEVT* tmp_add_class_0;
  _G_fpos64_t* tmp_add_class_1;
  _G_fpos_t* tmp_add_class_2;
  _IO_cookie_io_functions_t* tmp_add_class_3;
  statx_timestamp* tmp_add_class_4;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/N7fGvszWQb/dump1.h"