Temporary header file '/tmp/ElfnvzSprN/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/AttributeFeature.h"
  #include "/usr/include/HepMC3/Feature.h"
  #include "/usr/include/HepMC3/Filter.h"
  #include "/usr/include/HepMC3/FilterAttribute.h"
  #include "/usr/include/HepMC3/Relatives.h"
  #include "/usr/include/HepMC3/Selector.h"

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

In file included from /tmp/ElfnvzSprN/dump1.h:12:
/usr/include/HepMC3/AttributeFeature.h:15:10: fatal error: HepMC3/Attribute.h: No such file or directory
   15 | #include "HepMC3/Attribute.h"
      |          ^~~~~~~~~~~~~~~~~~~~
compilation terminated.