Temporary header file '/tmp/U_me1RuS4O/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/nbdkit-common.h"
  #include "/usr/include/nbdkit-filter.h"
  #include "/usr/include/nbdkit-plugin.h"
  #include "/usr/include/nbdkit-version.h"

  // add classes
  cmsghdr* tmp_add_class_0;
  iovec* tmp_add_class_1;
  linger* tmp_add_class_2;
  mmsghdr* tmp_add_class_3;
  msghdr* tmp_add_class_4;
  nbdkit_export* tmp_add_class_5;
  nbdkit_extent* tmp_add_class_6;
  nbdkit_filter* tmp_add_class_7;
  nbdkit_next_ops* tmp_add_class_8;
  nbdkit_plugin* tmp_add_class_9;
  osockaddr* tmp_add_class_10;
  sockaddr* tmp_add_class_11;
  sockaddr_storage* tmp_add_class_12;
  ucred* tmp_add_class_13;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/U_me1RuS4O/dump1.h"

In file included from /tmp/U_me1RuS4O/dump1.h:12:
/usr/include/nbdkit-common.h:37:2: error: #error this header file should not be directly included
   37 | #error this header file should not be directly included
      |  ^~~~~
In file included from /usr/include/nbdkit-common.h:51:
/usr/include/nbdkit-version.h:37:2: error: #error this header file should not be directly included
   37 | #error this header file should not be directly included
      |  ^~~~~