Temporary header file '/tmp/KWhw8lV42q/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/avcall.h"
  #include "/usr/include/callback.h"
  #include "/usr/include/ffcall-abi.h"
  #include "/usr/include/ffcall-version.h"
  #include "/usr/include/trampoline.h"
  #include "/usr/include/vacall.h"
  #include "/usr/include/vacall_r.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/KWhw8lV42q/dump1.h"

In file included from /tmp/KWhw8lV42q/dump1.h:17:
/usr/include/vacall.h:67:6: error: multiple definition of ‘enum __VAtype’
   67 | enum __VAtype
      |      ^~~~~~~~
In file included from /usr/include/callback.h:24,
                 from /tmp/KWhw8lV42q/dump1.h:13:
/usr/include/vacall_r.h:106:6: note: previous definition here
  106 | enum __VAtype
      |      ^~~~~~~~
/usr/include/vacall.h:87:6: error: multiple definition of ‘enum __VA_alist_flags’
   87 | enum __VA_alist_flags
      |      ^~~~~~~~~~~~~~~~
/usr/include/vacall_r.h:126:6: note: previous definition here
  126 | enum __VA_alist_flags
      |      ^~~~~~~~~~~~~~~~