Temporary header file '/tmp/hJSn_NLGsL/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _TIME_BITS 64
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
typedef float _Float32;
typedef long double _Float64;
typedef double _Float32x;

  // add includes
  #include "/usr/include/btrfs/ctree.h"
  #include "/usr/include/btrfs/ioctl.h"
  #include "/usr/include/btrfs/kerncompat.h"
  #include "/usr/include/btrfs/list.h"
  #include "/usr/include/btrfs/rbtree.h"
  #include "/usr/include/btrfs/rbtree_types.h"
  #include "/usr/include/btrfs/send-stream.h"
  #include "/usr/include/btrfs/send-utils.h"
  #include "/usr/include/btrfs/send.h"
  #include "/usr/include/btrfs/version.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -U__cplusplus -D_Bool="bool" -x c++ -fpermissive -w "/tmp/hJSn_NLGsL/dump1.h"